alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sharik/Smoke CnC Beacon 12"; flow:established,to_server; urilen:<6; http.method; content:"POST"; http.uri; content:"/"; endswith; content:!"."; content:!"&"; http.user_agent; pcre:"/(?:MSIE|rv\x3a)/"; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/"; http.connection; content:"keep-alive"; nocase; http.content_type; content:"application/x-www-form-urlencoded"; http.content_len; content:"63"; fast_pattern; depth:2; endswith; http.header_names; content:"|0d 0a|Content-Type|0d 0a|Accept|0d 0a|Host|0d 0a|Referer|0d 0a|User-Agent"; reference:md5,6ccf5004f5bd1ffd26a428961a4baf6e; classtype:command-and-control; sid:2026555; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_25, deployment Perimeter, malware_family Sharik, malware_family SmokeLoader, confidence High, signature_severity Major, tag c2, updated_at 2020_09_16, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)