alert http $HOME_NET any -> $EXTERNAL_NET !80 (msg:"ET MALWARE Possible Win32.Bicololo Checkin"; flow:established,to_server; flowbits:set,ET.Bicololo.Request; http.method; content:"GET"; http.uri; content:"/stat/"; nocase; pcre:"/^[a-z]{3,4}\/\d{1,4}$/R"; reference:md5,252c95327ce556a21bdd7e9a322e206c; reference:url,www.virusradar.com/Win32_Bicololo.A/description; classtype:command-and-control; sid:2016946; rev:4; metadata:created_at 2013_05_31, confidence Medium, signature_severity Major, updated_at 2020_04_24;)