JS-Tap v3 Endpoint Post-Exploitation With JavaScript Implant...

[carlospolop]

🤖 Automated Content Update

This PR was automatically generated by the HackTricks News Bot based on a technical blog post.

📝 Source Information

• Blog URL: https://trustedsec.com/blog/js-tap-v3-endpoint-post-exploitation-with-javascript-implants
• Blog Title: JS-Tap v3: Endpoint Post-Exploitation With JavaScript Implants
• Suggested Section: Pentesting Web > Browser Extension Pentesting Methodology; Network Services Pentesting > 80/443 > Electron Desktop Apps; Generic Hacking / Post-Exploitation; AI > AI Security or Phishing Methodology for Node/Bun preload implants against AI CLI tools

🎯 Content Summary

The post introduces JS-Tap v3, a JavaScript-based post-exploitation framework intended for authorized red team engagements and education. The original JS-Tap payload, now referred to as the DOM beacon, was designed as a generic JavaScript implant for web applications. Its original goal was to work without prior knowledge of the application and without requiring an already authenticated user: instrument the client side, collect loot, and attack the application...

🔧 Technical Details

Browser-extension privilege abuse for session theft: A JavaScript implant packaged as a browser extension runs above normal page JavaScript restrictions. Unlike a DOM implant or XSS payload, it can access browser-level data within its extension scope, including cookies across domains, httpOnly cookies, localStorage, sessionStorage, request headers, and tab activity. The general technique is to move from page-level execution to extension-level execution to bypass DOM security limitations such as inability to read protected cookies.

Extension-assisted DOM beacon injection and screenshot capture: A privileged browser extension can be used as a dropper to inject a lower-privileged DOM beacon into a selected domain loaded in the browser. Because the extension has APIs unavailable to page JavaScript, it can capture the rendered tab with captureVisibleTab instead of using client-side rendering libra...

🤖 Agent Actions

Done.

Updated:

• src/network-services-pentesting/pentesting-web/electron-desktop-apps/README.md

Added:

• A new section on ASAR/main-process post-exploitation implants
• Practical workflow for patching app.asar
• Main-process implant implications:
  • runtime/decrypted data theft
  • session/token abuse
  • victim-context proxy/pivoting
• A reference to the TrustedSec blog in the file’s ## References

Validation:

• Confirmed only the intended file changed
• Confirmed references section remains at the end and banner include is preserved
• mdbook build could not be run because mdbook is not installed in this environment

---

This PR was automatically created by the HackTricks Feed Bot. Please review the changes carefully before merging.

[carlospolop]

🔗 Additional Context

Original Blog Post: https://trustedsec.com/blog/js-tap-v3-endpoint-post-exploitation-with-javascript-implants

Content Categories: Based on the analysis, this content was categorized under "Pentesting Web > Browser Extension Pentesting Methodology; Network Services Pentesting > 80/443 > Electron Desktop Apps; Generic Hacking / Post-Exploitation; AI > AI Security or Phishing Methodology for Node/Bun preload implants against AI CLI tools".

Repository Maintenance:

• MD Files Formatting: 977 files processed

Review Notes:

• This content was automatically processed and may require human review for accuracy
• Check that the placement within the repository structure is appropriate
• Verify that all technical details are correct and up-to-date
• All .md files have been checked for proper formatting (headers, includes, etc.)

Bot Version: HackTricks News Bot v1.0