EggShell Backdoor Execution

Elastic Stack Serverless Security

Identifies the execution of and EggShell Backdoor. EggShell is a known post exploitation tool for macOS and Linux.

Rule type: query

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/neoneggplant/EggShell

Tags:

• Elastic
• Host
• Linux
• macOS
• Threat Detection
• Execution

Version: 3

Rule authors:

• Elastic

Rule license: Elastic License v2

event.category:process and event.type:(start or process_started) and process.name:espl and process.args:eyJkZWJ1ZyI6*

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Execution
  • ID: TA0002
  • Reference URL: https://attack.mitre.org/tactics/TA0002/

• Technique:

  • Name: Command and Scripting Interpreter
  • ID: T1059
  • Reference URL: https://attack.mitre.org/techniques/T1059/

• Sub-technique:

  • Name: Python
  • ID: T1059.006
  • Reference URL: https://attack.mitre.org/techniques/T1059/006/