It's believed more than 2 million users were infected. Initially, the company believed it was confined to the above versions running on a 32-bit Windows systems and that downloading upgraded versions of the program would solve the problem. It's believed the hackers compromised CCleaner's build environment to insert the malware.Īccording to different reports, the malware is capable of collecting specific data from an infected computer system, including IP addresses and information on installed and active software, and sending it to a third-party server located in the United States.ĬCleaner's parent company, Avast Piriform, found the malware on September 12, 2017, and immediately took steps to remediate the problem. The malware consisted of two Trojans, Trojan.Floxif and Trojan.Nyetya, inserted into the free versions of CCleaner version and CCleaner Cloud version. They turned a tool meant to scrub your computer clean of lurking malware into a serious threat to sensitive and personal information.

Hackers took the legitimate program and inserted malicious code that was designed to steal data from users. However, in September 2017, CCleaner malware was discovered. In January 2017, CNET gave the program a 'Very Good' rating.

During the cleanup, malicious files buried in the system are also deleted. The software gets rid of temporary files that eat up disk space and invalid Windows registry keys. CCleaner is a utility program designed to delete unwanted files from a computer.

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