September 13, 2017-Researchers at Cisco Talos detected the malicious version of the software, which was being distributed through the company's official website for more than a month, and notified Avast immediately. July 18, 2017-Security company Avast acquired Piriform, the UK-based software development company behind CCleaner with more than 2 billion downloads.Īugust 2, 2017-Attackers replaced the original version of CCleaner software from its official website with their backdoored version of CCleaner, which was distributed to millions of users. NET runtime library).īetween mid-April and July-During this period, the attackers prepared the malicious version of CCleaner, and tried to infiltrate other computers in the internal network by installing a keylogger on already compromised systems to steal credentials, and logging in with administrative privileges through RDP.

April 12, 2017-A few days later, attackers installed the 3rd stage payload on four computers in the Piriform network (as a mscoree.dll library) and a build server (as a.

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