ET HUNTING Possible Apache log4j RCE Attempt - Any Protocol (lower TCP Bypass) (CVE-2021-44228)

Query · suricata

flow:established,to_server;
content:"|24 7b|lower|3a|j"; nocase; fast_pattern;
content:"n"; distance:0; within:12;
content:"d"; distance:0; within:12;
content:"i"; distance:0; within:12;
Raw source ET HUNTING Possible Apache log4j RCE Attempt - Any Protocol (lower TCP Bypass) (CVE-2021-44228) · 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 tcp any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET HUNTING Possible Apache log4j RCE Attempt - Any Protocol (lower TCP Bypass) (CVE-2021-44228)";
    flow:established,to_server;
    content:"|24 7b|lower|3a|j"; nocase; fast_pattern;
    content:"n"; distance:0; within:12;
    content:"d"; distance:0; within:12;
    content:"i"; distance:0; within:12;
    reference:cve,2021-44228;
    classtype:attempted-admin;
    sid:2034808; rev:1;
    metadata:created_at 2021_12_20, cve CVE_2021_44228, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_20;
)

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