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This article details how attackers can weaponize Microsoft Defender's legitimate Boot-Time Removal (BTR.sys) driver to disable endpoint security from the kernel level, highlighting a critical "Living-off-the-Land" threat vector rather than a traditional software vulnerability. The research underscores the risks associated with undocumented protocols in signed system components that grant Ring 0 privileges for file deletion and registry manipulation. Understanding these specific attack mechanics is essential for hardening Windows kernel defenses against sophisticated adversary tradecraft.
Microsoft Defender Driver Can Be Weaponized to Disable EDR and AV From Windows Kernel
Microsoft Defender’s legitimate Boot-Time Removal (BTR.sys) driver can be repurposed to perform powerful kernel-level file and registry operations, potentially enabling attackers with administrative privileges to neutralize endpoint security protections. The Check Point research does not describe a conventional vulnerability or memory-corruption flaw; instead, it exposes how a trusted, Microsoft-signed remediation component can become a Living-off-the-Land […] The post Microsoft Defender Driver Can Be Weaponized to Disable EDR and AV From Windows Kernel appeared first on Cyber Security News.
Microsoft Defender’s legitimate Boot-Time Removal (BTR.sys) driver can be repurposed to perform powerful kernel-level file and registry operations, potentially enabling attackers with administrative privileges to neutralize endpoint security protections. The Check Point research does not describe a conventional vulnerability or memory-corruption flaw; instead, it exposes how a trusted, Microsoft-signed remediation component can become a Living-off-the-Land driver when its undocumented transaction protocol is reproduced.…
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