Ccleaner malware in avast12/22/2023 ![]() The company also wanted to stress that the compromise occurred before Avast bought Piriform, and following the incident, Avast migrated Piriform's build environment onto Avast's internal IT system. In the updated statement released today, Avast CEO Vince Steckler and CTO Ondřej Vlček, say that number has now gone down to 730,000 as users removed or updated their CCleaner installations. In an email to Bleeping Computer yesterday, Avast CTO Ondřej Vlček said that telemetry data suggested that over 2.27 million computers were running the two compromised CCleaner versions. ![]() Number of affected users goes down from 2.27 million to 730,000 September 18 - CCleaner incident becomes public following Cisco, Morphisec, and Avast/Piriform reports. September 15 - Avast releases CCleaner 5.34 and CCleaner Cloud that remove the Floxif malware. September 15 - Following a collaboration between Avast and law enforcement, the malware's C&C server was taken down. September ? - Cisco had registered, in the meantime, all the domains that the malware would have used in the future to determine and calculate the C&C server IP address. September 14 - Cisco notifies Avast of its own findings. Avast starts its own investigation and also notifies US law enforcement. September 12 - Morphisec notifies Avast and Cisco of the suspicious CCleaner activity. September 11 - Morphisec customers share detection logs detailing CCleaner-related malicious activity with the company's engineers. The CCleaner installer included the Floxif trojan, but the malware executed only on 32-bit systems.Īugust 20 and 21 - Morphisec's security product detects first instances of malicious activity (malware was collecting device details and sending the data to a remote server), but Morphisec does not notify Avast.Īugust 24 - Piriform releases CCleaner Cloud v that also includes the Floxif trojan. July 18 - Avast decides to buy Piriform, the company behind CCleaner.Īugust 15 - Piriform, now part of Avast, releases CCleaner 5.33. July 3 - Evidence suggests hackers breached Piriform's IT systems.
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