Versions (3)
Version DetailsCurrent
Rev: 3 • Apr 20, 2022, 12:00 PMET MALWARE Cobalt Strike X-Client Header (notevil)
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike X-Client Header (notevil)"; flow:established,to_server; http.header; content:"|0d 0a|X-Client: notevil|0d 0a|"; fast_pattern; reference:url,cert.gov.ua/article/39708; classtype:trojan-activity; sid:2036282; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_20, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_03_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)
Apr 20, 2022, 12:00 PM
Mar 14, 2023, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-malware.rules