WARNING THIS IS A EXPERIMENTAL object

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

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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

Annotations

ATT&CK
ID Technique Tactic
T1498 Network Denial of Service Impact
T1498.002 Reflection Amplification Impact
Kill Chain Phase
  • Actions on Objectives
NIST
  • PR.PT
  • DE.AE
  • PR.IP
CIS20
  • CIS 11
  • CIS 12
CVE
1
2
3
4
5
| 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`

Macros

The SPL above uses the following Macros:

Note that large_volume_of_dns_any_queries_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

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

How To Implement

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

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.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
25.0 50 50 tbd

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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