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Persistence via Hidden Run Key Detected

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Persistence via Hidden Run Key Detected

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Identifies a persistence mechanism that utilizes the NtSetValueKey native API to create a hidden (null terminated) registry key. An adversary may use this method to hide from system utilities such as the Registry Editor (regedit).

Rule type: eql

Rule indices:

logs-endpoint.events.*
winlogbeat-*
logs-windows.sysmon_operational-*
endgame-*

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:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Persistence
Tactic: Defense Evasion
Tactic: Execution
Data Source: Elastic Endgame
Data Source: Elastic Defend
Data Source: Sysmon

Version: 107

Rule authors:

Elastic

Rule license: Elastic License v2

Setup

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Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define event.ingested and default fallback for EQL rules was not added until version 8.2. Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate event.ingested to @timestamp. For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html

Rule query

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/* Registry Path ends with backslash */
registry where host.os.type == "windows" and /* length(registry.data.strings) > 0 and */
 registry.path : ("HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "HKU\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "HKLM\\Software\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\",
                  "HKU\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\",
                  "\\REGISTRY\\MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\",
                  "\\REGISTRY\\USER\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "\\REGISTRY\\MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "\\REGISTRY\\MACHINE\\Software\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Run\\",
                  "\\REGISTRY\\USER\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\",
                  "\\REGISTRY\\MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Boot or Logon Autostart Execution
- ID: T1547
- Reference URL: https://attack.mitre.org/techniques/T1547/
Sub-technique:
- Name: Registry Run Keys / Startup Folder
- ID: T1547.001
- Reference URL: https://attack.mitre.org/techniques/T1547/001/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Native API
- ID: T1106
- Reference URL: https://attack.mitre.org/techniques/T1106/
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Modify Registry
- ID: T1112
- Reference URL: https://attack.mitre.org/techniques/T1112/

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