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Elastic Docs ›Elastic Security Solution [7.16] ›Detections and alerts ›Prebuilt rule reference

Suspicious Portable Executable Encoded in Powershell Script

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Suspicious Portable Executable Encoded in Powershell Script

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This rule detects the presence of Portable Executables 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: 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
  • Execution

Version: 1

Added (Elastic Stack release): 7.16.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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event.code:"4104" and powershell.file.script_block_text : (
TVqQAAMAAAAEAAAA )

Threat mapping

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Framework: MITRE ATT&CKTM

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