alert http any any -> any any (msg:"BACKDOOR [PTsecurity] SpyGlace C2 communication (APT DarkHotel)"; flow:established, to_server; http.method; content:"POST"; http.uri; content:".asp"; endswith; http.header; content:"Content-Type: application/x-www-form-urlencoded|3b| charset=UTF-8"; content:!"Referer"; http.request_body; content:"a001="; startswith; content:"&a002="; distance:32; within:6; content:"&a003="; distance:32; within:6; fast_pattern; content:"&a004="; distance:3; within:7; threshold:type limit, track by_src, count 1, seconds 300; reference:url, rules.ptsecurity.com; classtype:trojan-activity; sid:10012150; rev:1;)