alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TA402 Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.header_names; content:"|0d 0a|Auth-Token|0d 0a|"; nocase; http.request_body; content:"|00 22 00|c|00|o|00|m|00|p|00|u|00|t|00|e|00|r|00 5f 00|i|00|d|00 22 00 3a 00 22 00|"; fast_pattern; classtype:trojan-activity; sid:2049159; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_10_19, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_TA402, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_13, reviewed_at 2023_10_19, former_sid 2855436; target:src_ip;)