alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Patchwork APT Related Activity M3 (POST)"; flow:established,to_server; urilen:>80; http.method; content:"POST"; http.uri; content:".php"; endswith; http.user_agent; content:"Mozilla/5.0"; bsize:11; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.header_names; content:"|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a 0d 0a|"; bsize:52; fast_pattern; http.request_body; pcre:"/^[a-z]{4}\x3d/"; reference:md5,3c1af7611eeebb6d873f00d99189bc40; classtype:trojan-activity; sid:2037963; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_08_09, deployment Perimeter, malware_family Patchwork, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_09;)