alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Galock Ransomware Command"; flow:established,from_server; file_data; content:"[LOCK]"; within:6; endswith; reference:url,twitter.com/kafeine/status/314859973064667136/photo/1; classtype:trojan-activity; sid:2016645; rev:3; metadata:attack_target Client_Endpoint, created_at 2013_03_22, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2019_09_28, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)