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Alternate Data Stream Creation/Execution at Volume Root Directory

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Alternate Data Stream Creation/Execution at Volume Root Directory

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Identifies the creation of an Alternate Data Stream (ADS) at a volume root directory, which can indicate the attempt to hide tools and malware, as ADSs created in this directory are not displayed by system utilities.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.process-*
logs-endpoint.events.file-*
logs-windows.sysmon_operational-*

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://www.crowdstrike.com/blog/anatomy-of-alpha-spider-ransomware/

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Defend
Data Source: Sysmon

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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any where host.os.type == "windows" and event.category in ("file", "process") and
  (
    (event.type == "creation" and file.path regex~ """[A-Z]:\\:.+""") or
    (event.type == "start" and process.executable regex~ """[A-Z]:\\:.+""")
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Hide Artifacts
- ID: T1564
- Reference URL: https://attack.mitre.org/techniques/T1564/
Sub-technique:
- Name: NTFS File Attributes
- ID: T1564.004
- Reference URL: https://attack.mitre.org/techniques/T1564/004/

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