alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PunkeyPOS HTTP CnC Beacon 5"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?bit="; fast_pattern; content:"&version="; pcre:"/\/\?bit=(?:32|64)&version=\d{4}-\d{1,2}-\d{1,2}$/"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,trustwave.com/Resources/SpiderLabs-Blog/New-POS-Malware-Emerges---Punkey/; reference:md5,b1fe4120e3b38784f9fe57f6bb154517; classtype:command-and-control; sid:2020939; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_04_17, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_30, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)