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BlackByte Ransomware Abuses Official Driver to Disable Safety Protections

By Ionut Arghire on October 06, 2022

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The BlackByte ransomware has been noticed concentrating on a vulnerability in a legit driver to disable endpoint detection and response (EDR) options operating on the sufferer machine.

Though a decryptor for BlackByte ransomware was launched in October final 12 months, the risk has continued to stay energetic, with the FBI warning of assaults concentrating on essential infrastructure sectors, together with authorities, monetary, and meals and agriculture organizations.

Whereas investigating latest exercise surrounding the ransomware-as-a-service (RaaS) and its new knowledge leak website, Sophos safety researchers found that the risk has been utilizing a classy approach that enables it to bypass safety merchandise.

Known as ‘Convey Your Personal Driver’, the approach entails dropping a weak driver model on the sufferer’s machine, executing it, and abusing it to take away course of creation callbacks from the kernel reminiscence.

For this, BlackByte ransomware abuses drivers that Micro-Star’s graphics card overclocking utility MSI AfterBurner 4.6.2.15658 makes use of to realize prolonged management over graphic playing cards on the system. The ransomware operators additionally use legitimate code signing certificates to signal these drivers.

The RTCore64.sys driver, Sophos explains, is affected by an authenticated learn/write arbitrary reminiscence vulnerability. Tracked as CVE-2019-16098, the problem results in privilege escalation, info disclosure, and code execution with elevated privileges.

The approach works as a result of “the I/O management codes in RTCore64.sys are immediately accessible by user-mode processes” and since the focused vulnerability will be exploited by merely accessing these management codes, with out the necessity for exploit code.

BlackByte ransomware exploits the weak driver to take away callback entries of drivers utilized by EDR merchandise from kernel reminiscence, by overwriting them with zeros.

“The evasion approach helps disabling a whopping checklist of over 1,000 drivers on which safety merchandise rely to supply safety,” Sophos notes.

Different ransomware households on the market had been additionally seen utilizing this system in assaults this 12 months, albeit they abuse totally different drivers, together with the mhyprot2.sys anti-cheat driver for the Genshin Influence online game and the aswarpot.sys Avast anti-rootkit driver, which was being abused by AvosLocker ransomware.

Associated: FBI Warns of BlackByte Ransomware Assaults on Essential Infrastructure

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Associated: Variety of Ransomware Assaults on Industrial Orgs Drops Following Conti Shutdown

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