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Chinese State-Sponsored Group Exploits Windows Zero-Day in Espionage Campaign Against European Diplomats

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3 unique sources, 7 articles

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A China-linked hacking group, UNC6384 (Mustang Panda), is exploiting a Windows zero-day vulnerability (CVE-2025-9491) to target European diplomats in Hungary, Belgium, Italy, the Netherlands, and Serbian government agencies. The campaign involves spearphishing emails with malicious LNK files to deploy the PlugX RAT and gain persistence on compromised systems. The attacks have broadened in scope to include diplomatic entities from Italy and the Netherlands. The zero-day vulnerability allows for remote code execution on targeted Windows systems, enabling the group to monitor diplomatic communications and steal sensitive data. Microsoft has not yet released a patch for this vulnerability, which has been heavily exploited by multiple state-sponsored groups and cybercrime gangs since March 2025. Microsoft has silently mitigated the vulnerability by changing LNK files in the November updates to display all characters in the Target field, not just the first 260. ACROS Security has also released an unofficial patch to limit shortcut target strings to 260 characters and warn users about potential dangers. Security researcher Wietze Beukema disclosed multiple vulnerabilities in Windows LNK shortcut files that allow attackers to deploy malicious payloads. Beukema documented four previously unknown techniques for manipulating Windows LNK shortcut files to hide malicious targets from users inspecting file properties. The most effective variants use forbidden Windows path characters, such as double quotes, to create seemingly valid but technically invalid paths, causing Explorer to display one target while executing another. The most powerful technique identified involves manipulating the EnvironmentVariableDataBlock structure within LNK files to display a fake target in the properties window while actually executing PowerShell or other malicious commands. Microsoft declined to classify the EnvironmentVariableDataBlock issue as a security vulnerability, arguing that exploitation requires user interaction and does not breach security boundaries. Microsoft Defender has detections in place to identify and block this threat activity, and Smart App Control provides an additional layer of protection by blocking malicious files from the Internet. Beukema released "lnk-it-up," an open-source tool suite that generates Windows LNK shortcuts using these techniques for testing and can identify potentially malicious LNK files by predicting what Explorer displays versus what actually executes. CVE-2025-9491 was widely exploited by at least 11 state-sponsored groups and cybercrime gangs. Mustang Panda has expanded operations with a new LOTUSLITE backdoor variant targeting India's banking sector and South Korean/U.S. policy circles. The variant uses CHM files embedding malicious payloads, dynamic DNS C2 servers, and DLL side-loading to deliver remote shell access, file operations, and session management capabilities for espionage purposes.

Timeline

  1. 12.02.2026 23:01 1 articles · 2mo ago

    New LNK Spoofing Techniques Disclosed by Security Researcher

    Security researcher Wietze Beukema disclosed multiple vulnerabilities in Windows LNK shortcut files that allow attackers to deploy malicious payloads. Beukema documented four previously unknown techniques for manipulating Windows LNK shortcut files to hide malicious targets from users inspecting file properties. The discovered issues exploit inconsistencies in how Windows Explorer prioritizes conflicting target paths specified across multiple optional data structures within shortcut files. The most effective variants use forbidden Windows path characters, such as double quotes, to create seemingly valid but technically invalid paths, causing Explorer to display one target while executing another. The most powerful technique identified involves manipulating the EnvironmentVariableDataBlock structure within LNK files to display a fake target in the properties window while actually executing PowerShell or other malicious commands. Microsoft declined to classify the EnvironmentVariableDataBlock issue as a security vulnerability, arguing that exploitation requires user interaction and does not breach security boundaries. Microsoft Defender has detections in place to identify and block this threat activity, and Smart App Control provides an additional layer of protection by blocking malicious files from the Internet. Beukema released "lnk-it-up," an open-source tool suite that generates Windows LNK shortcuts using these techniques for testing and can identify potentially malicious LNK files by predicting what Explorer displays versus what actually executes. CVE-2025-9491 was widely exploited by at least 11 state-sponsored groups and cybercrime gangs, including Evil Corp, Bitter, APT37, APT43 (also known as Kimsuky), Mustang Panda, SideWinder, RedHotel, Konni, and others.

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  2. 31.10.2025 13:29 7 articles · 5mo ago

    UNC6384 (Mustang Panda) Exploits Windows Zero-Day in Espionage Campaign

    The attack chain involves spear-phishing emails with malicious LNK files exploiting CVE-2025-9491 to deliver PlugX RAT for persistence. The malware provides remote access capabilities, anti-analysis techniques, and Windows Registry persistence. The campaign targets European diplomats in Hungary, Belgium, Italy, the Netherlands, and Serbian government agencies, aligning with PRC strategic intelligence requirements. Microsoft silently mitigated CVE-2025-9491 by updating LNK files to display all Target field characters in November 2025. ACROS Security released an unofficial patch limiting shortcut target strings to 260 characters. CVE-2025-9491 was exploited by at least 11 state-sponsored groups and cybercrime gangs since March 2025, including Mustang Panda, Evil Corp, APT37, and others. Mustang Panda has expanded operations with a new LOTUSLITE backdoor variant targeting India's banking sector and South Korean/U.S. policy circles. The variant uses CHM files embedding malicious payloads and legitimate executables, dynamic DNS C2 servers (e.g., editor.gleeze[.]com), and DLL side-loading (dnx.onecore.dll) to deliver remote shell access, file operations, and session management capabilities for espionage purposes.

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