alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE JS/WSF Downloader Dec 08 2016 M5"; flow:from_server,established; flowbits:isset,et.IE7.NoRef.NoCookie; content:"Content-Type|3a 20|text/javascript"; file_data; pcre:"/^(?P<v1>\S{1,100})\s+(?P<v2>\S{1,100})\s+=\s+\x22\x22\x3b\s+(?P=v2)\s+\+\=\s+\x27(?P=v1).+?(?P=v1)\x27\x3b.+?(?P=v2)\s\+=\s[\x22\x27].+?(?P=v2)\s\+=\s[\x22\x27].+?(?P=v2)\s\+=\s[\x22\x27].+?(?P=v2)\s\+=\s[\x22\x27]/R"; classtype:trojan-activity; sid:2023673; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_19, deployment Perimeter, malware_family Trojan_Kwampirs, confidence High, signature_severity Major, updated_at 2019_07_26;)