Potential Microsoft Office Sandbox Evasion

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: 3

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

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

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Virtualization/Sandbox Evasion
- ID: T1497
- Reference URL: https://attack.mitre.org/techniques/T1497/

« Modification of Environment Variable via Launchctl TCC Bypass via Mounted APFS Snapshot Access »