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Encoded Executable Stored in the Registry

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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&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Modify Registry
- ID: T1112
- Reference URL: https://attack.mitre.org/techniques/T1112/
Technique:
- Name: Deobfuscate/Decode Files or Information
- ID: T1140
- Reference URL: https://attack.mitre.org/techniques/T1140/

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