tech π¨ Microsoft Defender driver can disable your security
Researchers found that Microsoft Defender's BTR.sys driver can be weaponized for kernel-level attacks. This exploit uses a trusted, signed component within Defender's MpEngine.dll deployed on Windows systems. The driver can execute privileged operations during a 'golden window' before EDRs fully initialize, as noted in the Check Point research. Attackers can use a proof-of-concept tool to construct accepted transactions for this function. Security teams must monitor for suspicious driver deployment context, not just signatures, to stay safe.