alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE JS/WSF Downloader Dec 08 2016 M3"; flow:established,to_client; flowbits:isset,et.IE7.NoRef.NoCookie; http.header; header_lowercase; content:"content-disposition|3a 20|"; pcre:"/^[^\r\n]+\.(?:jpe?g|gif|png)\r\n/R"; 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:2023671; rev:6; 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, signature_severity Major, updated_at 2024_04_20;)