alert udp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ransomware/Cerber Checkin 2"; dsize:<11; content:"hi"; depth:2; fast_pattern; pcre:"/^[a-f0-9]{7,}$/R"; threshold:type both, track by_src, count 1, seconds 60; reference:md5,ac4d7fb5739862e9914556ed5d50f84f; classtype:command-and-control; sid:2023453; rev:6; metadata:attack_target Client_Endpoint, created_at 2016_03_28, deployment Perimeter, deprecation_reason Performance, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_02, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)