alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kraken Ransomware End Activity"; flow:established,to_server; http.uri; content:!"."; content:!"&"; content:!"?"; http.user_agent; content:"-"; offset:2; depth:1; content:"|3a|End"; distance:0; fast_pattern; pcre:"/^[A-Z]{2}-[0-9]{1,5}\x3aEnd(?:\x3a[0-9]{1,5})?$/"; http.header_names; content:!"Accept"; content:!"Referer"; reference:md5,09d3bd874d9a303771c89385d938c430; classtype:trojan-activity; sid:2026473; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_11, deployment Perimeter, malware_family Kraken_Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)