![]() 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. In that case, as in the CCleaner attack, victims installed seemingly legitimate software from a small but trusted company, only to find that it had been silently corrupted, deeply infecting their IT systems.July 3 - Evidence suggests hackers breached Piriform's IT systems. ![]() Two months earlier, hackers hijacked the update mechanism of the Ukrainian accounting software MeDoc to deliver a destructive piece of software known as NotPetya, causing massive damage to companies in Ukraine as well as in Europe and the United States. But it already represents another serious example in the string of software supply-chain attacks that have recently rocked the internet. The exact dimensions of the CCleaner attack will likely continue to be redrawn, as analysis continues. "If you didn’t restore your system from backup, you’re at high risk of not having cleaned this up," Williams says. Instead, the researchers recommend that anyone affected fully restore their machines from backup versions prior to the installation of Avast's tainted security program. On Wednesday, researchers at Cisco's Talos security division revealed that they've now analyzed the hackers' "command-and-control" server to which those malicious versions of CCleaner connected.įor any company that may have had computers running the corrupted version of CCleaner on their network, Cisco warns that its findings mean merely deleting that application is no guarantee the CCleaner backdoor wasn't used to plant a secondary piece of malware on their network, one with its own, still-active command and control server. It wound up installed on more than 700,000 computers. Researchers now believe that the hackers behind it were bent not only on mass infections, but on targeted espionage that tried to gain access to the networks of at least 18 tech firms.Įarlier this week, security firms Morphisec and Cisco revealed that CCleaner, a piece of security software distributed by Czech company Avast, had been hijacked by hackers and loaded with a backdoor that evaded the company's security checks. But now it's becoming clear exactly how bad the results of the recent CCleaner malware outbreak may be. Hundreds of thousands of computers getting penetrated by a corrupted version of an ultra-common piece of security software was never going to end well. Update: On September 25, Avast confirmed that of the 18 companies targeted, a total of 40 computers were successfully infected with a secondary malware installation at the following companies: Samsung, Sony, Asus, Intel, VMWare, O2, Singtel, Gauselmann, Dyn, Chunghwa and Fujitsu.
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