alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT SunDown EK CVE-2015-0016 Sep 22 2016 (b643)"; flow:established,from_server; file_data; content:"9xb4GwTUbwUQoyD09AFIox7g9y6"; flowbits:set,SunDown.EK; classtype:exploit-kit; sid:2023279; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2016_09_22, cve CVE_2015_0016, malware_family SunDown, confidence High, signature_severity Major, tag Exploit_Kit_Sundown, tag CISA_KEV, updated_at 2020_08_19;)