ET EXPLOIT Apache log4j RCE Attempt (http) (Outbound) (CVE-2021-44228)

Query · suricata

flow:established,to_server;
http.uri;
content:"|2f 24 7b 24 7b|"; startswith; fast_pattern;
content:"|3a 2d|j|7d 24 7b|";
content:"|3a 2d|n|7d 24 7b|";
content:"|3a 2d|d|7d 24 7b|";
content:"|3a 2d|i|7d 24 7b|";
content:"|3a 2d 3a 7d 24 7b|";
Raw source ET EXPLOIT Apache log4j RCE Attempt (http) (Outbound) (CVE-2021-44228) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> any any (
    msg:"ET EXPLOIT Apache log4j RCE Attempt (http) (Outbound) (CVE-2021-44228)";
    flow:established,to_server;
    http.uri;
    content:"|2f 24 7b 24 7b|"; startswith; fast_pattern;
    content:"|3a 2d|j|7d 24 7b|";
    content:"|3a 2d|n|7d 24 7b|";
    content:"|3a 2d|d|7d 24 7b|";
    content:"|3a 2d|i|7d 24 7b|";
    content:"|3a 2d 3a 7d 24 7b|";
    reference:url,lunasec.io/docs/blog/log4j-zero-day;
    reference:cve,2021-44228;
    classtype:attempted-admin;
    sid:2045125; rev:1;
    metadata:attack_target Server, created_at 2023_04_21, cve CVE_2021_44228, deployment Perimeter, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_21;
)

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