alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PunkeyPOS HTTP CnC Beacon 1"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"key="; depth:4; fast_pattern; pcre:"/^[A-Z]+$/R"; http.header_names; content:!"Accept|0d 0a|"; content:!"Referer|0d 0a|"; reference:url,trustwave.com/Resources/SpiderLabs-Blog/New-POS-Malware-Emerges---Punkey/; reference:md5,43c277dd56f9c6de4b8dc249e12039df; classtype:command-and-control; sid:2020935; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_04_17, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_05_21, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)