alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Agent.XST Keepalive"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".asp"; http.header; header_lowercase; content:"content-length|3a 20|2|0d 0a|"; fast_pattern; http.request_body; content:"ok"; startswith; 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|"; threshold:type limit, count 1, seconds 60, track by_src; reference:md5,d579d7a42ff140952da57264614c37bc; reference:url,asert.arbornetworks.com/wp-content/uploads/2016/01/ASERT-Threat-Intelligence-Brief-Uncovering-the-Seven-Pointed-Dagger.pdf; classtype:trojan-activity; sid:2022363; rev:8; metadata:created_at 2016_01_13, malware_family Win32_Agent_XST, signature_severity Major, updated_at 2024_05_04;)