Base16 or Base32 Encoding/Decoding Activityedit

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

Rule type: query

Rule indices:

  • auditbeat-*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100


  • Elastic
  • Host
  • Linux
  • Threat Detection
  • Defense Evasion

Version: 7 (version history)

Added (Elastic Stack release): 7.8.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positivesedit

Automated tools such as Jenkins may encode or decode files as part of their normal behavior. These events can be filtered by the process executable or username values.

Rule queryedit

event.category:process and event.type:(start or process_started) and or base32 or base32plain or base32hex)

Threat mappingedit


Rule version historyedit

Version 7 (7.12.0 release)
  • Formatting only
Version 6 (7.11.2 release)
  • Formatting only
Version 5 (7.11.0 release)
  • Formatting only
Version 4 (7.10.0 release)
  • Formatting only
Version 3 (7.9.1 release)
  • Formatting only
Version 2 (7.9.0 release)
  • Updated query, changed from:

    event.action:(executed or process_started) and or
    base32 or base32plain or base32hex)