Malicious Software Removal Tool
This tool works only on Microsoft Windows XP, Windows 2000, and Windows Server 2003.
Microsoft releases an updated version of this tool on the second Tuesday of each month, and as needed to respond to security incidents. You can run the tool from this Web page anytime or download it to your computer. 
Alcan.B is circa June, 2005. MS’s anti-malware technology team has blogged that “In February’s release of the tool (MS’s Windows Malicious Software Removal Tool), we added the ability to detect and remove a worm called Win32/Alcan.”. So seven months and a few days after information about Alcan.B was first published, MS’s Anti-Malware Engineering Team is “genuinely surprised” that 250,000 of the 250 million computers systems that ran the February Windows Malicious Software Removal Tool were infected with Alcan.B. 
[1.] Malicious Software Removal Tool [MS]