Even if you were monitoring all outbound communication, you most likely would have allowed it since the process was running from the CCleaner directory. This is also "iffy" since the CCleaner updater most likely created a new process most like likely in its own directory and used that process to perform the remote communication. By "aggressive" I mean that CCleaner would be only allowed to connect its known update servers and nothing else. One way this could have been user detected was through aggressive outbound network monitoring. This is "point proof" that the Next Gen/AI algorithms are also totally ineffective against this. No one detected the malware prior to its discovery in mid-Aug and subsequent public disclosure earlier this week. The backdoor was a validity signed executable in a trusted software update download. I could understand that zero day did not recognize the threat, but please, was active almost a month and no one else noticed, or who knows how many months they would have taken to do so. The reality of the situation is no one knows for sure what system modification occurred through use of the backdoor in the month or more it was resident on one's device. There are currently a lot of users, based on posted comments in the security forums, who believe they are now safe since security solutions are detecting and removing the original backdoor. Case in point was the EternalBlue set backdoor and later delivered malware that used that backdoor and closed it so no one else could use it. Once activated not only can the original hacker use it but so can anyone else. My statement is a backdoor is a backdoor. Avast in my opinion is spreading FUD by their statement that the second stage of the backdoor never activated therefore no actual malware payload was downloaded. Would be helpful if Eset published an article on recommended mitigation to anyone affected this.Ĭisco already publically stated restore prior to Aug. The latest version is available for download here.As only two smaller distribution products (the 32 bit and cloud versions, Windows only) were compromised, the actual number of users affected by this incident was 2.27M. ![]() However, Piriform estimated that up to 3 percent of its users (up to 2.27 million people) were affected by the malicious installation.Īffected users are strongly recommended to update their CCleaner software to version 5.34 or higher, in order to protect their computers from being compromised. CCleaner claims to have over 2 billion downloads worldwide as of November 2016 and is reportedly adding new users at a rate of 5 million a week,” Talos said. CCleaner, the popular file clean-up and performance optimization utility for Windows, has been hacked to spread malware to users of the 32-bit version. “The impact of this attack could be severe given the extremely high number of systems possibly affected. Additional information like whether the process is running with admin privileges and whether it is a 64-bit system.Īccording to the Talos researchers, around 5 million people download CCleaner (or Crap Cleaner) each week, which indicates that more than 20 Million people could have been infected with the malicious version the app.List of installed software, including Windows updates.With over 20 million downloads per month, and the updates, that is a high number of PCs that have been affected by this. The malicious software was programmed to collect a large number of user data, including: The compromised versions of CCleaner and CCleaner Cloud were distributed for nearly a month.
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