DNS TXT Answer with Possible Execution Strings

testhigh
log source: dnsauthor Markus Neisdate 2018-08-08
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description

What this is, in brief.

Detects strings used in command execution in DNS TXT Answer

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tags

attack.command-and-controlattack.t1071.004
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rule source (YAML)

title: DNS TXT Answer with Possible Execution Strings
id: 8ae51330-899c-4641-8125-e39f2e07da72
status: test
description: Detects strings used in command execution in DNS TXT Answer
references:
    - https://twitter.com/stvemillertime/status/1024707932447854592
    - https://github.com/samratashok/nishang/blob/414ee1104526d7057f9adaeee196d91ae447283e/Backdoors/DNS_TXT_Pwnage.ps1
author: Markus Neis
date: 2018-08-08
modified: 2021-11-27
tags:
    - attack.command-and-control
    - attack.t1071.004
logsource:
    category: dns
detection:
    selection:
        record_type: 'TXT'
        answer|contains:
            - 'IEX'
            - 'Invoke-Expression'
            - 'cmd.exe'
    condition: selection
falsepositives:
    - Unknown
level: high
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detects techniques (1)

ATT&CK techniques this enables or maps to.

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references

External citations — patches, advisories, analysis.