IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
PowerShell MiniDump Script
editPowerShell MiniDump Script
editThis rule detects PowerShell scripts capable of dumping process memory using WindowsErrorReporting or Dbghelp.dll MiniDumpWriteDump. Attackers can use this tooling to dump LSASS and get access to credentials.
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
- Credential Access
Version: 5
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guide
edit## Triage and analysis. ### Investigating PowerShell MiniDump Script PowerShell is one of the main tools used by system administrators for automation, report routines, and other tasks. Process Memory Dump capabilities can be abused by attackers to extract credentials from LSASS or to obtain other privileged information stored in the process memory. #### 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 - Potential Process Injection via PowerShell - 2e29e96a-b67c-455a-afe4-de6183431d0d ### 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:(MiniDumpWriteDump or MiniDumpWithFullMemory or pmuDetirWpmuDiniM)
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/
-
Sub-technique:
- Name: LSASS Memory
- ID: T1003.001
- Reference URL: https://attack.mitre.org/techniques/T1003/001/
-
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/