alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Beebus HTTP POST CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/s/asp?"; fast_pattern; http.user_agent; content:"Mozilla/4.0 |28|compatible|3B 20 29 0D 0A|"; startswith; reference:url,blog.fireeye.com/research/2013/02/operation-beebus.html; classtype:command-and-control; sid:2016342; rev:4; metadata:attack_target Client_Endpoint, created_at 2013_02_05, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_18, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)