Since the only change I've made to my machine was the installation of CCleaner, it appears Avast AV installation file may have piggybacked on the CCleaner 3.34 (32-bit) download as the date and time of the installation are nearly identical. When I initiated a reboot – unrelated to the new CCleaner update since it's not required – Avast anti-virus software was automatically (and mysteriously) installed after the reboot. Last Tuesday (Sept 12), I downloaded the most recent version of the 32-bit CCleaner (v5.34) on a Windows 7 (32-bit) machine. Interesting news about CCleaner, which makes me wonder after an incident that occurred recently. Further details may be found at the report from Cisco Talos and at Bleeping Computer. AVAST intends to add a new signature to its antivirus scanners and will inform affected users.
AVAST says, that 3 % of all CCleaner installs are effected – but this are 2.27 million affected machines. Newer versions of CCleaner are free of malware. The malware has been found in CCleaner version and CCleaner Cloud Version. According to the blog post, only 32 bit Windows version has been affected. Piriform has confirmed this incident today within a blog post. The installer was signed with a valid certificate. Talos assumes that the server through which the CCleaner installer was distributed was compromised. This happened from Augwith CCleaner 5.33 and from Augwith CCleaner Cloud 1.07. The malware then retrieved additional code from the malware server and transmitted data such as the IP address, computer name, installed software and existing network adapters to a server in the USA. This was published by a new report vom Cisco Talos. and Septemhas been delivered with an infected Floxif malware installer. Some versions of CCleaner app, downloaded between August 15. Some time ago, CCleaner was taken over by the Czech security company AVAST. This free system cleaner for Windows is often used by many users. My credo is: keep your fingers off to system cleaners – but many users swear at CCleaner from Piriform.
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