alert tcp $HOME_NET any -> [101.100.182.122,118.189.188.122,158.140.135.244,8.222.225.8] 22 (msg:"ET MALWARE TINYSHELL to Variant (RedPenguin) Connect Back C2"; flow:established,to_server; threshold:type limit, track by_src, seconds 3600, count 1; reference:url,cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper-routers; reference:url,supportportal.juniper.net/s/article/2025-03-Reference-Advisory-The-RedPenguin-Malware-Incident; classtype:command-and-control; sid:2060869; rev:1; metadata:affected_product JunOS, attack_target Client_Endpoint, created_at 2025_03_14, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Major, tag c2, updated_at 2025_03_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)