![]() How popular is CCleaner? According to its developer Piriform (owned by Avast), CCleaner has 2 billion downloads so far, with 5 million extra downloads per week.Īccording to the investigation, the hacked version with the malicious backdoor was available as far back as September 11 and may affect as much as 2.7 million users. “For a period of time, the legitimate signed version of CCleaner 5.33 being distributed by Avast also contained a multi-stage malware payload that rode on top of the installation of CCleaner,” revealed the Talos researchers. The modified version can send the infected computer’s name, installed software and running applications to the attacker’s server and in turn, can install further malicious programs like ransomware or keyloggers. Security researchers at Cisco Talos recently discovered that the download servers for popular Windows cleaning tool CCleaner were broken into by hackers and they modified the CCleaner software to distribute malware. However, if you’ve downloaded or updated this version of the program recently, you may be unwittingly infecting your computer with malware. We are working on responses for many of your other questions and will update you as soon as we are able.Have you downloaded this free Windows cleaning tool lately? It is one of the best programs out there for clearing out your browser cookies, trackers, internet history, download history, cache and individual browser session activity. In addition to Cisco and MalwareBytes, Windows Defender also refers to this malware as 'Floxif'. Bleeping Computer published one of the earliest articles on the incident and their article was fastest trending on Reddit. The screenshot shows the malware was detected as ''. The reason many people refer to this as 'Floxif' is because Cisco Talos researchers updated their ClamAV software to detect the malware in CCleaner and took a screenshot of this detection before publishing their article. Kaspersky calls it "", Avast calls it "Win32:TlsHack-A "). Various antivirus solutions will detect CCleaner v under other names (e.g. This term goes back to 2009 and is not used ubiquitously by all threat researchers. 'Trojan.Floxif' is a term given to a group of malware that uses Windows executable and DLL files to infect a system and then download additional malicious files. MalwareBytes later changed this definition to 'Trojan.Floxif'. The malware that was injected into the CCleaner v 32-bit binary is completely unrelated and does not behave like Nyetya. Separately, on the day the security vulnerability was disclosed, Malwarebytes initially detected v of ccleaner.exe as 'Trojan.Nyetya'. In their first blogpost on the CCleaner malware investigation, Talos reference Nyetya as an example of "how potent can be". Nyetya was discovered in late June 2017 by the Talos research team (Cisco) and was delivered via Ukrainian accounting software called M.E.Doc. Nyetya is a type of malware completely unrelated to the malware seen in CCleaner v. Are they the same malware with different names or totally different? Apparently, the ccleaner attack resulted in two found malwares, Nyetya and Floxif. My apologies if these questions have already been covered. If you somehow managed to keep CCleaner.exe open instead of CCleaner64.exe (which does not normally happen, probably could if you first deleted CCleaner64.exe) you would surely be both infected and affected by the infection. After that, the file that really runs and works is the not-infected CCleaner64.exe. It just runs for a little while (or not at all, depending on your UAC configuration), perhaps not enough for the virus to execute? - I'm sorry this is the part I got no answer to, despite of asking. They were not, because the infected file CCleaner.exe does not normally run on 64 systems. The thing is, 64 bit systems were not affected by the infection (allegedly, as I have not seen official confirmation or better yet - an explanation). I think it depends on how you define "infection", because, technically anyone using v5.33 was infected. Were there any cases of infection of 64-bit computers or not? If so, under what conditions 64-bit computers could infect? Question for administrators or people close to the topic:
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