alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [PTsecurity] Kraken Ransomware Start Activity 2"; flow:established,to_server; http.uri; content:!"."; content:!"&"; content:!"?"; http.user_agent; content:"-"; offset:2; depth:1; content:"|3a|StartU"; endswith; fast_pattern; pcre:"/^[A-Z]{2}-[0-9]{1,5}\x3aStartU$/"; http.header_names; content:!"Accept"; content:!"Referer"; classtype:trojan-activity; sid:2026472; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_11, deployment Perimeter, deprecation_reason Age, malware_family Kraken_Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_18, reviewed_at 2023_12_18, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)