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MSDOS/Virus.MSDOS.Unknown.rnd.asm

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+
+; A pseudo random numbers generator
+;  for use with the MuTation Engine <tm>
+
+; Version 1.01 (26-10-91)
+; (C) 1991 CrazySoft, Inc.
+
+	.model	tiny
+	.code
+
+	public	rnd_init, rnd_get, rnd_buf, data_top
+
+rnd_init:
+	push	ds si dx cx bx
+	xor	ah,ah
+	int	1ah
+	in	al,[40h]
+	mov	ah,al
+	in	al,[40h]
+	xor	ax,cx
+	xor	dx,ax
+	push	cs
+	pop	ds
+	mov	si,offset rnd_buf
+	xor	bh,bh
+	jmp	short rnd_put
+rnd_get:
+	push	ds si dx cx bx
+	push	cs
+	pop	ds
+	mov	si,offset rnd_buf
+	mov	bl,[si]
+	xor	bh,bh
+	mov	ax,[bx+si+2]
+	mov	dx,[bx+si+4]
+	add	byte ptr [si],4
+	mov	cx,7
+rnd_lup:
+	shl	ax,1
+	rcl	dx,1
+	mov	bl,al
+	xor	bl,dh
+	jns	nxt_bit
+	inc	al
+nxt_bit:
+	loop	rnd_lup
+rnd_put:
+	mov	bl,[si+1]
+	mov	[bx+si+2],ax
+	mov	[bx+si+4],dx
+	add	bl,4
+	mov	[si+1],bl
+	mov	al,dl
+	cmp	bl,[si]
+	jnz	rnd_done
+	add	byte ptr [si],4
+rnd_done:
+	pop	bx cx dx si ds
+	ret
+
+	.data
+
+rnd_buf dw	129 dup(?)
+
+data_top:
+
+	end
+