alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT JS Browser Based Ransomware"; flow:established,from_server; file_data; content:"YOUR BROWSER HAS BEEN LOCKED.|5c|n|5c|nALL PC DATA WILL BE DETAINED"; reference:url,blog.malwarebytes.org/intelligence/2013/07/fbi-ransomware-now-targeting-apples-mac-os-x-users/; reference:url,www.f-secure.com/weblog/archives/00002577.html; classtype:trojan-activity; sid:2017165; rev:2; metadata:attack_target Client_Endpoint, created_at 2013_07_19, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)