Sigma rule: High DNS Bytes Out - Firewall

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-59501e57a31f, updated 2023-03-24T00:00:00.000Z.

Rule

Title
High DNS Bytes Out - Firewall
Status
unsupported
Level
medium
Author
Daniil Yugoslavskiy, oscd.community
Date
2019/10/24
Modified
2023/03/24
File
unsupported/network/net_firewall_high_dns_bytes_out.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

High DNS queries bytes amount from host per short period of time

Log source

category
firewall

Detection

selection:
    dst_port: 53
timeframe: 1m
condition: selection | sum(message_size) by src_ip > 300000

False positives (as the rule lists them)

  • Legitimate high DNS bytes out rate to domain name which should be added to whitelist

Tags

  • attack.exfiltration
  • attack.t1048.003

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_firewall_high_dns_bytes_out.yml

Sources and licences

  • SigmaHQ

    "High DNS Bytes Out - Firewall" by Daniil Yugoslavskiy, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/network/net_firewall_high_dns_bytes_out.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 DNS Bytes Out - Firewall",
entity page, dataset version ref-59501e57a31f, updated 2023-03-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3b6e327d-8649-4102-993f-d25786481589 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3b6e327d-8649-4102-993f-d25786481589, 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.