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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Microsoft Build Engine Loading Windows Credential Libraries

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Microsoft Build Engine Loading Windows Credential Libraries

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An instance of MSBuild, the Microsoft Build Engine, loaded DLLs (dynamically linked libraries) responsible for Windows credential management. This technique is sometimes used for credential dumping.

Rule type: eql

Rule indices:

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

Severity: high

Risk score: 73

Runs every: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Credential Access

Version: 8 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 7.13.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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The Build Engine is commonly used by Windows developers but use by non-engineers is unusual.

Rule query

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sequence by process.entity_id [process where event.type == "start"
and (process.name : "MSBuild.exe" or process.pe.original_file_name ==
"MSBuild.exe")] [library where dll.name : ("vaultcli.dll",
"SAMLib.DLL")]

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/

Rule version history

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Version 8 (7.13.0 release)

Updated query, changed from:

event.category:process and event.type:change and
(process.pe.original_file_name:(vaultcli.dll or SAMLib.DLL) or
dll.name:(vaultcli.dll or SAMLib.DLL)) and process.name: MSBuild.exe

Version 7 (7.12.0 release)

Formatting only

Version 6 (7.11.2 release)

Formatting only

Version 5 (7.11.0 release)

Updated query, changed from:

event.category:process and event.type:change and
(winlog.event_data.OriginalFileName:(vaultcli.dll or SAMLib.DLL) or
dll.name:(vaultcli.dll or SAMLib.DLL)) and process.name: MSBuild.exe

Version 4 (7.10.0 release)

Formatting only

Version 3 (7.9.1 release)

Formatting only

Version 2 (7.9.0 release)

Updated query, changed from:

(winlog.event_data.OriginalFileName: (vaultcli.dll or SAMLib.DLL) or
dll.name: (vaultcli.dll or SAMLib.DLL)) and process.name: MSBuild.exe
and event.action: "Image loaded (rule: ImageLoad)"

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