alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Donot Group Pult Downloader Activity (POST) M4"; flow:established,to_server; urilen:8<>28; http.method; content:"POST"; http.uri; content:!"|2e|"; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.request_body; content:"data="; startswith; fast_pattern; http.user_agent; content:!"Linux|3b|"; content:!"iPhone|3b|"; 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|"; content:!"Referer"; reference:md5,3e8c4e12f511646b26633e5318788c81; classtype:trojan-activity; sid:2045233; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_04_28, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03; target:src_ip;)