IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Registry Persistence via AppCert DLL

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Registry Persistence via AppCert DLL

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Detects attempts to maintain persistence by creating registry keys using AppCert DLLs. AppCert DLLs are loaded by every process using the common API functions to create processes.

Rule type: eql

Rule indices:

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

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Persistence
Tactic: Privilege Escalation
Data Source: Elastic Endgame
Data Source: Elastic Defend
Data Source: Sysmon
Data Source: SentinelOne

Version: 209

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 where host.os.type == "windows" and
/* uncomment once stable length(bytes_written_string) > 0 and */
  registry.path : (
    "HKLM\\SYSTEM\\*ControlSet*\\Control\\Session Manager\\AppCertDLLs\\*",
    "\\REGISTRY\\MACHINE\\SYSTEM\\*ControlSet*\\Control\\Session Manager\\AppCertDLLs\\*",
    "MACHINE\\SYSTEM\\*ControlSet*\\Control\\Session Manager\\AppCertDLLs\\*"
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Event Triggered Execution
- ID: T1546
- Reference URL: https://attack.mitre.org/techniques/T1546/
Sub-technique:
- Name: AppCert DLLs
- ID: T1546.009
- Reference URL: https://attack.mitre.org/techniques/T1546/009/
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Event Triggered Execution
- ID: T1546
- Reference URL: https://attack.mitre.org/techniques/T1546/
Sub-technique:
- Name: AppCert DLLs
- ID: T1546.009
- Reference URL: https://attack.mitre.org/techniques/T1546/009/

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