Published Aug 18, 2005 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: W32.Bobax (Symantec) W32/Bobax (Sophos)


Windows Defender Antivirus detects and removes this threat.
Win32/Bobax is a family of mass-mailing network worms that target certain versions of Microsoft Windows.
The worm can spread by sending a copy of itself as an attachment to email addresses gathered from an infected computer. It can also spread by exploiting several Windows vulnerabilities. The worm can download and run malicious files from Web sites, and can also open a backdoor to give attackers access to use the infected computer.

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find hidden malware.

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

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