alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT SunDown EK NOP Sled Sep 22 2016 (b643)"; flow:established,to_client; file.data; content:"4NWpdLGZ4NWpdLGZ4NWpdLGZ4NWpdLGZ4NWpdLGYUJ"; flowbits:set,SunDown.EK; classtype:exploit-kit; sid:2023273; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2016_09_22, deployment Perimeter, malware_family SunDown, malware_family Exploit_Kit, confidence High, signature_severity Major, tag Exploit_Kit_Sundown, tag possible_exploitation, updated_at 2022_04_18;)