alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Locky Intermediate Downloader"; flow:established,to_server; urilen:1; http.method; content:"POST"; http.user_agent; content:"Windows-Update-Agent"; fast_pattern; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,4f03e360be488a3811d40c113292bc01; classtype:trojan-activity; sid:2024900; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_10_23, deployment Perimeter, confidence High, signature_severity Major, tag Locky, updated_at 2024_04_28;)