"The attack affected a total of 2.27 million computers between August 15, 2017, and September 15, 2017, and used the popular PC cleaning software CCleaner version as a distribution vehicle," Avast CEO Vince Steckler and Ondřej Vlček, executive vice president and general manager of Avast's consumer business, write in a Thursday update on the CCleaner investigation.Ĭisco's Talos security wing says that 700,000 systems were infected with a trojanized version of CCleaner, which relayed details of compromised machines to attackers. 12, via cybersecurity software firm Morphisec. The security firm says it first learned of the attack on Sept. It says hackers broke into a download server and substituted a malicious version of the CCleaner installer. See Also: Live Webinar | Unmasking Pegasus: Understand the Threat & Strengthen Your Digital DefenseĬzech company Avast, one of the world's largest security vendors, bought Piriform earlier this year. Avast's CCleaner PC cleaning utility, developed by Piriform, is marketed to consumers and businesses.Īn attack campaign involving a trojanized version of the CCleaner Windows utility, built and distributed by British developer Piriform, was much more extensive than it first appeared (see Avast Distributed Trojanized CCleaner Windows Utility).
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