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False positive

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The term false positive is used when antivirus software wrongly classifies an innocuous file as malware. The incorrect detection may be due to heuristics or to an incorrect virus signature in a database. Similar problems can occur with antispyware software.

On November 10, 2008, an update issued by AVG incorrectly identified user32.dll as being infected with either Trojan PSW.Banker4.APSA or Trojan Generic9TBN on Windows XP SP2 and SP3 (it did not affect Windows 2000 and Vista). When users clicked on the Heal or Move to Vault button will bring up a Blue Screen of Death with stop c0000135 (Unable To Locate Component). Everytime users rebooted their machine, the same BSOD will appear because of the deleted file.[1] A fix has been provided by AVG.[2]


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