IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
« Unusual Executable File Creation by a System Critical Process Unusual File Modification by dns.exe »
Elastic Docs ›Elastic Security Solution [7.16] ›Detections and alerts ›Prebuilt rule reference

Unusual File Creation - Alternate Data Stream

edit

Unusual File Creation - Alternate Data Stream

edit

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: 1

Added (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

edit
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

edit

Framework: MITRE ATT&CKTM

« Unusual Executable File Creation by a System Critical Process Unusual File Modification by dns.exe »