alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE RCtrl Backdoor CnC Checkin M1"; flow:established,to_client; content:"Jo*Po*Hello"; offset:4; depth:11; fast_pattern; reference:md5,373224fd766cb9b85e3d42d56d1702f3; reference:url,www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/eagle-eye-is-back-apt30/; classtype:command-and-control; sid:2030401; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_06_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_26;)