A Cereal Offender: Analyzing the CORNFLAKE.V3 Backdoor
Source: https://cloud.google.com/blog/topics/threat-intelligence/analyzing-cornflake-v3-backdoor/
A new, low-detected variant of the FireWood Linux backdoor has been discovered, showing changes in implementation and configuration while maintaining core functionality. This backdoor, linked to the 'Project Wood' malware lineage, operates as a remote access trojan on Linux systems, using kernel-level rootkit modules and TEA-based encryption for stealth and persistence. The new variant modifies the execution process, alters network communication, and updates file paths. It removes some commands and adds others, including a new 'auto-kill' feature. Samples have been found from Iran and the Philippines, indicating a potentially wide distribution. The backdoor has possible connections to the China-aligned Gelsemium APT group, though this association remains uncertain.
Docker Hub still hosts dozens of Linux images with the XZ backdoor
Source: https://www.bleepingcomputer.com/news/security/docker-hub-still-hosts-dozens-of-linux-images-with-the-xz-backdoor/
Bitdefender Labs has uncovered a new threat actor group named Curly COMrades, operating since mid-2024 to support Russian interests. The group targets critical organizations in countries experiencing geopolitical shifts, focusing on judicial and government bodies in Georgia and an energy distribution company in Moldova. Their primary objective is to maintain long-term network access and steal credentials. The attackers use proxy tools like Resocks, SSH, and Stunnel to establish multiple entry points, and deploy a new backdoor called MucorAgent. They also utilize compromised legitimate websites as traffic relays to complicate detection. The group's tactics include credential theft, lateral movement, and data exfiltration, employing both custom and open-source tools.
This report details a multi-stage malware campaign delivering the REMCOS backdoor via a malicious Windows LNK shortcut file. The attack begins with social engineering, leveraging PowerShell for initial execution and deploys a persistent backdoor capable of full system compromise. The infection chain involves file download, Base64 decoding, and execution of a malicious PIF file masquerading as a Chrome-related program. The LNK file contains a PowerShell command that downloads and executes a payload, which is then decoded and run as CHROME.PIF. This file is identified as the REMCOS backdoor, capable of various malicious activities including keylogging, screen capture, and remote access. The attack utilizes multiple stages to evade detection and establish persistence on the victim's system.
Chinese threat actors have launched a new phishing campaign using DeedRAT, a modular backdoor. The campaign exploits a DLL side-loading vulnerability in VIPRE Antivirus Premium's MambaSafeModeUI.exe. DeedRAT now includes a new NetAgent module, expanding its capabilities. The malware uses TCP for C2 communication and employs various persistence techniques. Notable features include a custom encryption algorithm using a linear congruential generator, API protection, and junk functions to confuse analysts. The backdoor's continued development and increased obfuscation suggest the threat actors are actively enhancing their tools and techniques.
A new variant of the Odyssey infostealer for macOS has been discovered, featuring code signing, notarization, and a persistent backdoor. The malware mimics a Google Meet updater and uses a SwiftUI-based 'Technician Panel' for social engineering. It steals sensitive data, including passwords, browser information, and cryptocurrency wallet contents. The stealer now includes a second-stage payload that establishes persistence and communicates with a command-and-control server. Notable features include dynamic command execution, network tunneling capabilities, and self-termination mechanisms. The malware also employs anti-analysis techniques to evade researchers. Multiple signed and notarized samples have been identified in the wild, indicating an evolution in the threat actor's tactics.
A sophisticated backdoor targeting Exchange servers of high-value organizations in Asia has been discovered. The malware, named GhostContainer, is a multi-functional backdoor that can be dynamically extended with additional modules. It leverages several open-source projects and employs various evasion techniques to avoid detection. The backdoor grants attackers full control over the Exchange server and can function as a proxy or tunnel. The malware is believed to be part of an APT campaign targeting government and high-tech companies in Asia. It includes components for C2 parsing, virtual page injection, and web proxy functionality. The attackers demonstrated expertise in exploiting Exchange systems and assembling sophisticated espionage tools.
A new phishing campaign targeting healthcare and IT organizations in Russia has been attributed to the Rainbow Hyena cluster. The attackers used compromised email addresses to distribute malicious attachments, including polyglot files and LNK files mimicking legitimate documents. A new custom-built backdoor called PhantomRemote was identified, capable of system information gathering and command execution. The campaign demonstrates a shift in tactics, with threat actors abandoning traditional malicious documents in favor of alternative formats. The sophistication of the tools and techniques suggests a move towards more conventional illicit activities such as espionage and financial gain.
The APT-C-55 (Kimsuky) group, a North Korean threat actor, has launched a new attack campaign targeting South Korea. They used a disguised Bandizip installation package to deliver malicious code and a VMP-protected HappyDoor trojan for espionage activities. The attack involves remote script loading, multi-stage malware deployment, and information theft. The malware collects sensitive data, including user information, system details, and files from specific directories. It also implements keylogging, screen capture, and mobile device monitoring functionalities. The attack methodology and infrastructure align with Kimsuky's historical patterns, including the use of similar scripts, backdoor families, and domain naming conventions.
Atomic macOS Stealer (AMOS) has received a major update, now including an embedded backdoor for persistent access to victims' Macs. This upgrade allows attackers to maintain control, run remote tasks, and potentially gain full system compromise. The Russia-affiliated AMOS threat group has expanded its capabilities, mimicking North Korean attack strategies. The malware is distributed through fake software websites and spear-phishing campaigns. It uses a trojanized DMG file to bypass Gatekeeper, installs persistence via LaunchDaemon, and communicates with command-and-control servers. The backdoor functionality significantly increases the risk to victims, turning one-time breaches into long-term compromises. AMOS campaigns have already affected over 120 countries, with the potential to access thousands of Mac devices worldwide.
A new variant of macOS.ZuRu malware has been discovered, targeting users through a trojanized version of the Termius app. This backdoor, initially noted in 2021, now uses a modified Khepri C2 framework for post-infection operations. The malware is delivered via a .dmg disk image containing a hacked version of Termius.app. It adds two executables to the embedded Termius Helper.app and uses a new method to trojanize legitimate applications. The malware installs persistence via a LaunchDaemon and includes an md5 updater mechanism. The payload obtained from the C2 is a modified Khepri beacon with capabilities for file transfer, system reconnaissance, and command execution. The threat actor continues to target developers and IT professionals, adapting their techniques to evade detection.
When Backups Open Backdoors: Accessing Sensitive Cloud Data via "Synology Active Backup for Microsoft 365"
Source: https://modzero.com/en/blog/when-backups-open-backdoors-synology-active-backup-m365/
OneClik Malware Targets Energy Sector Using Microsoft ClickOnce and Golang Backdoors
Source: https://thehackernews.com/2025/06/oneclik-malware-targets-energy-sector.html
