alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Witch.3FA0!tr CnC Activity"; flow:established,to_server; http.request_line; content:"POST /?opt=put&type=text"; startswith; fast_pattern; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; http.request_body; content:"&mac="; content:"&pcname="; distance:12; within:8; reference:md5,db7ffa8d3fa480e489c9062b18067f36; classtype:command-and-control; sid:2033814; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_08_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_26;)