ET EXPLOIT Possible JNBridge Java Deserialization Attempt (Wide) M1

Query · suricata

flow:established,to_server;
content:"JNB"; startswith;
pcre:"/^\d[012345]/R";
content:"r|00|u|00|n|00|C|00|o|00|m|00|m|00|a|00|n|00|d"; fast_pattern;
Raw source ET EXPLOIT Possible JNBridge Java Deserialization Attempt (Wide) M1 · Suricata
Esc
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 EXPLOIT Possible JNBridge Java Deserialization Attempt (Wide) M1";
    flow:established,to_server;
    content:"JNB"; startswith;
    pcre:"/^\d[012345]/R";
    content:"r|00|u|00|n|00|C|00|o|00|m|00|m|00|a|00|n|00|d"; fast_pattern;
    classtype:attempted-admin;
    sid:2033850; rev:1;
    metadata:attack_target Server, created_at 2021_08_31, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, updated_at 2021_08_31, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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