alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sharik/Smoke CnC Beacon 3"; flow:established,to_server; urilen:1; http.request_line; content:"POST / 1.1"; startswith; endswith; fast_pattern; http.content_type; content:"application/x-www-form-urlencoded"; startswith; endswith; http.header_names; strip_pseudo_headers; to_lowercase; content:"|0d 0a|content-type|0d 0a|user-agent|0d 0a|"; startswith; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,789ee114125a6e1db363b505a643c03d; classtype:command-and-control; sid:2021632; rev:8; metadata:attack_target Client_Endpoint, created_at 2015_08_14, deployment Perimeter, deprecation_reason Age, signature_severity Major, tag c2, updated_at 2024_05_04, reviewed_at 2024_04_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)