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We have not been able to test, simulate or build datasets for it, use at your own risk!

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Description

The search is used to identify attempts to use your DNS Infrastructure for DDoS purposes via a DNS amplification attack leveraging ANY queries.

  • Type: Anomaly
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Network_Resolution
  • Last Updated: 2017-09-20
  • Author: Bhavin Patel, Splunk
  • ID: 8fa891f7-a533-4b3c-af85-5aa2e7c1f1eb

ATT&CK

ID Technique Tactic
T1498 Network Denial of Service Impact
T1498.002 Reflection Amplification Impact

| tstats `security_content_summariesonly` count from datamodel=Network_Resolution where nodename=DNS "DNS.message_type"="QUERY" "DNS.record_type"="ANY" by "DNS.dest" 
| `drop_dm_object_name("DNS")` 
| where count>200 
| `large_volume_of_dns_any_queries_filter`

Associated Analytic Story

How To Implement

To successfully implement this search you must ensure that DNS data is populating the Network_Resolution data model.

Required field

  • _time
  • DNS.message_type
  • DNS.record_type
  • DNS.dest

Kill Chain Phase

  • Actions on Objectives

Known False Positives

Legitimate ANY requests may trigger this search, however it is unusual to see a large volume of them under typical circumstances. You may modify the threshold in the search to better suit your environment.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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