alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PSEmpire Checkin via POST"; flow:to_server,established; urilen:14; http.method; content:"POST"; http.uri; content:"/admin/get.php"; fast_pattern; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0) like Gecko"; http.cookie; pcre:"/^SESSIONID=[A-Z0-9]{16}/"; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:url,www.powershellempire.com; classtype:command-and-control; sid:2021616; rev:5; metadata:created_at 2015_08_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_05;)