alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE LokiBot Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; http.header; content:"Content-Key|3a 20|"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Accept|0d 0a|Content-Type|0d 0a|"; startswith; nocase; reference:md5,5ba6cf36f57697a1eb5ac8deaa377b4b; classtype:command-and-control; sid:2025381; rev:7; metadata:created_at 2015_11_24, malware_family lokibot, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_20;)