alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BeaverTail CnC Activity (POST) M1"; flow:established,to_server; urilen:<6; http.method; content:"POST"; http.uri; content:"/key"; startswith; pcre:"/^s?$/R"; http.content_type; content:"multipart/form-data"; http.request_body; content:"form|2d|data|3b 20|name|3d 22|ts|22 0d 0a 0d 0a|"; fast_pattern; pcre:"/^[0-9]{13}[\r\n]/R"; content:"form|2d|data|3b 20|name|3d 22|ss|22|"; distance:0; content:"form|2d|data|3b 20|name|3d 22|cc|22|"; distance:0; reference:url,tria.ge/250224-2x153asnx7/behavioral1; reference:md5,97f393aa0083ea0866b5db95f78f3f07; classtype:command-and-control; sid:2060572; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_03_04, deployment Perimeter, malware_family BeaverTail, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_03_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)