Potential Microsoft Office Sandbox Evasion

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Identifies the creation of a suspicious zip file prepended with special characters. Sandboxed Microsoft Office applications on macOS are allowed to write files that start with special characters, which can be combined with an AutoStart location to achieve sandbox evasion.

Rule type: query

Rule indices:

  • auditbeat-*
  • logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • macOS
  • Threat Detection
  • Defense Evasion

Version: 101

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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event.category:file and not event.type:deletion and file.name:~$*.zip and host.os.type:macos

Framework: MITRE ATT&CKTM