blue-team-tools/rules/windows/process_creation/win_dnscat2_powershell_implementation.yml

title: DNSCat2 Powershell Implementation Detection Via Process Creation
id: b11d75d6-d7c1-11ea-87d0-0242ac130003
status: test
description: The PowerShell implementation of DNSCat2 calls nslookup to craft queries. Counting nslookup processes spawned by PowerShell will show hundreds or thousands of instances if PS DNSCat2 is active locally.
author: Cian Heasley
references:
  - https://github.com/lukebaggett/dnscat2-powershell
  - https://blu3-team.blogspot.com/2019/08/powershell-dns-c2-notes.html
  - https://ragged-lab.blogspot.com/2020/06/it-is-always-dns-powershell-edition.html
date: 2020/08/08
modified: 2021/11/27
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    ParentImage|endswith: '\powershell.exe'
    Image|endswith: '\nslookup.exe'
    CommandLine|endswith: '\nslookup.exe'
  condition: selection | count(Image) by ParentImage > 100
fields:
  - Image
  - CommandLine
  - ParentImage
falsepositives:
  - Other powershell scripts that call nslookup.exe
level: high
tags:
  - attack.command_and_control
  - attack.t1071
  - attack.t1071.004
  - attack.t1001.003
  - attack.t1041