alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT SunDown EK CVE-2013-2551 Sep 22 2016 (b641)"; flow:established,from_server; file_data; content:"ATUazSM9vDcoOnUbxnU4Oncoynw9z"; flowbits:set,SunDown.EK; classtype:exploit-kit; sid:2023283; rev:3; 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, confidence High, signature_severity Major, tag Exploit_Kit_Sundown, tag CISA_KEV, updated_at 2020_08_20;)