alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Agent.XST Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"this is UP"; startswith; fast_pattern; content:"|00 00 00 00|"; http.content_type; bsize:9; content:"text/html"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|accept|0d 0a|"; reference:md5,d579d7a42ff140952da57264614c37bc; reference:url,asert.arbornetworks.com/wp-content/uploads/2016/01/ASERT-Threat-Intelligence-Brief-Uncovering-the-Seven-Pointed-Dagger.pdf; classtype:command-and-control; sid:2022362; rev:6; metadata:created_at 2016_01_13, malware_family Win32_Agent_XST, signature_severity Major, updated_at 2024_05_04;)