ET ATTACK_RESPONSE Possible CVE-2021-44228 Payload via LDAPv3 Response M2

Query · suricata

flow:established,to_client;
content:"|30|"; startswith;
content:"|04 0d|javaClassName"; fast_pattern;
content:"|04|"; distance:2; within:1;
byte_jump:1,0,relative;
content:"|04 12|javaSerializedData"; within:25;
content:"|ac ed|"; within:10;
content:"|2e|exec"; distance:0;
content:"FromCharCode"; nocase; distance:0;
Raw source ET ATTACK_RESPONSE Possible CVE-2021-44228 Payload via LDAPv3 Response M2 · 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 $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET ATTACK_RESPONSE Possible CVE-2021-44228 Payload via LDAPv3 Response M2";
    flow:established,to_client;
    content:"|30|"; startswith;
    content:"|04 0d|javaClassName"; fast_pattern;
    content:"|04|"; distance:2; within:1;
    byte_jump:1,0,relative;
    content:"|04 12|javaSerializedData"; within:25;
    content:"|ac ed|"; within:10;
    content:"|2e|exec"; distance:0;
    content:"FromCharCode"; nocase; distance:0;
    reference:url,ldap.com/ldapv3-wire-protocol-reference-ldap-result/;
    reference:url,ldap.com/ldapv3-wire-protocol-reference-search/;
    reference:cve,2021-44228;
    classtype:attempted-admin;
    sid:2034769; rev:2;
    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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