alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PikaBot User-Agent Observed"; flow:established,to_server; http.user_agent; bsize:168; content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|MSIE|20|7|2e|0|3b 20|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|3b 20|Trident|2f|7|2e|0|3b 20 2e|NET4|2e|0C|3b 20 2e|NET4|2e|0E|3b 20 2e|NET|20|CLR|20|2|2e|0|2e|50727|3b 20 2e|NET|20|CLR|20|3|2e|0|2e|30729|3b 20 2e|NET|20|CLR|20|3|2e|5|2e|30729|3b 20|Zoom|20|3|2e|6|2e|0|29|"; classtype:trojan-activity; sid:2065736; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_12, deployment Perimeter, deployment SSLDecrypt, malware_family PikaBot, confidence High, signature_severity Major, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)