Detection rules › Sigma
Powershell Directory Enumeration
Detects technique used by MAZE ransomware to enumerate directories using Powershell
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Discovery | T1083 File and Directory Discovery |
Event coverage
| Provider | Event | Title |
|---|---|---|
| PowerShell | Event ID 4104 | Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body yaml
title: Powershell Directory Enumeration
id: 162e69a7-7981-4344-84a9-0f1c9a217a52
status: test
description: Detects technique used by MAZE ransomware to enumerate directories using Powershell
references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1083/T1083.md
- https://www.mandiant.com/resources/tactics-techniques-procedures-associated-with-maze-ransomware-incidents
author: frack113
date: 2022-03-17
tags:
- attack.discovery
- attack.t1083
logsource:
product: windows
category: ps_script
definition: 'Requirements: Script Block Logging must be enabled'
detection:
selection:
ScriptBlockText|contains|all:
- foreach
- Get-ChildItem
- '-Path '
- '-ErrorAction '
- SilentlyContinue
- 'Out-File '
- '-append'
condition: selection
falsepositives:
- Legitimate PowerShell scripts
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
ScriptBlockText|contains|all:
- foreach
- Get-ChildItem
- '-Path '
- '-ErrorAction '
- SilentlyContinue
- 'Out-File '
- '-append'
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.
| Field | Kind | Values |
|---|---|---|
ScriptBlockText | match |
|