This was pretty rare for the most popular AVs, but if it didn't work I would try manually zeroing different sections until I found something. I was surprised ho

This was pretty rare for the most popular AVs, but if it didn't work I would try manually zeroing different sections until I found something. I was surprised how easy it was to make a virus undetected, and that they didn't routinely change their fingerprint algorithm as a defense against this attack.