Belgian virus writer (female) who has once written a virus in Tcl. But who is now in the spotlight because of a C# virus. Her homepage from where you could download the virus seems to be down but it still shows up in the google cache.
From the site: [L1 ] - November 10, 2003: I wanted to learn a scripting language I could use in Linux, and decided to learn Tcl. So how did I start learning? That's right, I wrote a virus in it. Was quite simple tho, seeing as it's a scripting language. Its name is Darkness, and you can download it here.