Threats Tagged 'appdomainmanager hijacking'

Unit 42 researchers identified six new remote access Trojan variants deployed by Iran-nexus APT group Screening Serpens between February and April 2026, coinciding with a regional conflict starting February 28, 2026. The group targeted entities in the U.S., Israel, UAE, and other Middle Eastern locations, primarily focusing on technology sector professionals through highly tailored social engineering using personalized recruitment lures. Two new malware families, MiniUpdate and MiniJunk V2, were discovered featuring advanced techniques including AppDomainManager hijacking that manipulates .NET application initialization to disable security mechanisms. The campaigns demonstrated increased technical capabilities and operational resilience, with each variant using dedicated C2 infrastructure hosted on Azure. The attacks leveraged DLL sideloading, scheduled tasks for persistence, and sophisticated evasion techniques to maintain long-term access for espionage purposes.

MediumMalwareUnited StatesIsraelUnited Arab Emirates#minijunk v2#screening serpens#appdomainmanager hijacking

A highly sophisticated multi-stage post-exploitation framework targeting organizations in the Middle East and EMEA financial sectors exploits legitimate digitally signed Intel utilities through .NET AppDomainManager mechanism abuse. The attack leverages trusted binary proxy execution, bypassing EDR and antivirus solutions through JIT-based memory execution and sandbox evasion using computational delays and cryptographic key derivation loops. Initial access occurs via spear-phishing with Arabic-language decoys impersonating Saudi government documents. Once executed, the framework establishes command-and-control communication through Amazon CloudFront CDN domain fronting, employing reflective DLL loading, direct syscall usage, and anti-forensic memory cleanup techniques. The modular plugin-based architecture demonstrates capabilities consistent with advanced persistent threat actors, featuring sophisticated evasion mechanisms including PEB-based API resolution, custom PE export walking, and heap-walking cont...