thetech org js

Hunt Hypothesis

The hypothesis is that the detected JavaScript code may be used by adversaries to execute arbitrary commands or exfiltrate data, leveraging the thetech.org domain for C2. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential compromise of internal systems through malicious script execution.

YARA Rule

rule thetech_org_js {
    strings: $ = "|RegExp|onepage|checkout|"
    condition: any of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints
• Source Rule

False Positive Guidance

• Scenario: Legitimate JavaScript file from a third-party library
  Description: A JavaScript file from a known third-party library (e.g., jQuery, Bootstrap, or Lodash) is being deployed as part of a web application.
  Filter/Exclusion: Check the file’s source or hash against a known good list of trusted libraries (e.g., using a file integrity management system or a whitelisted repository).

• Scenario: Scheduled job running a JavaScript script for system maintenance
  Description: A scheduled job (e.g., using cron or Task Scheduler) runs a JavaScript script to perform routine maintenance, such as log rotation or system cleanup.
  Filter/Exclusion: Exclude files executed by known system or maintenance processes, or use process owner filtering (e.g., process.owner == "system" or process.owner == "admin").

• Scenario: Admin task using Node.js for configuration management
  Description: An administrator is using Node.js to manage configuration files or deploy updates across the network (e.g., using npm or a custom script).
  Filter/Exclusion: Filter based on the user context (e.g., user == "admin") or check for known administrative tools in the execution path.

• Scenario: Development environment using JavaScript for testing
  Description: A developer is running a JavaScript test script (e.g., using Mocha or Jest) as part of a CI/CD pipeline or local testing.
  Filter/Exclusion: Exclude files located in development directories (e.g., /var/www/dev/, /home/user/projects/) or filter by process name (e.g., process.name == "mocha").

• Scenario: Legacy system using old JavaScript for internal operations
  Description: An older system or legacy application uses outdated JavaScript files for internal operations (e.g., a custom reporting