ET EXPLOIT Possible Zerologon Phase 1/3 - NetrServerReqChallenge with 0x00 Client Challenge (CVE-2020-1472)

Query · suricata

flow:established,to_server;
flowbits:isset,dcerpc.rpcnetlogon;
flowbits:isnotset,dcerpc.rpcnetlogon.netrsrvreqchal.nullcc;
flowbits:set,dcerpc.rpcnetlogon.netrsrvreqchal.nullcc;
content:"|05 00 00|"; startswith; fast_pattern;
content:"|04 00|"; offset:22; depth:2;
content:"|00 00 00 00 00 00 00 00|"; endswith;
threshold:type limit, count 1, seconds 30, track by_src;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Excludes

  • dcerpc.rpcnetlogon.netrsrvreqchal.nullcc — excluded, not a dependency

Feeds into

  • 5 rules read dcerpc.rpcnetlogon.netrsrvreqchal.nullcc · view all
Raw source ET EXPLOIT Possible Zerologon Phase 1/3 - NetrServerReqChallenge with 0x00 Client Challenge (CVE-2020-1472) · 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-pkt any any -> [$HTTP_SERVERS,$HOME_NET] 1024: (
    msg:"ET EXPLOIT Possible Zerologon Phase 1/3 - NetrServerReqChallenge with 0x00 Client Challenge (CVE-2020-1472)";
    flow:established,to_server;
    flowbits:isset,dcerpc.rpcnetlogon;
    flowbits:isnotset,dcerpc.rpcnetlogon.netrsrvreqchal.nullcc;
    flowbits:set,dcerpc.rpcnetlogon.netrsrvreqchal.nullcc;
    content:"|05 00 00|"; startswith; fast_pattern;
    content:"|04 00|"; offset:22; depth:2;
    content:"|00 00 00 00 00 00 00 00|"; endswith;
    threshold:type limit, count 1, seconds 30, track by_src;
    reference:url,www.secura.com/blog/zero-logon;
    reference:cve,2020-1472;
    reference:url,thedfirreport.com/2022/02/21/qbot-and-zerologon-lead-to-full-domain-compromise/;
    classtype:attempted-admin;
    sid:2030870; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Server, created_at 2020_09_14, cve CVE_2020_1472, deployment Perimeter, deployment Internal, performance_impact Significant, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_22;
)

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