ET EXPLOIT Possible Microsoft Edge Chakra.dll Type Confusion (CVE-2016-7200 CVE-2016-7201) Observed in SunDown EK 1

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Possible Microsoft Edge Chakra.dll Type Confusion (CVE-2016-7200 CVE-2016-7201) Observed in SunDown EK 1";
    flow:established,to_client;
    file_data;
    content:"0x1DA2F5"; fast_pattern; nocase;
    content:"0x1DA2CB"; nocase; distance:0;
    content:"getPrototypeOf"; nocase;
    content:".__proto__"; nocase;
    content:"Symbol.species";
    reference:cve,2016-7200;
    reference:url,malware.dontneedcoffee.com/2017/01/CVE-2016-7200-7201.html;
    classtype:attempted-user;
    sid:2023700; rev:2;
    metadata:affected_product Microsoft_Edge_Browser, attack_target Client_Endpoint, created_at 2017_01_06, cve CVE_2016_7200, deployment Perimeter, confidence Medium, signature_severity Critical, tag Exploit_Kit_Sundown, tag CISA_KEV, updated_at 2019_07_26;
)