Powershell DNSExfiltration

testhigh
log source: windows · ps_scriptauthor frack113date 2022-01-07
01

description

What this is, in brief.

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

02

tags

attack.exfiltrationattack.t1048
03

rule source (YAML)

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
regression_tests_path: regression_data/rules/windows/powershell/powershell_script/posh_ps_invoke_dnsexfiltration/info.yml
04

detects techniques (1)

ATT&CK techniques this enables or maps to.

05

references

External citations — patches, advisories, analysis.