For over five hours Friday, McAfee's anti-virus software erroneously flagged hundreds of legitimate executables as a malicious virus, leading some customers to quarantine or delete the offending files and render applications such as Microsoft Excel inoperative.
An error in McAfee's daily virus definition file (dubbed "DAT") identified the files as W95/CTX, a virus first discovered in 2004. All editions of McAfee's on-demand-scanning products, including both the enterprise and consumer versions of VirusScan, were affected.
Among the legitimate files painted as malware were Microsoft's Excel spreadsheet, Adobe's Flash, the Google Toolbar installer, several Adaptec drivers, and parts of Sun Microsystems' Java Runtime Environment. The list that McAfee posted of the affected files numbers more than 330, but even so, the SANS Institute's Internet Storm Center called it incomplete.
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http://www.crime-research.org/news/14.03.2006/1880/
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