CCleaner Hacked Infecting Millions with Backdoor Malware

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Hackers compromised CCleaner in a sophisticated attack that affected over 2 million computers, security researchers and Piriform confirmed Monday.

Cisco's Talos security group said the affected version of CCleaner was available on Piriform's website from 15 August to 12 September, or almost one month.

According to the Cisco Talos researchers, the 32-bit version of the v5.33.6162 of CCleaner and the v1.07.3191 of CCleaner Cloud contained a multi-stage malware payload that rode on top of the installation during the period between August 15 and September 12. This is an unusual attack as antivirus software is trusted by consumers and meant to protect against this type of malware.

Despite the release of updated versions of the compromised software, the Cisco Talos research team is advising all those who downloaded the compromised versions of CCleaner to wipe their computers.

An instance of a backdoored CCleaner version has been first flagged by Cisco, while customer beta testing their new exploit detection technology. When the Petya/NotPetya malware infected computers across Ukraine and the world in July, it was spread by an infected piece of software.

"Working with USA law enforcement, we caused this server to be shut down on the 15th of September before any known harm was done", said the company in the announcement.

"The compromise could cause the transmission of non-sensitive a 3rd party computer server in the US", the company said. CCleaner is free software that can improve the performance of a computer.

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Piriform told users a booby-trapped version of its CCleaner software had been made available in August and September.

The regular and cloud-based versions of CCleaner, which has been downloaded over 2 billion time worldwide as of November 2016 and adds about 5 million new users a week, have since been patched and the US-based server to which the malicious code sent system information has been shut down.

The impact of the infection had been limited, said Mr Yung, because relatively few people automatically updated the CCleaner software.

Also, if you updated your CCleaner software during that nearly month-long block of time, things are not looking good. CCleaner users need to install version 5.34 or higher. Piriform, perhaps unsurprisingly, says everything is taken care of and you can just update and chill.

"At this stage, we don't want to speculate how the unauthorized code appeared in the CCleaner software, where the attack originated from, how long it was being prepared and who stood behind it", he said.

He apologised for any inconvenience that had been caused and said the company's investigation into the attack was "ongoing".

The Cisco Talos researchers recommended that affected systems - of which there could be thousands - should be restored to a state before August 15 2017 or reinstalled.

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