alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE [TGI] Cobalt Strike Malleable C2 Response (O365 Profile) M2"; flow:established,to_client; http.header; content:"16723708fc9|0d 0a|X-CalculatedBETarget|3a 20|BY2PR06MB549.namprd06.prod.outlook.com"; content:"X-FEServer|3a 20|CY4PR02CA0010"; distance:0; reference:md5,a26722fc7e5882b5a273239cddfe755f; reference:url,attack.mitre.org/groups/G0080/; classtype:command-and-control; sid:2028589; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_09_17, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2019_09_17, reviewed_at 2024_03_25, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)