alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Tflower Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?name="; content:"&state=start"; fast_pattern; endswith; http.header_names; content:!"Referer"; reference:md5,53c923d4e39b966ab951f9a3b9d090be; reference:url,www.bleepingcomputer.com/news/security/tflower-ransomware-the-latest-attack-targeting-businesses/; classtype:command-and-control; sid:2028597; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_09_18, deployment Perimeter, deployment SSLDecrypt, deprecation_reason Age, malware_family Tflower_Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_20, reviewed_at 2024_02_20, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)