alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Witch.3FA0!tr CnC Activity M2"; flow:established,to_server; http.request_line; content:"GET /?opt=put&mq=loader_tx_report"; startswith; fast_pattern; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; http.uri; content:"&mac="; content:"&pcname="; distance:12; within:8; reference:md5,c52f17b858b143310dc1cb218feca5c8; classtype:command-and-control; sid:2034220; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_10_18, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_18;)