This proof-of-concept DTC exploit appears to be reverse engineered from the October updates. As this critical vulnerability impacts communications security, it could be potentially crafted into a new Internet worm, based on some reports I've read. Please be sure you are up-to-date on all Microsoft Windows updates (esp. through October 2005).

Microsoft Windows Distributed Transaction Coordinator Remote Exploit (MS05-051)
Please be careful as this link contains actual exploit code below:
http://www.frsirt.com/exploits/20051127.55k7-msdtc.c.php