ET EXPLOIT Possible Spectre PoC Download In Progress

Query · suricata

flow:established,from_server;
flowbits:isset,ET.http.binary;
file_data;
content:"|E7 03 00 00|";
content:"|48 0F AE|"; distance:17; within:9;
pcre:"/^[\x30-\x3f\x7D]/Rs";
content:"|48 0F AE 3D|"; distance:41; within:10;
content:"|48 98|"; distance:64; within:22;
content:"|0F 01 F9|"; distance:50; within:9;
content:"|0F 01 F9|"; distance:30; within:9;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET EXPLOIT Possible Spectre PoC Download In Progress · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Possible Spectre PoC Download In Progress";
    flow:established,from_server;
    flowbits:isset,ET.http.binary;
    file_data;
    content:"|E7 03 00 00|";
    content:"|48 0F AE|"; distance:17; within:9;
    pcre:"/^[\x30-\x3f\x7D]/Rs";
    content:"|48 0F AE 3D|"; distance:41; within:10;
    content:"|48 98|"; distance:64; within:22;
    content:"|0F 01 F9|"; distance:50; within:9;
    content:"|0F 01 F9|"; distance:30; within:9;
    reference:cve,2017-5753;
    reference:cve,2017-5715;
    classtype:attempted-admin;
    sid:2025196; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2018_01_10, cve CVE_2017_5753, deployment Perimeter, malware_family Spectre_Exploit, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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