PowerShell Script With File Hostname Resolving Capabilities

Description

Detects PowerShell scripts that have capabilities to read files, loop through them and resolve DNS host entries.

Query · sigma

selection:
  ScriptBlockText|contains|all:
  - 'Get-content '
  - foreach
  - '[System.Net.Dns]::GetHostEntry'
  - Out-File
condition: selection

Known false positives

  • The same functionality can be implemented by admin scripts, correlate with name and creator
Raw source PowerShell Script With File Hostname Resolving Capabilities · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: PowerShell Script With File Hostname Resolving Capabilities
id: fbc5e92f-3044-4e73-a5c6-1c4359b539de
status: test
description: Detects PowerShell scripts that have capabilities to read files, loop through them and resolve DNS host entries.
references:
    - https://www.fortypoundhead.com/showcontent.asp?artid=24022
    - https://labs.withsecure.com/publications/fin7-target-veeam-servers
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-05
tags:
    - attack.exfiltration
    - attack.t1020
logsource:
    product: windows
    category: ps_script
    definition: bade5735-5ab0-4aa7-a642-a11be0e40872
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'Get-content '
            - 'foreach'
            - '[System.Net.Dns]::GetHostEntry'
            - 'Out-File'
    condition: selection
falsepositives:
    - The same functionality can be implemented by admin scripts, correlate with name and creator
level: medium

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