ET EXPLOIT Possible Apache log4j RCE Attempt - HTTP URI Obfuscation (CVE-2021-44228) (Inbound)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"|28 27 24 7b 24 7b|env|3a|"; depth:30; fast_pattern;
content:"|3a 2d|j|7d|ndi|24 7b|env|3a|"; distance:0;
content:"|2f|TomcatBypass|2f|Command|2f|Base64|2f|"; distance:0;
Raw source ET EXPLOIT Possible Apache log4j RCE Attempt - HTTP URI Obfuscation (CVE-2021-44228) (Inbound) · 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,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Possible Apache log4j RCE Attempt - HTTP URI Obfuscation (CVE-2021-44228) (Inbound)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"|28 27 24 7b 24 7b|env|3a|"; depth:30; fast_pattern;
    content:"|3a 2d|j|7d|ndi|24 7b|env|3a|"; distance:0;
    content:"|2f|TomcatBypass|2f|Command|2f|Base64|2f|"; distance:0;
    reference:url,isc.sans.edu/diary/rss/28246;
    reference:cve,2021-44228;
    classtype:attempted-admin;
    sid:2037046; rev:1;
    metadata:affected_product HTTP_Server, attack_target Server, created_at 2022_06_21, cve CVE_2021_44228, deployment Perimeter, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_21;
)

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