IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
PowerShell Keylogging Script
editPowerShell Keylogging Script
editDetects the use of Win32 API Functions that can be used to capture user keystrokes in PowerShell scripts. Attackers use this technique to capture user input, looking for credentials and/or other valuable data.
Rule type: query
Rule indices:
- winlogbeat-*
- logs-windows.*
Severity: high
Risk score: 73
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Collection
Version: 3
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guide
edit## Triage and analysis. ### Investigating PowerShell Keylogging Script PowerShell is one of the main tools used by system administrators for automation, report routines, and other tasks. Attackers can abuse PowerShell capabilities to capture user keystrokes with the goal of stealing credentials and other valuable information as credit card data and confidential conversations. #### Possible investigation steps: - Examine script content that triggered the detection. - Investigate script execution chain (parent process tree). - Inspect any file or network events from the suspicious PowerShell host process instance. - If the action is suspicious for the user, check for any other activities done by the user in the last 48 hours. ### False Positive Analysis - Verify whether the script content is malicious/harmful. ### Related Rules - PowerShell PSReflect Script - 56f2e9b5-4803-4e44-a0a4-a52dc79d57fe ### Response and Remediation - Immediate response should be taken to validate, investigate, and potentially contain the activity to prevent further post-compromise behavior. ## Config The 'PowerShell Script Block Logging' logging policy must be enabled. Steps to implement the logging policy with with Advanced Audit Configuration: ``` Computer Configuration > Administrative Templates > Windows PowerShell > Turn on PowerShell Script Block Logging (Enable) ``` Steps to implement the logging policy via registry: ``` reg add "hklm\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging" /v EnableScriptBlockLogging /t REG_DWORD /d 1 ```
Rule query
editevent.category:process and ( powershell.file.script_block_text : (GetAsyncKeyState or NtUserGetAsyncKeyState or GetKeyboardState or Get-Keystrokes) or powershell.file.script_block_text : ((SetWindowsHookA or SetWindowsHookW or SetWindowsHookEx or SetWindowsHookExA or NtUserSetWindowsHookEx) and (GetForegroundWindow or GetWindowTextA or GetWindowTextW or WM_KEYBOARD_LL)) )
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Collection
- ID: TA0009
- Reference URL: https://attack.mitre.org/tactics/TA0009/
-
Technique:
- Name: Input Capture
- ID: T1056
- Reference URL: https://attack.mitre.org/techniques/T1056/
-
Sub-technique:
- Name: Keylogging
- ID: T1056.001
- Reference URL: https://attack.mitre.org/techniques/T1056/001/
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
-
Sub-technique:
- Name: PowerShell
- ID: T1059.001
- Reference URL: https://attack.mitre.org/techniques/T1059/001/