![]() However, CCleaner is also built into some versions of Avast antivirus software, in which it is automatically updated. The free version of CCleaner must be manually updated. While CCleaner is a very popular application, claiming 5 million downloads per week, this infected version would not have hit all of those users. Yung notes that that Piriform is updating all versions of its software up to non-malicious versions, but users can download a new copy here. ![]() Those without the option to restore a backup should check if their CCleaner is 5.33. At the very least, make sure your own anti-virus software is up to date. 15, as your system may have been compromised since then. If you're on version 5.33 of CCleaner, which states its version number in its top left corner of its interface, your best bet may be to roll back your Windows system to a snapshot from before Aug. This data transfer from CCleaner appeared to be the malware, identified as Floxif, phoning home to its command-and-control servers. 12, which led to Piriform taking the server down. In a blog post from Paul Yung, VP of Products for Piriform, the exec noted that his company saw suspicious activity from "unknown IP address receiving data from software found in version of CCleaner" on Sept. Before that, though, Piriform already knew something fishy was going on. MORE: Best Antivirus Protection for PC, Mac and AndroidĪ report on this attack from technology company Cisco's Talos Intelligence blog notes that infected versions of CCleaner were observed "as recently as September 11," and that they alerted Avast of the issue on September 13. Following either (or both) of those steps, visit Piriform's site to download and install the latest, clean version of CCleaner. 15 snapshot of your system, or run a malware scan. 15 and you're running 32-bit Windows, you may be infected. In July of this year, Piriform was acquired by the Prague-based antivirus maker Avast. Those servers belonged to Piriform, the London company that created CCleaner. The attack took place by piggy-backing onto CCleaner by infiltrating the servers that distribute the software, infecting version 5.33 of the Windows utility and version 1.07 of its cloud-based sister application. ![]()
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