alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Arbitrium-RAT Observed User-Agent (JustKidding)"; flow:established,to_server; http.user_agent; content:"JustKidding"; bsize:11; reference:url,github.com/BenChaliah/Arbitrium-RAT; classtype:command-and-control; sid:2031529; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_01_19, deployment Perimeter, malware_family Arbitrium_RAT, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_19;)