alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [PTsecurity] Kuriyama Loader Checkin"; flow:established, to_server; threshold:type both, track by_src, count 2, seconds 60; http.method; content:"GET"; http.uri; content:"?hwid="; content:"&group="; fast_pattern; content:"&os="; content:"&cpu="; http.header_names; content:!"Referer|0d 0a|"; reference:url,darkwebs.ws/threads/41806/; reference:md5,e18c73ec38cbdd0bb0c66f360183e6d9; classtype:command-and-control; sid:2025253; rev:6; metadata:created_at 2018_01_26, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_19;)