alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CrownAdPro CnC Activity M1"; flow:established,to_server; http.uri; content:"/ixset.php?ip="; startswith; fast_pattern; content:"&mcid=1"; distance:0; http.header_names; content:"|0d 0a|Host|0d 0a|Accept|0d 0a 0d 0a|"; bsize:18; reference:url,twitter.com/ViriBack/status/1204883534764077057; reference:md5,514d11884ed88780710f5a84bbb523c7; classtype:command-and-control; sid:2029143; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_12, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2019_12_12;)