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Unusual File Creation - Alternate Data Stream

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Unusual File Creation - Alternate Data Stream

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Identifies suspicious creation of Alternate Data Streams on highly targeted files. This is uncommon for legitimate files and sometimes done by adversaries to hide malware.

Rule type: eql

Rule indices:

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

Severity: medium

Risk score: 47

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
Defense Evasion

Version: 4 (version history)

Added (Elastic Stack release): 7.12.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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file where event.type == "creation" and file.path : "C:\\*:*" and
not file.path : "C:\\*:zone.identifier*" and file.extension : (
"pdf", "dll", "png", "exe", "dat",
"com", "bat", "cmd", "sys", "vbs",
"ps1", "hta", "txt", "vbe", "js", "wsh",
"docx", "doc", "xlsx", "xls", "pptx",
"ppt", "rtf", "gif", "jpg", "png",
"bmp", "img", "iso" )

Threat mapping

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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/

Rule version history

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Version 4 (8.4.0 release)

Formatting only

Version 2 (8.2.0 release)

Formatting only

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