Avast yesterday released an update that caused its antivirus software
to report scores of clean, legitimate software programs as being riddled with malware.
According to a blog post by the company, the bad false positive issue came about following an update sent out around 00:15 GMT "which started flagging hundreds of innocent files as a 'Win32
elf-MZG' Trojan (or, in less common cases, as 'Win32:Zbot-MKK')."
According to reports, a range of files from widely used and custom applications as well as device drivers and system files all fell foul of the erroneous update.
After complaints came pouring in, the company found and repaired the problem and around six hours later, at 05:50 GMT it sent out another VPS update which corrected the issue. But by then the damage had already been done to a host of users, with crucial files having been quarantined or deleted.
"We were inundated with calls from customers who had had Omni files quarantined and subsequently deleted," said Chris Kudla, lead developer for business
accounting software firm Omni Accounts.
More................Avast update fixes false positives - The Inquirer