alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DonotGroup Backdoor Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\/[A-Za-z0-9]{17}\.php$/"; content:".php"; endswith; http.header_names; content:"|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Cache-Control|0d 0a 0d 0a|"; startswith; http.request_body; content:"data="; startswith; content:"|7c 7c 7c|"; within:258; fast_pattern; reference:md5,9946df6c429b83009535dca8d1a5d321; reference:url,twitter.com/Timele9527/status/1597955256423309312; classtype:trojan-activity; sid:2041120; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_11_30, deployment Perimeter, deployment SSLDecrypt, malware_family DonotGroup, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_04, reviewed_at 2023_09_05; target:src_ip;)