alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE JS/WSF Downloader Dec 08 2016 M6"; flow:from_server,established; flowbits:isset,et.IE7.NoRef.NoCookie; http.header; pcre:"/Content-Disposition\x3a[^\r\n]+=[\x22\x27]?[a-z]?\d{1,3}(?:\.dat)?[\x22\x27]?\r\n/mi"; file.data; content:"MZ"; within:2; byte_jump:4,58,relative,little; content:"PE|00 00|"; fast_pattern; distance:-64; within:4; classtype:trojan-activity; sid:2023679; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_23, deployment Perimeter, malware_family Trojan_Kwampirs, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_12_11;)