alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Malicious Tor Module Download"; flow:established,to_server; http.uri; content:"/tor/"; fast_pattern; pcre:"/\/tor\/[^\x2f\x2e]+(?:32|64)\.dll$/i"; http.content_type; content:"application/x-www-form-urlencoded"; startswith; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:md5,dacbf4c26c5642c29e69e336e0f111f7; classtype:trojan-activity; sid:2023471; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_01, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_10_07;)