alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [TGI] Cobalt Strike Malleable C2 Request (O365 Profile)"; flow:established,to_server; http.uri; content:"/owa/?wa="; startswith; content:"&path=/calendar"; endswith; http.cookie; content:"MicrosoftApplicationsTelemetryDeviceId="; startswith; content:"|3b|ClientId="; distance:0; content:"|3b|MSPAuth="; distance:0; content:"|3b|xid="; distance:0; content:"|3b|wla42="; distance:0; http.header_names; content:!"Referer"; content:"Cookie"; reference:md5,a26722fc7e5882b5a273239cddfe755f; reference:url,attack.mitre.org/groups/G0080/; classtype:command-and-control; sid:2028588; rev:2; 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 2020_09_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)