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Suspicious DLL Loaded for Persistence or Privilege Escalation

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Suspicious DLL Loaded for Persistence or Privilege Escalation

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Identifies the loading of a non Microsoft signed DLL that is missing on a default Windows install (phantom DLL) or one that can be loaded from a different location by a native Windows process. This may be abused to persist or elevate privileges via privileged file write vulnerabilities.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*
  • 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
  • Persistence
  • Privilege Escalation

Version: 4

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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## Config

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 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.

Rule query

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library where dll.name :
  (
  "wlbsctrl.dll",
  "wbemcomn.dll",
  "WptsExtensions.dll",
  "Tsmsisrv.dll",
  "TSVIPSrv.dll",
  "Msfte.dll",
  "wow64log.dll",
  "WindowsCoreDeviceInfo.dll",
  "Ualapi.dll",
  "wlanhlp.dll",
  "phoneinfo.dll",
  "EdgeGdi.dll",
  "cdpsgshims.dll",
  "windowsperformancerecordercontrol.dll",
  "diagtrack_win.dll"
  ) and
not (dll.code_signature.subject_name : ("Microsoft Windows", "Microsoft Corporation") and dll.code_signature.status : "trusted")

Framework: MITRE ATT&CKTM

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