alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PunkeyPOS HTTP CnC Beacon 6"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?check"; fast_pattern; pcre:"/\/\?check$/"; http.user_agent; bsize:7; content:"Example"; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:url,trustwave.com/Resources/SpiderLabs-Blog/New-POS-Malware-Emerges---Punkey/; reference:md5,b1fe4120e3b38784f9fe57f6bb154517; classtype:command-and-control; sid:2020940; rev:6; metadata:attack_target Client_Endpoint, created_at 2015_04_17, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_04_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)