Kernel access gives attackers free rein to tamper or terminate endpoint security products or inject code into protected processes. However, it is also imperative for security vendors to protect the user-to-kernel boundary because once an attacker can execute code in the kernel, security tools can no longer effectively protect the host. Organizations can reduce their risk by limiting administrative user permissions. Vulnerable drivers have now been used by ransomware to terminate security software before encrypting the system. At the time, the risk to everyday users was relatively low, as these techniques were mostly leveraged by advanced state actors and top red teams.įast forward to 2022, and attacks leveraging vulnerable drivers are a growing concern due to a proliferation of open source tools to perform these attacks. We showed this was practical, even with hypervisor mode integrity protection ( HVCI) and Windows Hardware Quality Labs ( WHQL) signing requirement enabled. The most concerning trend was towards leveraging known good but vulnerable drivers to gain kernel mode execution. In 2018, Gabriel Landau and I presented a talk at Black Hat covering the evolution of kernel mode threats on Windows. Elastic Endpoint (8.3+) protects users from this threat.Elastic Security released 65 YARA rules to detect vulnerable driver abuse.Ransomware actors are leveraging vulnerable drivers to tamper with endpoint security products.
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