sigmahighHunting

DNS TXT Answer with Possible Execution Strings

Detects strings used in command execution in DNS TXT Answer

MITRE ATT&CK

command-and-control

Detection Query

selection:
  record_type: TXT
  answer|contains:
    - IEX
    - Invoke-Expression
    - cmd.exe
condition: selection

Author

Markus Neis

Created

2018-08-08

Data Sources

dns

References

Tags

attack.command-and-controlattack.t1071.004

Raw Content

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