ET EXPLOIT_KIT SUSPICIOUS JAR Download by Java UA with non JAR EXT matches various EKs

Query · suricata

flow:established,from_server;
flowbits:isset,ET.JavaNotJar;
flowbits:unset,ET.JavaNotJar;
http.header;
content:!".jar"; nocase;
file.data;
content:"PK"; within:2;
content:".class"; distance:0; fast_pattern;

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 SUSPICIOUS JAR Download by Java UA with non JAR EXT matches various EKs · 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_KIT SUSPICIOUS JAR Download by Java UA with non JAR EXT matches various EKs";
    flow:established,from_server;
    flowbits:isset,ET.JavaNotJar;
    flowbits:unset,ET.JavaNotJar;
    http.header;
    content:!".jar"; nocase;
    file.data;
    content:"PK"; within:2;
    content:".class"; distance:0; fast_pattern;
    classtype:exploit-kit;
    sid:2016540; rev:4;
    metadata:created_at 2013_03_06, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_23;
)

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