alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Locky AlphaNum Downloader Oct 3 2016"; flow:established,to_server; flowbits:set,ET.LockyDL; flowbits:noalert; urilen:5<>10; http.method; content:"GET"; http.uri; pcre:"/^\/(?=[a-z]*[0-9][a-z-0-9]*$)(?=[0-9]*[a-z][a-z-0-9]*$)[a-z0-9]{5,8}$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b| MSIE 7.0|3b| Windows NT"; fast_pattern; startswith; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|Cookie|0d 0a|"; content:"|0d 0a|Accept|0d 0a|"; content:"|0d 0a|Accept-Encoding|0d 0a|"; classtype:trojan-activity; sid:2023315; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_03, deployment Perimeter, malware_family Locky, confidence Medium, signature_severity Major, updated_at 2024_03_02;)