alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Asprox Passgrub POST CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\x2F[a-f0-9]{40,60}$/i"; http.request_body; content:"akk="; depth:4; content:"&client="; distance:0; reference:url,www.trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-asprox-reborn.pdf; classtype:command-and-control; sid:2016529; rev:3; metadata:attack_target Client_Endpoint, created_at 2013_03_05, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_04_23, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)