IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Base16 or Base32 Encoding/Decoding Activity

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Base16 or Base32 Encoding/Decoding Activity

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Adversaries may encode/decode data in an attempt to evade detection by host- or network-based security controls.

Rule type: query

Rule indices:

auditbeat-*
logs-endpoint.events.*
endgame-*

Severity: low

Risk score: 21

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: Linux
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Endgame
Data Source: Elastic Defend

Version: 106

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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event.category:process and host.os.type:linux and event.type:(start or process_started) and
  process.name:(base16 or base32 or base32plain or base32hex)

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Obfuscated Files or Information
- ID: T1027
- Reference URL: https://attack.mitre.org/techniques/T1027/
Technique:
- Name: Deobfuscate/Decode Files or Information
- ID: T1140
- Reference URL: https://attack.mitre.org/techniques/T1140/

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