Wednesday , February 19 2025
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Avast report
Hackers Exploited Windows Kernel Flaw as Zero-Day in attack

Microsoft updated a security flaw in its AppLocker software, but the North Korean Lazarus Group was able to use it for a cyberattack before the update.

Avast researchers found the flaw in Microsoft software under the CVE-2024-21338. This flaw allowed Lazarus to use an updated version of its own malware called “FudModule” to access the admin-to-kernel boundary.

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The zero-day was fixed by Microsoft on February 13th as part of their February Patch Tuesday update. Avast shared details of the exploit on February 29th.

Avast researchers have discovered that the FudModule now has additional features. One of these features is the ability to suspend protected process light (PPL) processes found in Microsoft Defender, Crowdstrike Falcon, and HitmanPro.

Lazarus Group changed their tactics, switching from using their own vulnerable driver to using a more direct zero-day exploit approach to escalate privileges to kernel level.

Avast also discovered a new Lazarus remote access Trojan (RAT), about which the vendor pledges to release more details later.

“Though their [Lazarus Group’s] signature tactics and techniques are well-recognized by now, they still occasionally manage to surprise us with an unexpected technical sophistication,” the Avast report said. “The FudModule rootkit serves as the latest example, representing one of the most complex tools Lazarus holds in their arsenal.”

Source: Avast, darkreading

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