Detection rules › Sigma
Powershell Keylogging
Adversaries may log user keystrokes to intercept credentials as the user types them.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access | |
| Collection |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| PowerShell | Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body
title: Powershell Keylogging
id: 34f90d3c-c297-49e9-b26d-911b05a4866c
status: test
description: Adversaries may log user keystrokes to intercept credentials as the user types them.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218/T1218.md
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1056.001/src/Get-Keystrokes.ps1
author: frack113
date: 2021-07-30
modified: 2022-07-11
tags:
- attack.credential-access
- attack.collection
- attack.t1056.001
logsource:
product: windows
category: ps_script
definition: 'Requirements: Script Block Logging must be enabled'
detection:
selection_basic:
ScriptBlockText|contains: 'Get-Keystrokes'
selection_high: # want to run in background and keyboard
ScriptBlockText|contains|all:
- 'Get-ProcAddress user32.dll GetAsyncKeyState'
- 'Get-ProcAddress user32.dll GetForegroundWindow'
condition: 1 of selection_*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
1 of selection_*Stage 1: selection_basic
selection_basic:
ScriptBlockText|contains: 'Get-Keystrokes'
Stage 2: selection_high
selection_high:
ScriptBlockText|contains|all:
- 'Get-ProcAddress user32.dll GetAsyncKeyState'
- 'Get-ProcAddress user32.dll GetForegroundWindow'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ScriptBlockText | match |
| field:"ScriptBlockText" kind:match |