A former "friend" of mine in high school deleted my documents including due school work with netbus or BO (don't remember which one). It really was a shitty thing to do and he was proud of it that I lost weeks of work.
I got revenge couple of months later with a "screensaver" that I've made in Delphi. In reality it would just "crash" with some random error, but actually copy itself on multiple places on the hard drive with windows sounding names, run both as a service and some innocent sounding files etc. It wouldn't show up in task manager. I could send and execute whatever commands I liked. I've deleted his Diablo saves a week later or so, and man he was livid as he wasted months playing. He had no idea what happened as he had two AV programs installed and he was confident it would detect a trojan.
Windows security at that period of time really was a contradiction in terms.
I got revenge couple of months later with a "screensaver" that I've made in Delphi. In reality it would just "crash" with some random error, but actually copy itself on multiple places on the hard drive with windows sounding names, run both as a service and some innocent sounding files etc. It wouldn't show up in task manager. I could send and execute whatever commands I liked. I've deleted his Diablo saves a week later or so, and man he was livid as he wasted months playing. He had no idea what happened as he had two AV programs installed and he was confident it would detect a trojan.
Windows security at that period of time really was a contradiction in terms.