“We have no indications that any other data has been sent to the server. That data includes the user’s computer name, IP address, a comprehensive list of installed software on their machine, a list of active software, and list of network adapters. Hackers appear to have used the malware to harvest what the firm describes as “non-sensitive” data. So far Piriform has been able to ascertain that the malware was communicating with a Command and Control (CnC) server located in the US. We also immediately contacted law enforcement units and worked with them on resolving the issue.” 'Non Sensitive' Data Stolen “We found that the version of CCleaner and the version of CCleaner Cloud was illegally modified before it was released to the public, and we started an investigation process. It is not yet known how hackers managed to hide the malevolent code within the official version of CCleaner. However, other CCleaner users may still be running the compromised version, so updating manually is extremely important for those consumers. It is worth noting that users of CCleaner Cloud will have received the update automatically. Piriform is urging all CCleaner users to download version 5.34 or higher as soon as possible. Piriform says that the versions of its software that were compromised are CCleaner and CCleaner Cloud. Since then, research from Cisco has revealed that the true number of infections is lower, at around 700,000 PCs.Īccording to the blog post by Piriform, infected copies of CCleaner were disseminated between 15 August and 12 September.

Since the story first broke, the computer security firm Avast has announced that up to 2.27 million CCleaner users may have been affected by the malware that was hidden within official versions of the popular PC performance optimization software. The good news is that only people running the CCleaner on 32-bit Windows systems were affected. The revelation first hit the web on Monday morning, when the software’s developer Piriform published a blog post on the subject. News has emerged that an infected version of the popular PC and Android optimization software CCleaner has been spreading malware to large numbers of computer users.

Ccleaner piriform malware