Unusual File Creation - Alternate Data Streamedit
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: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References: None
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 2
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guideedit
## 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 queryedit
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"
)
Framework: MITRE ATT&CKTM
-
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/