It will shut down if either requirement is not met. It also requires that the attacker runs the file with a keyword or password. Once executed, AuKill determines that it has admin privileges, which it needs to operate. Both are present and signed by Microsoft. It drops the older driver into the system's Windows OS, where it can sit with the newer Process Explorer driver already in the system. Microsoft realizes it hasn't updated list of banned dodgy Windows 10 drivers in years READ MOREĪuKill is designed to both abuse a legitimate but outdated driver while also getting Microsoft to digitally sign it. "Sophos believes the author of AuKill used multiple code snippets from, and built their malware around, the core technique introduced by Backstab," Klopsch writes. Sophos over the past few months collected six variants of AuKill and found myriad similarities between Backstab and Aukill, including characteristic debug strings and almost identical code flow logic used to interact with the driver. Medusa ransomware crew brags about spreading Bing, Cortana source code.Shared memory vulnerability in IBM's Db2 database could let nefarious insiders wreak havoc – so get patching.Don't let ransomware crooks spend months in your network – like this govt agency did.Russian-linked Shuckworm crew ramps up Ukraine attacks.The signature is seen by the OS verification of the software's identity. For security reasons, Windows include a feature called Driver Signature Enforcement, which ensures that kernel-mode drivers have been signed by a valid code-signing authority before Windows lets them run. Though low-level system components, they can access critical security structures in the kernel memory. Three months later, SentinelOne researchers wrote about MalVirt, a tool that used the same Process Explorer driver.ĭrivers make attractive tools for cybercriminals. In November 2022, a criminal used Backstab to disable EDR processes before delivering LockBit. An open-source anti-malware tool called Backstab, first published in 2021, or a version of it has been used in attacks. This isn't the first time the Process Explorer driver was exploited to enable malware to bypass EDR systems.
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