Encoded Executable Stored in the Registry

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Identifies registry write modifications to hide an encoded portable executable. This could be indicative of adversary defense evasion by avoiding the storing of malicious content directly on disk.

Rule type: eql

Rule indices:

  • logs-endpoint.events.registry-*
  • endgame-*
  • logs-windows.sysmon_operational-*
  • logs-sentinel_one_cloud_funnel.*
  • winlogbeat-*

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:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend
  • Data Source: Sysmon
  • Data Source: SentinelOne

Version: 310

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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registry where host.os.type == "windows" and
/* update here with encoding combinations */
 registry.data.strings : "TVqQAAMAAAAEAAAA*"

Framework: MITRE ATT&CKTM