alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE AtlasAgent Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"|2e|"; http.header_names; content:"|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|"; startswith; content:!"Referer"; http.request_body; content:"orderinfo="; startswith; fast_pattern; content:"--"; endswith; within:20; reference:md5,ba85467ceff628be8b4f0e2da2a5990c; reference:url,nsfocusglobal.com/warning-newly-discovered-apt-attacker-atlascross-exploits-red-cross-blood-drive-phishing-for-cyberattack/; classtype:command-and-control; sid:2048357; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_09_28, deployment Perimeter, deployment SSLDecrypt, deprecation_reason Age, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08, reviewed_at 2024_04_08; target:src_ip;)