![]() RELATED: The Ultimate Checklist Guide to Reinstalling Windows on Your PCĪlternatively, they say, you can reinstall Windows completely-yes, it’s a bit of a nuclear option, but it’s the only way to completely know your system is clean after an event like this.Piriform, owned by security firm Avast, has warned users of its popular CCleaner utility that a breach had it distributing a backdoor Trojan Horse for up to a month - affecting an estimated 2.27 million users. You should probably run an antivirus and MalwareBytes scan on your system and your backups to ensure no malware is left installed. While nothing immediately harmful was discovered, Cisco Talos recommends restoring your system to a state before Augfrom a backup if you were affected. If that key exists, it means you had the infected software on your system at one point in time.) What Should I Do? (If you’re comfortable going into the registry, you can open Registry Editor and navigate to HKLM\SOFTWARE\Piriform and see if there is a key labeled Agomo:MUID. ![]() If that version is 5.34 or later, your current version isn’t affected, but if you updated CCleaner in between August 15th and September 12th, and are on a 32-bit system, you may still have been affected. If that version is before version , then you are not affected, and you should manually download the latest version now. Open CCleaner and look in the top-left corner of the window-you should see a version number under the program name. If you are on a 32-bit version of Windows and think you might have downloaded CCleaner during the affected timeframe, here’s how to check what version you have. ( Update: A few days after this news broke, a second payload was discovered that affected 64-bit users-but it was a targeted attack against tech companies, so it’s unlikely most home users were affected.) Since many users likely use the 64-bit version of the application, and CCleaner Free does not automatically update, this is good news for a lot of people.
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