alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Poweliks Clickfraud CnC M3"; flow:to_server,established; http.method; content:"GET"; http.uri; content:".php?c="; fast_pattern; pcre:"/\.php\?c=[a-f0-9]{160}$/"; http.referer; content:".php?q="; reference:url,www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/evolution-of-poweliks.pdf; reference:md5,e13234077f513208238203108df30ff4; classtype:command-and-control; sid:2021228; rev:4; metadata:created_at 2015_06_10, signature_severity Major, updated_at 2020_12_22;)