alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Dyreza RAT Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"_W"; content:"|2e|"; distance:6; within:1; content:"/publickey/"; fast_pattern; http.header_names; content:!"Accept|0d 0a|"; content:!"Connection|0d 0a|"; content:!"Referer|0d 0a|"; reference:md5,b61145a54698753cecf8748359c9d81e; classtype:command-and-control; sid:2018579; rev:9; metadata:created_at 2014_06_12, signature_severity Major, updated_at 2020_09_25;)