12/13: Janx Worm Exploits Windows Flaw
December 13, 2004

W32.Janx is a worm that attempts to exploit the Microsoft Windows LSASS Buffer Overrun Vulnerability (Microsoft Security Bulletin MS04-011). The worm spreads by randomly scanning IP addresses for vulnerable systems. The worm also connects to an IRC server and waits for commands.

Technical details can be found at Symantec page.