alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MirrorBlast Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?id="; content:"&info="; http.user_agent; content:"REBOL"; startswith; fast_pattern; reference:md5,3a8a6702523f9f53866fb2682fdaaf66; classtype:command-and-control; sid:2034012; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_09_10, deployment Perimeter, malware_family MirrorBlast, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_10;)