alert udp $EXTERNAL_NET any -> $HOME_NET [33615,33568] (msg:"ET MALWARE TINYSHELL impad Variant Command Packet"; dsize:4; byte_test:1,>=,0x80,0; byte_test:1,<=,0x88,0; content:"|e3 c6 b9|"; 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:2060871; 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;)