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Component Object Model Hijacking

Elastic Stack Serverless Security

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:

  • winlogbeat-*
  • logs-endpoint.events.*
  • logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Persistence

Version: 5

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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&CKTM