TLP:CLEAR | CTI Analysts | Updated: March 2026 1. IDENTIFICATION & ATTRIBUTION Naming (known aliases by vendor) The group is tracked under the following names across vendors: APT33 (Mandiant/FireEye, reference designation), Elfin / Elfin Team (Broadcom/Symantec), Refined Kitten (CrowdStrike), Peach Sandstorm (Microsoft, formerly HOLMIUM), MAGNALLIUM (Dragos), COBALT TRINITY (SecureWorks), ATK35, TA451, G0064 (MITRE ATT&CK) (1)(2)(3)(4).…
