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Detection rules › Sigma

Potential Registry Reconnaissance Via PowerShell Script

Status
test
Severity
medium
Log source
product windows, category ps_script
Author
frack113
Source
github.com/SigmaHQ/sigma

Detects PowerShell scripts with potential registry reconnaissance capabilities. Adversaries may interact with the Windows registry to gather information about the system credentials, configuration, and installed software.

MITRE ATT&CK coverage

TacticTechniques
DiscoveryT1007 System Service Discovery, T1012 Query Registry

Event coverage

ProviderEventTitle
PowerShellEvent ID 4104Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body yaml

title: Potential Registry Reconnaissance Via PowerShell Script
id: 064060aa-09fb-4636-817f-020a32aa7e9e
related:
    - id: 970007b7-ce32-49d0-a4a4-fbef016950bd
      type: similar
status: test
description: Detects PowerShell scripts with potential registry reconnaissance capabilities. Adversaries may interact with the Windows registry to gather information about the system credentials, configuration, and installed software.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1012/T1012.md
author: frack113
date: 2023-07-02
tags:
    - attack.discovery
    - attack.t1012
    - attack.t1007
    - detection.threat-hunting
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        # TODO: switch to |re|i: after sigma specification v2 is released
        ScriptBlockText|re: '(Get-Item|gci|Get-ChildItem).{1,64}-Path.{1,64}\\(currentcontrolset\\services|CurrentVersion\\Policies\\Explorer\\Run|CurrentVersion\\Run|CurrentVersion\\ShellServiceObjectDelayLoad|CurrentVersion\\Windows\winlogon)\\'
    condition: selection
falsepositives:
    - Due to the nature of the script block, the matching of the string could sometimes result in a false positive. Use this rule to hunt for potential malicious or suspicious scripts.
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|re: '(Get-Item|gci|Get-ChildItem).{1,64}-Path.{1,64}\\(currentcontrolset\\services|CurrentVersion\\Policies\\Explorer\\Run|CurrentVersion\\Run|CurrentVersion\\ShellServiceObjectDelayLoad|CurrentVersion\\Windows\winlogon)\\'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ScriptBlockTextregex_match
  • (Get-Item|gci|Get-ChildItem).{1,64}-Path.{1,64}\(currentcontrolset\services|CurrentVersion\Policies\Explorer\Run|CurrentVersion\Run|CurrentVersion\ShellServiceObjectDelayLoad|CurrentVersion\Windows\winlogon)\