alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PolinRider Loader CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:5; content:"/boot"; http.header; content:"X|3a 20|33ff3edaf55a8e03dcbc7cb40d498a49|3a|5-841-du|0d 0a|"; fast_pattern; reference:url,safedep.io/polinrider-ethereum-c2-github-repositories/; classtype:command-and-control; sid:2072581; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_10_28, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, tag c2, updated_at 2026_10_28, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)