Mistic Backdoor Linked to Ransomware Access Broker

### Executive Summary Security researchers discovered the Mistic backdoor, attributed to the financially motivated group Woodgnat, using DLL side-loading of MpExtMs.exe to achieve in-memory execution and persistent, low‑footprint access in insurance, education, IT and professional services environments; the tool includes a self-deletion kill switch and is used to establish long-term footholds sold to ransomware affiliates.