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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.*
endgame-*

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
Defense Evasion
Elastic Endgame

Version: 101 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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registry where /* update here with encoding combinations */
registry.data.strings : "TVqQAAMAAAAEAAAA*"

Threat mapping

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Framework: MITRE ATT&CK^TM

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

Rule version history

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Version 101 (8.6.0 release)

Formatting only

Version 100 (8.5.0 release)

Formatting only

Version 6 (8.4.0 release)

Formatting only

Version 5 (8.1.0 release)

Formatting only

Version 4 (7.16.0 release)

Formatting only

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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