The only way to be certain that your system or LAN is not infected is to run an up-to-date scanner. Symantec, for example, offers a tool to locate and remove Bugbear, as well as instructions on how to perform this check safely.
For more information on this topic, visit these other SearchSecurity.com resources:
Featured Topic: Bugbear
Virus Prevention Tip: Cleaning out a virus infection
Best Web Links: Malware
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