ET EXPLOIT Possible Apache log4j RCE Attempt - 2021/12/12 Obfuscation Observed M2 (tcp) (Outbound) (CVE-2021-44228)

Query · suricata

flow:established,to_server;
stream_size:client,<,10000;
content:"|24 7b|";
content:"|24 7b 3a 3a|"; within:100; fast_pattern;
Raw source ET EXPLOIT Possible Apache log4j RCE Attempt - 2021/12/12 Obfuscation Observed M2 (tcp) (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 tcp $HOME_NET any -> any any (
    msg:"ET EXPLOIT Possible Apache log4j RCE Attempt - 2021/12/12 Obfuscation Observed M2 (tcp) (Outbound) (CVE-2021-44228)";
    flow:established,to_server;
    stream_size:client,<,10000;
    content:"|24 7b|";
    content:"|24 7b 3a 3a|"; within:100; fast_pattern;
    reference:cve,2021-44228;
    classtype:attempted-admin;
    sid:2034786; rev:3;
    metadata:attack_target Server, created_at 2021_12_17, cve CVE_2021_44228, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2022_01_11, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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