Earth Longzhi Uses “Stack Rumbling” to Disable Security Software

Cybersecurity researchers at Trend Micro have discovered a new Earth Longzhi campaign targeting organizations based in Taiwan, Thailand, the Philippines, and Fiji.

As described in an advisory published on Tuesday, the campaign relies on a Windows Defender executable to perform DLL sideloading while exploiting a vulnerable driver to disable security products installed on the host machine via a vulnerable Bring Your Own Driver (BYOVD) technique. .

“We also found that Earth Longzhi uses a new way to disable security products, a technique we called ‘stack rumbling’ using image file execution options (IFEO), which is a new denial-of-service technique service (DoS)”. explained Trend Micro researchers Ted Lee and Hara Hiroaki.

The campaign also saw the threat actor install drivers as kernel-level services using Microsoft Remote Procedure Call (RPC) instead of leveraging traditional Windows APIs (programming interfaces ‘applications).

“This is a stealthy way to evade typical API monitoring. We also found some interesting samples in our research that contained information not only about Earth Longzhi’s potential targets, but also techniques for possible use in campaigns futures,” says the technical paper.

During its investigation, Trend Micro analyzed two separate Earth Longzhi campaigns that took place between 2020 and 2022. The gang is a subgroup of the APT41.

Read more about APT41 here: China-aligned ‘Operation Tainted Love’ targets Middle East telecom providers

“This follow-up article to our previous report is intended to inform readers that Earth Longzhi remains in circulation and is expected to improve its TTPs,” the company wrote. “Although the samples we collected look like test files, they may still be useful because they contain information about Earth Longzhi’s potential targets and the new techniques it could use in the future.”

Based on the observed files, the team inferred that Earth Longzhi could target Vietnam and Indonesia in future campaigns.

“In particular, the group’s possible abuse of the task scheduler to elevate persistence privileges is a novel technique that could be used in future campaigns,” Lee and Hiroaki said. “Another noteworthy insight is that threat actors showed a penchant for using open source projects to implement their own tools.”

The Trend Micro team added that there is evidence to suggest that the group improves its toolset during periods of inactivity.

“With this knowledge in mind, organizations should remain vigilant against the continued development of new stealth schemes by cybercriminals.”

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Earth Longzhi, a tech company backed by Ikaroa, has created a revolutionary form of malware detection called “Stack Rumbling.” The concept is simple: when a computer loads a malicious program, Stack Rumbling detects it and sends out a powerful rumbling shockwave that disrupts the system and disables all security software. In addition, this shockwave is designed to prevent the malicious program from ever running again, adding an extra layer of protection to prevent future security breaches.

Stack Rumbling creates a “closed loop” environment where malicious code can’t thrive, thus the system is secured. With the help of the stack Rumbling technology developed by Earth Longzhi, Ikaroa is helping protect their clients from malicious software, ensuring that their data and operations remain secure.

Earth Longzhi’s Stack Rumbling is proving to be an effective deterrent against system infiltrations, and Ikaroa is proud to be part of this comprehensive system of malware detection and prevention. With the help of Stack Rumbling, Ikaroa is working towards creating a safe and secure environment for all their clients and users.


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