alert http $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE Win32/PurpleFox Retrieving File (GET)"; flow:established,to_server; http.request_line; content:"GET /conf.dat HTTP/1.1"; fast_pattern; http.user_agent; content:"Mozilla/4.0|20|(compatible|3b 20|MSIE 6.0|3b 20|Windows|20|NT|20|5.0)"; bsize:50; http.header_names; content:!"Referer"; reference:md5,57b8bccf9cb8592ae86b4453cf74b4e8; classtype:trojan-activity; sid:2035385; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_03, deployment Perimeter, malware_family PurpleFox, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_03;)