Verticals Targeted: Healthcare
Regions Targeted: US, Global
Related Families & Threat Actors: Lynx, ANUBIS, Rhysida, LockBit, ALPHV/BlackCat, Qilin, Medusa, The Gentleman, Payload, NetRunner, Genesis, ShinyHunters, Pay2Key, Handala
Critical Condition: The 2026 Healthcare Cyber Threat Landscape
May 4, 2026 2:15:01 PM / by The Hivemind posted in Threat Bulletin, .NET DNS Backdoor, healthcare data breaches, healthcare cybersecurity, ransomware healthcare, medical device cybersecurity, Iran cyber threat healthcare, hospital cyber attacks, healthcare supply chain attacks
Lyceum .NET DNS Backdoor “DnsSystem”
Jun 24, 2022 2:22:18 PM / by PolySwarm Tech Team posted in Threat Bulletin, Lyceum, Hexane, Siamese Kitten, DnsSystem, .NET DNS Backdoor
Executive Summary
Zscaler recently reported on a new .NET DNS backdoor “DnsSystem” used by the threat actor group known as Lyceum. It is primarily used to target entities in the Middle East.