Recent findings from investigation into the CCleaner hack

CCleaner for Windows
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		<span style="background-color:#ffffff;color:#47566c;font-size:18px;text-align:left;">To initiate the CCleaner attack, the threat actors first accessed Piriform’s network on March 11, 2017, four months before Avast acquired the company, using TeamViewer on a developer workstation to infiltrate.</span>
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https://blog.avast.com/update-ccleaner-attackers-entered-via-teamviewer

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"It's not our fault--really!" :o