![]() ![]() “…it is likely that an external attacker compromised a portion of their development or build environment and leveraged that access to insert malware into the CCleaner build that was released and hosted by the organization. What make things most concerning is that the malicious code was digitally signed using a valid digital certificate issued to the software’s developer Piriform, who were acquired by anti-virus firm Avast just two months ago.Ĭisco Talos researchers warn that the fact the binary was digitally signed using the software developer’s valid certificate is of particular concern: Researchers at Cisco Talos, who first identified the problem, discovered that the installer for CCleaner v5.33 – first delivered to users’ computers by the legitimate CCleaner download servers on Aug– was the culprit. The stolen data was then sent to a US-based server under the control of a hacker. Once in place, the malware would wait five minutes, determine if the user had admin privileges, and then steal information from PCs, such as the computer’s name, a list of installed software and Windows updates, running processes, MAC addresses of network adapters alongside additional information. ![]() As a security notification on CCleaner’s support forum explains, CCleaner v and CCleaner Cloud v were compromised. ![]()
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