Powershell DNSExfiltration

Description

DNSExfiltrator allows for transferring (exfiltrate) a file over a DNS request covert channel

Query · sigma

selection_cmdlet:
- ScriptBlockText|contains: Invoke-DNSExfiltrator
- ScriptBlockText|contains|all:
  - ' -i '
  - ' -d '
  - ' -p '
  - ' -doh '
  - ' -t '
condition: selection_cmdlet

Known false positives

  • Legitimate script
Raw source Powershell DNSExfiltration · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Powershell DNSExfiltration
id: d59d7842-9a21-4bc6-ba98-64bfe0091355
status: test
description: DNSExfiltrator allows for transferring (exfiltrate) a file over a DNS request covert channel
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1048/T1048.md#atomic-test-3---dnsexfiltration-doh
    - https://github.com/Arno0x/DNSExfiltrator
author: frack113
date: 2022-01-07
tags:
    - attack.exfiltration
    - attack.t1048
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_cmdlet:
        - ScriptBlockText|contains: 'Invoke-DNSExfiltrator'
        - ScriptBlockText|contains|all:
              - ' -i '
              - ' -d '
              - ' -p '
              - ' -doh '
              - ' -t '
    condition: selection_cmdlet
falsepositives:
    - Legitimate script
level: high

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