alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Known Malicious Doc Downloading Payload Dec 06 2016"; flow:to_server,established; urilen:<12; http.method; content:"GET"; http.uri; pcre:"/^\/(?=[a-z]{0,9}?\d)(?=\d{0,9}?[a-z])[a-z0-9]{4,10}$/"; http.user_agent; content:"Firefox"; fast_pattern; http.accept; content:"*/*"; depth:3; endswith; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|Accept-Encoding|0d 0a|Host|0d 0a|"; depth:62; content:!"Cookie|0d 0a|"; content:!"Referer|0d 0a|"; classtype:trojan-activity; sid:2023583; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_06, deployment Perimeter, malware_family Downloader, malware_family Locky_JS, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_11_05;)