alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bolek HTTP Checkin"; flow:to_server,established; http.method; content:"GET"; http.uri; pcre:"/\?[a-f0-9]{32}$/i"; http.user_agent; content:"Client 1.2"; fast_pattern; bsize:10; reference:md5,e89ff40a8832cd27d2aae48ff7cd67d2; reference:url,malware-traffic-analysis.net/2016/06/09/index2.html; classtype:command-and-control; sid:2022889; rev:3; metadata:created_at 2016_06_10, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_14;)