TROJAN UNC1549 LIGHTRAIL C2 Beacon
This rule detects Command and Control (C2) beaconing activity associated with the UNC1549 threat group and the LIGHTRAIL malware. It specifically looks for HTTP traffic with a URI containing '/news', an 'Upgrade: websocket' header, and a distinct User-Agent string 'Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10136'. This combination of indicators suggests an attempt to tunnel C2 communications over HTTP, potentially masquerading as legitimate WebSocket traffic.
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