Sigma rule: High NULL Records Requests Rate

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-309df6e83f78, updated 2023-03-24T00:00:00.000Z.

Rule

Title
High NULL Records Requests Rate
Status
unsupported
Level
medium
Author
Daniil Yugoslavskiy, oscd.community
Date
2019/10/24
Modified
2023/03/24
File
unsupported/network/net_dns_high_null_records_requests_rate.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Extremely high rate of NULL record type DNS requests from host per short period of time. Possible result of iodine tool execution

Log source

category
dns

Detection

selection:
    record_type: 'NULL'
timeframe: 1m
condition: selection | count() by src_ip > 50

False positives (as the rule lists them)

  • Legitimate high DNS NULL requests rate to domain name which should be added to whitelist

Tags

  • attack.exfiltration
  • attack.t1048.003
  • attack.command_and_control
  • attack.t1071.004

MITRE ATT&CK ids this rule names

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/network/net_dns_high_null_records_requests_rate.yml

Sources and licences

  • SigmaHQ

    "High NULL Records Requests Rate" by Daniil Yugoslavskiy, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/network/net_dns_high_null_records_requests_rate.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: High NULL Records Requests Rate",
entity page, dataset version ref-309df6e83f78, updated 2023-03-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/44ae5117-9c44-40cf-9c7c-7edad385ca70 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 44ae5117-9c44-40cf-9c7c-7edad385ca70, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.