alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Nemucod JS Downloader June 12 2017"; flow:established,to_server; http.uri; pcre:"/\/[A-Za-z0-9]{5,7}\?+[A-Za-z0-9]{6,12}=[A-Za-z0-9]{6,12}$/"; http.header; strip_pseudo_headers; header_lowercase; content:"accept|3a 20 2a 2f 2a 0d 0a|accept-language|3a|"; startswith; http.user_agent; content:"Firefox/51.0"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|cookie|0d 0a|"; classtype:trojan-activity; sid:2024380; rev:8; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_13, deployment Perimeter, malware_family Nemucod, performance_impact Low, confidence Medium, signature_severity Major, tag WS_JS_Downloader, updated_at 2024_05_04;)