Sigma Rule Library

Nslookup PowerShell Download Cradle - ProcessCreation

Detects suspicious powershell download cradle using nslookup. This cradle uses nslookup to extract payloads from DNS records

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Detection logic

selection_img

- Image|contains: \nslookup.exe
- OriginalFileName: \nslookup.exe

selection_cmd

ParentImage|endswith:
  - \powershell.exe
  - \pwsh.exe
CommandLine|contains:
  - " -q=txt "
  - " -querytype=txt "

Condition

all of selection_*

Raw YAML

title: Nslookup PowerShell Download Cradle - ProcessCreation
id: 1b3b01c7-84e9-4072-86e5-fc285a41ff23
related:
    - id: 72671447-4352-4413-bb91-b85569687135
      type: obsolete
    - id: 999bff6d-dc15-44c9-9f5c-e1051bfc86e1
      type: similar
status: test
description: Detects suspicious powershell download cradle using nslookup. This cradle uses nslookup to extract payloads from DNS records
references:
    - https://twitter.com/Alh4zr3d/status/1566489367232651264
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-05
modified: 2022-12-19
tags:
    - attack.stealth
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|contains: '\nslookup.exe'
        - OriginalFileName: '\nslookup.exe'
    selection_cmd:
        ParentImage|endswith:
            - '\powershell.exe'
            - '\pwsh.exe'
        CommandLine|contains:
            - ' -q=txt '
            - ' -querytype=txt '
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

False positives

  • Unknown

References

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