CCleaner unknowingly distributed malware to Windows PCs for one month

Piriform, the firm behind "CCleaner," has announced that malware was distributed by the application for nearly one month.

It has been revealed that CCleaner, a popular application for file clean-up and performance optimization suffered a "security incident" last month, which resulted in malware being unknowingly distributed for four weeks.

Announced today in a blog post from the program's developer, Piriform, 32-bit versions of CCleaner 5.33.6162 and CCleaner Cloud 1.07.3191 distributed malicious software, between August 15 and September 12. After being notified of the issue by Cisco Talos, the firm prevented any further downloads of these versions, while pushing out an automatic update to affected users.

Alongside a download of these versions of CCleaner, users unknowingly installed the software, which was slipped into the installer and distributed through official servers. The malware sent various encrypted information from affected PCs to attackers, including PC names, installed and running software, Windows updates and MAC addresses of network adapters.

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