A [question on programmers.se](https://softwareengineering.stackexchange.com/questions/38976/in-what-situations-would-it-be-technically-impossible-to-release-a-system-as-op/) got me wondering: has anybody released an open source virus? Of course I'm just wondering out of sheer curiosity of what a virus's source code might look like. A quick google search shows that there are plenty of open source *antivirus* programs, but I didn't see any open source viruses.