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By exploiting the trust relationship between software vendors and the users of their software, attackers can benefit from users' inherent trust in the files and web servers used to distribute updates.'Īvast chief technology officer Ondrej Vlcek said there was, however, little reason to panic. In its blog, Talos' researchers concluded: 'This is a prime example of the extent that attackers are willing to go through in their attempt to distribute malware to organizations and individuals around the world. but it could be useful in follow-up targeted attacks against specific users.' Of course, it may be that they really only stole. Of the Piriform claim it had no evidence of much wrongdoing by the hacker, Grooten added: 'As I read the Cisco blog, there was a backdoor that could have been used for other purposes. 'I have a feeling they are downplaying it indeed,' said Martijn Grooten, editor of security publication Virus Bulletin. Not all are convinced by the claims of Piriform, acquired by Avast in July. In other words, to the best of our knowledge, we were able to disarm the threat before it was able to do any harm.' 'Users of CCleaner Cloud version have received an automatic update. 'The threat has now been resolved in the sense that the rogue server is down, other potential servers are out of the control of the attacker. Paul Yung, vice president of product at Piriform, wrote in a post Monday: 'Based on further analysis, we found that the version of CCleaner and the version of CCleaner Cloud was illegally modified before it was released to the public, and we started an investigation process.

Use of DGAs shows some sophistication on the part of the attackers.ĬCleaner's owner, Avast-owned Piriform, has sought to ease concerns. The hackers also used what's known as a domain generation algorithm (DGA) whenever the crooks' server went down, the DGA could create new domains to receive and send stolen data. The malware would send encrypted information about the infected computer - the name of the computer, installed software and running processes - back to the hackers' server. Comparing it to the NotPetya ransomware outbreak, which spread after a Ukrainian accounting app was infected, the researchers discovered the threat on September 13 after CCleaner 5.33 caused Talos systems to flag malicious activity. It has 2 billion downloads and claims to be getting 5 million extra a week, making the threat particularly severe, researchers at Cisco Talos warned. The affected app, CCleaner, is a maintenance and file clean-up software run by a subsidiary of anti-virus giant Avast. According to Avast's own figures, 2.27 million ran the affected software, though the company said users should not panic.

#Ccleaner virus download

The tainted application allows for download of further malware, be it ransomware or keyloggers, with fears millions are affected.

#Ccleaner virus update

“We do not know if this was the same actor as before and it is likely we will never know for sure,” she wrote.Users of Avast-owned security application CCleaner for Windows have been advised to update their software immediately, after researchers discovered criminal hackers had installed a backdoor in the tool. “t is clear that this was an extremely sophisticated attempt against us that had the intention to leave no traces of the intruder or their purpose,” Baloo wrote in a blog post. Avast, which boasts of 400 million users of its products around the world, said it will study its network logs to learn more about the intrusion. Those measures, Avast CISO Jaya Baloo assured customers, were enough to ensure that CCleaner users were unaffected by the attack. Worried that the attackers would manipulate CCleaner again, Avast said it halted an upcoming release of the product, revoked its previous security certificate, and put out a security update to users. The target of the persistent attack was likely Avast’s software-cleaning tool, CCleaner - the same product that was infiltrated in an infamous 2017 supply-chain attack breach that affected over 2 million computers.

An unidentified attacker used stolen credentials to gain high-level privileges on the network of Czech software security vendor Avast, the company said Monday.