ET EXPLOIT_KIT DRIVEBY Likely Evil EXE with no referer from HFS webserver (used by Unknown EK)

Query · suricata

flow:established,from_server;
flowbits:isset,exe.no.referer;
http.header;
content:"Server|3a 20|HFS"; fast_pattern;
file.data;
content:"MZ"; within:2;

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_KIT DRIVEBY Likely Evil EXE with no referer from HFS webserver (used by Unknown EK) · Suricata
Esc
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_KIT DRIVEBY Likely Evil EXE with no referer from HFS webserver (used by Unknown EK)";
    flow:established,from_server;
    flowbits:isset,exe.no.referer;
    http.header;
    content:"Server|3a 20|HFS"; fast_pattern;
    file.data;
    content:"MZ"; within:2;
    classtype:exploit-kit;
    sid:2020500; rev:4;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2015_02_23, deployment Perimeter, confidence Medium, signature_severity Major, tag DriveBy, updated_at 2020_05_15;
)

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