alert tcp $HOME_NET any -> $EXTERNAL_NET [445,139] (msg:"ET MALWARE Possible CryptXXX Ransomware Renaming Encrypted File SMB v1 ASCII"; flow:to_server,established; content:"|ff|SMB|07|"; offset:4; depth:5; byte_test:1,!&,0x80,6,relative; content:".crypt|00|"; nocase; distance:0; fast_pattern; classtype:trojan-activity; sid:2022839; rev:1; metadata:attack_target Client_Endpoint, created_at 2016_05_25, deployment Perimeter, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)