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

« Persistent Scripts in the Startup Directory Suspicious Image Load (taskschd.dll) from MS Office »

› ›

Component Object Model Hijacking

edit

Component Object Model Hijacking

edit

Identifies Component Object Model (COM) hijacking via registry modification. Adversaries may establish persistence by executing malicious content triggered by hijacked references to COM objects.

Rule type: eql

Rule indices:

logs-endpoint.events.*

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:

https://bohops.com/2018/08/18/abusing-the-com-registry-structure-part-2-loading-techniques-for-evasion-and-persistence/

Tags:

Elastic
Host
Windows
Threat Detection
Persistence

Version: 6

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

registry where
 /* uncomment once length is stable length(bytes_written_string) > 0 and */
 (registry.path : "HK*}\\InprocServer32\\" and registry.data.strings: ("scrobj.dll", "C:\\*\\scrobj.dll") and
 not registry.path : "*\\{06290BD*-48AA-11D2-8432-006008C3FBFC}\\*")
 or
 /* in general COM Registry changes on Users Hive is less noisy and worth alerting */
 (registry.path : ("HKEY_USERS\\*Classes\\*\\InprocServer32\\",
                   "HKEY_USERS\\*Classes\\*\\LocalServer32\\",
                   "HKEY_USERS\\*Classes\\*\\DelegateExecute\\",
                   "HKEY_USERS\\*Classes\\*\\TreatAs\\",
                   "HKEY_USERS\\*Classes\\CLSID\\*\\ScriptletURL\\") and
 not (process.executable : "?:\\Program Files*\\Veeam\\Backup and Replication\\Console\\veeam.backup.shell.exe" and
      registry.path : "HKEY_USERS\\S-1-5-21-*_Classes\\CLSID\\*\\LocalServer32\\") and
 /* not necessary but good for filtering privileged installations */
 user.domain != "NT AUTHORITY")

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: Component Object Model Hijacking
- ID: T1546.015
- Reference URL: https://attack.mitre.org/techniques/T1546/015/

« Persistent Scripts in the Startup Directory Suspicious Image Load (taskschd.dll) from MS Office »