Prompt for Credentials with OSASCRIPT

Elastic Stack Serverless Security

Identifies the use of osascript to execute scripts via standard input that may prompt a user for credentials with a rogue dialog.

Rule type: eql

Rule indices:

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

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://github.com/EmpireProject/EmPyre/blob/master/lib/modules/collection/osx/prompt.py
• https://ss64.com/osx/osascript.html

Tags:

• Elastic
• Host
• macOS
• Threat Detection
• Credential Access

Version: 4

Rule authors:

• Elastic

Rule license: Elastic License v2

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define event.ingested and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate event.ingested to @timestamp for this rule to work.

process where event.type in ("start", "process_started") and process.name : "osascript" and
 process.command_line : "osascript*display dialog*password*"

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Credential Access
  • ID: TA0006
  • Reference URL: https://attack.mitre.org/tactics/TA0006/

• Technique:

  • Name: Input Capture
  • ID: T1056
  • Reference URL: https://attack.mitre.org/techniques/T1056/

• Sub-technique:

  • Name: GUI Input Capture
  • ID: T1056.002
  • Reference URL: https://attack.mitre.org/techniques/T1056/002/