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Executable File Creation with Multiple Extensions

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Executable File Creation with Multiple Extensions

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Masquerading can allow an adversary to evade defenses and better blend in with the environment. One way it occurs is when the name or location of a file is manipulated as a means of tricking a user into executing what they think is a benign file type but is actually executable code.

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

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file where event.type == "creation" and file.extension:"exe" and
file.name: ( "*.vbs.exe", "*.vbe.exe", "*.bat.exe",
"*.js.exe", "*.cmd.exe", "*.wsh.exe", "*.ps1.exe",
"*.pdf.exe", "*.docx.exe", "*.doc.exe", "*.xlsx.exe",
"*.xls.exe", "*.pptx.exe", "*.ppt.exe", "*.txt.exe",
"*.rtf.exe", "*.gif.exe", "*.jpg.exe", "*.png.exe",
"*.bmp.exe", "*.hta.exe", "*.txt.exe", "*.img.exe",
"*.iso.exe" )

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: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/

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