alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Tesch.B CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; http.user_agent; bsize:18; content:"Internet Explorer"; fast_pattern; http.request_body; pcre:"/^[a-f0-9]+(?:\x20[a-f0-9]+)+$/"; http.header_names; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,0032395c3a980e09c511b6b41ab3da48; classtype:command-and-control; sid:2020945; rev:6; metadata:attack_target Client_Endpoint, created_at 2015_04_17, deployment Perimeter, malware_family Win32_Tesch_B, signature_severity Major, tag c2, updated_at 2024_03_10, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)