alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/CryPy Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/victim.php?info="; fast_pattern; content:"&ip="; distance:0; pcre:"/\/victim\.php\?info=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})&ip=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/i"; http.user_agent; content:"Python-urllib"; startswith; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,8bd7cd1eee4594ad4886ac3f1a05273b; reference:url,nakedsecurity.sophos.com/2016/10/18/data-stealing-crpy-ransomware/; classtype:command-and-control; sid:2023345; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_09_09, deployment Perimeter, malware_family Ransomware, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_31, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)