Elastic Security Detection Rules

Abnormally Large DNS Response

Last updated a year ago on 2024-05-21
Created 5 years ago on 2020-07-16

About

Specially crafted DNS requests can manipulate a known overflow vulnerability in some Windows DNS servers, resulting in Remote Code Execution (RCE) or a Denial of Service (DoS) from crashing the service.
Tags
Use Case: Threat DetectionTactic: Lateral MovementUse Case: VulnerabilityLanguage: kuery
Severity
medium
Risk Score
47
MITRE ATT&CK™

Lateral Movement (TA0008)(opens in a new tab or window)

↳ Exploitation of Remote Services (T1210)(opens in a new tab or window)

False Positive Examples
Environments that leverage DNS responses over 60k bytes will result in false positives - if this traffic is predictable and expected, it should be filtered out. Additionally, this detection rule could be triggered by an authorized vulnerability scan or compromise assessment.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Query (Kibana Query Language)
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
packetbeat-*filebeat-*logs-network_traffic.*
Related Integrations

network_traffic(opens in a new tab or window)

Query
(event.dataset: network_traffic.dns or (event.category: (network or network_traffic) and destination.port: 53)) and
  (event.dataset:zeek.dns or type:dns or event.type:connection) and network.bytes > 60000

Install detection rules in Elastic Security

Detect Abnormally Large DNS Response in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).