IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Suspicious Portable Executable Encoded in Powershell Script

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Suspicious Portable Executable Encoded in Powershell Script

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Detects the presence of portable executables (PE) in a PowerShell script by looking for its encoded header. Attackers embed PEs into PowerShell scripts for injecting them into the memory, avoiding defenses by not writing to disk.

Rule type: query

Rule indices:

winlogbeat-*
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
Execution

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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event.category:process and
  powershell.file.script_block_text : (
    TVqQAAMAAAAEAAAA
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
Sub-technique:
- Name: PowerShell
- ID: T1059.001
- Reference URL: https://attack.mitre.org/techniques/T1059/001/

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