Executable File Download via Wget

Detects executable file downloads via wget to suspicious locations such as /tmp or /Users/Shared. Threat actors commonly use wget to download malicious payloads and additional tools for post-exploitation.

Rule type: eql
Rule indices:

• logs-endpoint.events.network-*
• logs-endpoint.events.file-*

Rule Severity: medium
Risk Score: 47
Runs every:
Searches indices from: now-9m
Maximum alerts per execution: ?
References:

• https://attack.mitre.org/techniques/T1105/

Tags:

• Domain: Endpoint
• OS: macOS
• Use Case: Threat Detection
• Tactic: Command and Control
• Data Source: Elastic Defend

Version: ?
Rule authors:

• Elastic

Rule license: Elastic License v2

sequence by process.entity_id with maxspan=30s
  [network where host.os.type == "macos" and event.type == "start" and process.name == "wget"]
  [file where host.os.type == "macos" and event.action == "modification" and
    process.name == "wget" and
    file.path like ("/tmp/*", "/private/tmp/*", "/private/var/tmp/*", "/var/tmp/*", "/Users/Shared/*") and
    file.Ext.header_bytes like~ ("cffaedfe*", "cafebabe*")]
		

Framework: MITRE ATT&CK

• Tactic:

  • Name: Command and Control
  • Id: TA0011
  • Reference URL: https://attack.mitre.org/tactics/TA0011/

• Technique:

  • Name: Ingress Tool Transfer
  • Id: T1105
  • Reference URL: https://attack.mitre.org/techniques/T1105/

Framework: MITRE ATT&CK

• Tactic:

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

• Technique:

  • Name: User Execution
  • Id: T1204
  • Reference URL: https://attack.mitre.org/techniques/T1204/

• Sub Technique:

  • Name: Malicious File
  • Id: T1204.002
  • Reference URL: https://attack.mitre.org/techniques/T1204/002/