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&CKTM