alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/DirCrypt.Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"Content-Disposition|3A| form-data|3B| name=|22|cmd|22|"; content:"Content-Disposition|3A| form-data|3B| name=|22|botid|22|"; fast_pattern; content:"Content-Disposition|3A| form-data|3B| name=|22|lid|22|"; reference:url,blog.avast.com/2013/10/24/what-to-do-if-your-computer-is-attacked-by-ransomware/; reference:url,blog.avast.com/2013/11/21/ransomware-annoys-its-victims-by-displaying-child-pornography-pictures/#more-20393; reference:url,johannesbader.ch/2015/03/the-dga-of-dircrypt; reference:url,anubis.iseclab.org/?action=result&task_id=19e3b6cbfdf8d6bd429ecc75ed016fb91; classtype:command-and-control; sid:2017308; rev:4; metadata:attack_target Client_Endpoint, created_at 2013_08_12, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2020_04_27, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)