alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE TINYSHELL irad Variant ICMP Inbound (1spCq0BMbJwCoeZn)"; itype:8; icode:0; content:"|b7 f5 f6 c5 f7 b6 c4 cb e4 cc f1 c5 e9 e3 dc e8|"; 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:2060873; rev:1; metadata:affected_product JunOS, attack_target Client_Endpoint, created_at 2025_03_14, deployment Perimeter, 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:dest_ip;)