alert http any any -> any any (msg:"SPYWARE [PTsecurity] DCHSpy Checkin"; flow:established, to_server; http.method; content:"GET"; http.uri; content:".php?"; depth:30; content:"="; distance:2; within:1; pcre:"/^[0-9a-fA-F]{32}/RU"; content:"&check=2"; within:8; endswith; fast_pattern; http.header; content:"User-Agent|3a| Dalvik/"; content:"Connection|3a| Keep-Alive"; distance:0; content:"Accept-Encoding|3a| gzip"; distance:0; content:!"Referer|3a|"; threshold:type limit, track by_src, seconds 180, count 1; reference:url, www.virustotal.com/gui/file/3a052d56706a67f918ed3a9acec9a2da428a20065e261d8e40b73badb4c9d7f4/detection; reference:url, www.lookout.com/threat-intelligence/article/lookout-discovers-iranian-dchsy-surveillanceware; reference:url, rules.ptsecurity.com; classtype:trojan-activity; sid:10014424; rev:1;)