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North Korean Hackers Exploit Dell Driver Vulnerability to Disable Home windows Safety

By Ionut Arghire on October 03, 2022

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North Korean state-sponsored hacking group Lazarus was seen exploiting a Dell DBUtil driver vulnerability to disable the safety mechanisms on the focused Home windows machines.

Tracked as CVE‑2021‑21551 (CVSS rating of 8.8), the safety flaw is described as an inadequate entry management problem that might enable authenticated attackers to escalate privileges, trigger a denial-of-service (DoS) situation, or leak data.

Impacting the ‘dbutil_2_3.sys’ driver, the vulnerability is a set of 5 safety defects estimated to impression lots of of hundreds of thousands of Dell desktops, laptops, notebooks, and tablets. Dell launched a patch for this problem in Could 2021.

As a part of the newly analyzed assaults, Lazarus deployed on the right track techniques a device that exploited the Dell DBUtil flaw to disable “the monitoring of all safety options on compromised machines”, utilizing never-before-seen methods in opposition to Home windows kernel mechanisms. That is the primary identified assault exploiting CVE‑2021‑21551.

In response to ESET, Lazarus used the device in assaults concentrating on an worker of a Dutch aerospace firm, and a political journalist at a media outlet in Belgium, seemingly for espionage functions.

On the first stage of the assaults, paperwork containing faux Amazon job gives have been delivered to the 2 victims as attachments, by way of LinkedIn and by way of e-mail, respectively.

As soon as the lure paperwork have been opened, a number of malicious instruments have been deployed on the victims’ techniques, together with backdoors, droppers, loaders, uploaders, and downloaders.

“The commonality between the droppers was that they’re trojanized open-source tasks that decrypt the embedded payload utilizing trendy block ciphers with lengthy keys handed as command line arguments,” ESET says.

What makes these assaults stand out, ESET says, is using a user-mode module to use CVE-2021-21551 to achieve the flexibility to learn and write kernel reminiscence, to “disable seven mechanisms the Home windows working system gives to watch its actions, like registry, file system, course of creation, occasion tracing, and so forth.”

Lazarus was additionally seen using a posh an infection chain, deploying the Blindingcan backdoor, and utilizing a code-signing certificates to signal malicious binaries.

“We attribute these assaults to Lazarus with excessive confidence, primarily based on the precise modules, the code-signing certificates, and the intrusion strategy in widespread with earlier Lazarus campaigns like Operation In(ter)ception and Operation DreamJob,” ESET notes.

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Associated: Excessive-Severity Dell Driver Vulnerabilities Impression Lots of of Tens of millions of Gadgets

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