We all make mistakes and software engineers are only human. In antivirus programs, those mistakes can sometimes result in the loss of email and/or the deletion of important system files. Following are the six most memorable antivirus mistakes (all of which have since been fixed).
As email worms became more prevalent in the early part of 2001, certain versions of McAfee VirusScan blocked any email that simply mentioned the name of a particular email worm. This text-based detection prevented alerts from other vendors and the media from getting through to recipients.
In May 2003, a false positive in Trend Micro's InterScan eManager and ScanMail eManager resulted in those products quarantining any email that contained the letter "p".
In November 2006, Microsoft's Windows Live OneCare claimed that Gmail's default mail.htm was malware, idenfifying it as BAT/BWG.A and preventing access to affected users' Gmail accounts.
In December 2007, signature updates for Kaspersky Anti-Virus versions 6.0 and 7.0 and Kaspersky Internet Security 6.0 and 7.0 began erroneously detecting Worm.Win32.huhk.c in a particular version of Windows Explorer (explorer.exe).
In March 2007, Microsoft's Windows Live OneCare deleted users' Outlook .pst files. Not a false positive per se, the deletion occurred when OneCare detected an infected email and either quarantined or deleted the entire .pst file as a result.
In March 2009, Microsoft's Windows Defender detected the default localhost entry (127.0.0.1) in the Windows HOSTS file as being Win32/PossibleHostsFileHijack - and subsequently deleted the entry.
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