January 14, 2025—KB5050048 (Monthly Rollup)

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January 14, 2025—KB5049993 (OS Build 14393.7699)

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RansomHub Group Deploys New EDR-Killing Tool in Latest Cyber Attacks

A cybercrime group with links to the RansomHub ransomware has been observed using a new tool designed to terminate endpoint detection and response EDR software on compromised hosts, joining the likes of other similar programs like AuKill aka AvNeutralizer and Terminator. The EDR-killing utility h...

Reaper - Proof Of Concept On BYOVD Attack

Reaper is a proof-of-concept designed to exploit BYOVD Bring Your Own Vulnerable Driver driver vulnerability. This malicious technique involves inserting a legitimate, vulnerable driver into a target system, which allows attackers to exploit the driver to perform malicious actions. Reaper was...

GHOSTENGINE Exploits Vulnerable Drivers to Disable EDRs in Cryptojacking Attack

Cybersecurity researchers have discovered a new cryptojacking campaign that employs vulnerable drivers to disable known security solutions EDRs and thwart detection in what's called a Bring Your Own Vulnerable Driver BYOVD attack. Elastic Security Labs is tracking the campaign under the name...

Lazarus Hackers Exploited Windows Kernel Flaw as Zero-Day in Recent Attacks

The notorious Lazarus Group actors exploited a recently patched privilege escalation flaw in the Windows Kernel as a zero-day to obtain kernel-level access and disable security software on compromised hosts. The vulnerability in question is CVE-2024-21338 CVSS score: 7.8, which can permit an...

Kasseika Ransomware Employs BYOVD Tactic to Impair Defenses

Summary: The ransomware operation Kasseika has recently been identified using the Bring Your Own Vulnerable Driver BYOVD tactic. This involves exploiting vulnerabilities in a loaded driver to disable antivirus software before initiating the file encryption process. Through this strategy, the...

Kasseika Ransomware Using BYOVD Trick to Disarms Security Pre-Encryption

The ransomware group known as Kasseika has become the latest to leverage the Bring Your Own Vulnerable Driver BYOVD attack to disarm security-related processes on compromised Windows hosts, joining the likes of other groups like Akira, AvosLocker, BlackByte, and RobbinHood. The tactic allows...

Kasseika Ransomware Deploys BYOVD Attacks, Abuses PsExec and Exploits Martini Driver

In this blog, we detail our investigation of the Kasseika ransomware and the indicators we found suggesting that the actors behind it have acquired access to the source code of the notorious BlackMatter ransomware...

How ransomware operators try to stay under the radar

An often heard remark is that when your security solution notices a ransomware attack, it’s already too late. Theres a lot of truth in that, if you consider the encryption process to be the ransomware attack. However, these days encryption is just a part of many ransomware attacks. Some of the...

Researchers Find 34 Windows Drivers Vulnerable to Full Device Takeover

As many as 34 unique vulnerable Windows Driver Model WDM and Windows Driver Frameworks WDF drivers could be exploited by non-privileged threat actors to gain full control of the devices and execute arbitrary code on the underlying systems. "By exploiting the drivers, an attacker without privilege...

BlackCat Operators Distributing Ransomware Disguised as WinSCP via Malvertising

Threat actors associated with the BlackCat ransomware have been observed employing malvertising tricks to distribute rogue installers of the WinSCP file transfer application. "Malicious actors used malvertising to distribute a piece of malware via cloned webpages of legitimate organizations," Tre...

Chinese Hacker Group Earth Longzhi Resurfaces with Advanced Malware Tactics

A Chinese state-sponsored hacking outfit has resurfaced with a new campaign targeting government, healthcare, technology, and manufacturing entities based in Taiwan, Thailand, the Philippines, and Fiji after more than six months of no activity. Trend Micro attributed the intrusion set to a cyber...

Chinese Hacker Group Earth Longzhi Resurfaces with Advanced Malware Tactics

A Chinese state-sponsored hacking outfit has resurfaced with a new campaign targeting government, healthcare, technology, and manufacturing entities based in Taiwan, Thailand, the Philippines, and Fiji after more than six months of no activity. Trend Micro attributed the intrusion set to a cyber...

Ransomware Hackers Using AuKill Tool to Disable EDR Software Using BYOVD Attack

Threat actors are employing a previously undocumented "defense evasion tool" dubbed AuKill that's designed to disable endpoint detection and response EDR software by means of a Bring Your Own Vulnerable Driver BYOVD attack. "The AuKill tool abuses an outdated version of the driver used by version...

Lazarus Group Exploits Zero-Day Vulnerability to Hack South Korean Financial Entity

The North Korea-linked Lazarus Group has been observed weaponizing flaws in an undisclosed software to breach a financial business entity in South Korea twice within a span of a year. While the first attack in May 2022 entailed the use of a vulnerable version of a certificate software that's wide...

Lazarus Group Exploits Zero-Day Vulnerability to Hack South Korean Financial Entity

The North Korea-linked Lazarus Group has been observed weaponizing flaws in an undisclosed software to breach a financial business entity in South Korea twice within a span of a year. While the first attack in May 2022 entailed the use of a vulnerable version of a certificate software that's wide...

BlackLotus Becomes First UEFI Bootkit Malware to Bypass Secure Boot on Windows 11

A stealthy Unified Extensible Firmware Interface UEFI bootkit called BlackLotus has become the first publicly known malware capable of bypassing Secure Boot defenses, making it a potent threat in the cyber landscape. "This bootkit can run even on fully up-to-date Windows 11 systems with UEFI Secu...

Hackers Exploit Vulnerabilities in Sunlogin to Deploy Sliver C2 Framework

Threat actors are leveraging known flaws in Sunlogin software to deploy the Sliver command-and-control C2 framework for carrying out post-exploitation activities. The findings come from AhnLab Security Emergency response Center ASEC, which found that security vulnerabilities in Sunlogin, a remote...

The Bug Report October 2022 Edition

The Bug Report — October 2022 Edition By Trellix · November 2, 2022 This story was written by Richard Johnson. Do ROP exploits count as jmp scares? Why am I here? Welcome back to the Bug Report: Spooky Edition, and we’ve got bugs crawling out of the walls! Of all the months we do this, we’ve foun...