![]() No documented instances of second stage payload activation have been reported at this time. This could be the work of adware (and its friends), a sneaky variant of malware that is hard to find, and harder to remove. The hardcoded C2 server is currently unreachable and the fallback DGA domains are not controlled by the attacker. A hacker managed to infiltrate the official build of CCleaner during the development process to design malware to steal user data. Update CCleaner to version 5.34 and CCleaner Cloud to version. Versions prior to 5.33 are not affected, and version 5.34 has been released to remove the malicious code.Ĭonduct anti-virus/anti-malware scans on any machines where CCleaner is known to be installed. But its developers rolled out iterations for macOS and Android in 20, respectively. It started out as an optimization tool for PCs. It has been around since 2004, garnering countless glowing CCleaner reviews for the most part of its history. The back door was introduced via a supply chain compromise that allowed the attacker to insert malicious code into a legitimate installer file from the official Piriform servers. What Is CCleaner CCleaner is a piece of scrubbing software originally developed by Piriform. ![]() ![]() CCleaner is a legitimate Windows cleanup utility distributed by Piriform, a company owned by the antivirus vendor Avast. CCleaner v4 () Version 6.04 brings various usability improvements to CCleaner. Security researchers have identified a two-stage back door embedded in CCleaner and CCleaner Cloud version (32-bit only for both versions). A backdoor found in CCleaner shows cybercriminals will continue to invent new ways to access user data like putting malware into official software builds.
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