alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Buran Ransomware UA"; flow:established,to_server; http.user_agent; content:"autizm"; nocase; fast_pattern; bsize:6; http.header_names; content:!"Referer"; reference:md5,0a73a5bf772fde4868283ce7d5228901; classtype:command-and-control; sid:2029101; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_09, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_27, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)