alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Fake Microsoft Teams CnC Payload Request (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/file/get-file/"; startswith; fast_pattern; http.header_names; content:!"|0d 0a|referer|0d 0a|"; nocase; content:!"|0d 0a|cookie|0d 0a|"; nocase; content:!"|0d 0a|authorization|0d 0a|"; nocase; http.connection; content:"Keep-Alive"; http.host; content:!"filemail.com"; reference:url,github.com/PaloAltoNetworks/Unit42-timely-threat-intel/blob/main/2025-01-22-IOCs-for-malware-from-fake-Microsoft-Teams-site.txt; classtype:command-and-control; sid:2059607; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_23, deployment Perimeter, confidence High, signature_severity Critical, tag c2, updated_at 2025_01_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)