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The last step was to reset all employee credentials. It did so to prevent attackers from using it to sign fake CCleaner updates, in case the hackers managed to get their hands on the old certificate during the recent intrusion.

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The new update was signed with a new digital certificate, and the company revoked the previous certificate used to sign older CCleaner releases. This lasted until October 15, when the company finished auditing previous CCleaner releases, and pushed out a new clean update.ДЄt the same time, Avast also changed the digital certificate it was using to sign CCleaner updates.

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Avast let hackers roam free for two weeks to track their intentionsД«aloo said Avast intentionally left the compromised VPN profile active, with the purpose of tracking the attacker and observing their actions. The alert showed that the compromised user account replicated Avast's Active Directory service, an effective digital map of the company's internal network. ATA stands for Microsoft Advanced Threat Analytics, an on-premise network parsing engine and traffic analysis system that Microsoft sells to enterprises in order to protect internal networks from malicious attacks triggered from inside. Staff eventually tracked down other security alerts inside Avast's ATA dashboard, alerts that engineers previously ignored, thinking they were false positives. This sudden access rights elevation prompted the company to investigate, Baloo told ZDNet in an email today. However, through a successful privilege escalation, the actor managed to obtain domain admin privileges,' said Jaya Baloo, Avast Chief Information Security Officer (CISO). 'The user, whose credentials were apparently compromised, did not have domain admin privileges. The intrusion was detected on September 23, but Avast said it found evidence of the attacker targeting its infrastructure going as far back as May 14, this year. In a statement published today, the company said it believed the attack's purpose was to insert malware into the CCleaner software, similar to the infamous CCleaner 2017 incident.ДЄvast said the breach occurred because the attacker compromised an employee's VPN credentials, gaining access to an account that was not protected using a multi-factor authentication solution.

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