Sunday, May 22, 2022

MysterySnail attacks with Windows zero-day

Executive Summary

In late August and early September 2021, Kaspersky technologies detected attacks with the use of an elevation of privilege exploit on multiple Microsoft Windows servers. The exploit had numerous debug strings from an older, publicly known exploit for vulnerability CVE-2016-3309, but closer analysis revealed that it was a zero-day. We discovered that it was using a previously unknown vulnerability in the Win32k driver and exploitation relies heavily on a technique to leak the b…

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