alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Chinese Based APT Related Malware Sending System Information (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".aspx"; endswith; http.header; content:"User-Agent|3a 20|Mozilla/5.0|0d 0a|"; fast_pattern; http.request_body; content:"data="; startswith; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,85f8bfb3b859a35e342e35d7c35e8746; reference:url,www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/apt31-cloud-attacks/; classtype:trojan-activity; sid:2038772; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_09_07, deployment Perimeter, deployment SSLDecrypt, malware_family TontoTeam, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_12;)