Security researchers from AVG were decompiling a trojan — it had been originally posted to a Diablo III forum, masquerading as a how-to video — when the malware’s author popped up in a window on their screen. It turned out that the trojan had a built-in chat, as well as a screen-capture facility. The hacker who wrote the malware saw them working on defeating her or his virus and decided to tell them off for their audacity. Franklin Zhao and Jason Zhou, the AVG researchers, wrote up their experience:

via Malware author taunts security researchers with built-in chat – Boing Boing.