USB Blocker: Antihack Security
Juice-jacking blocker · Hacking-cable detector · USB security
That public charger — or that borrowed cable — might not be a charger at all. Malicious USB cables inject commands and install spyware the moment you plug in. USB Blocker stops the attack instantly.
★ 4.5 rating 544 reviews 10K+ downloads Everyone rated
Free download · Works automatically on plug-in · No data collected
SCREENSHOTS
See it in action
HOW IT WORKS
Protected the moment you plug in
Install & arm it
Download free from Google Play and enable protection once. USB Blocker then guards every USB connection automatically — no manual setup per charge.
Plug in anywhere
Airport, hotel, café, rental car or a borrowed cable: the moment a USB device connects, USB Blocker activates and watches for injected commands.
Attacks get blocked & logged
If a cable or charger tries to act like a hidden keyboard and inject commands, it's stopped instantly — and every attempt is saved so you can review it.
USB locker & blocker
Blocks harmful command injection from malicious USB devices and hacking cables.
Automatic activation
Arms itself the instant a USB device connects — no taps needed.
Real-time alerts
Immediate notification when a malicious cable or device is detected.
Keylogger defense
Stops injected keystrokes from fake-keyboard cables before they execute.
Attack log
Review exactly which commands a malicious cable tried to run.
Spyware installation guard
Prevents remote command injection used to sideload spyware over USB.
FAQ
Frequently asked questions
What is juice jacking?
Juice jacking is an attack where a public charging station or tampered USB cable uses the data pins in the USB connection to steal data or install malware while your phone charges. USB Blocker detects and blocks these attempts automatically. Learn more →
Are public phone chargers actually safe?
Mostly, but security agencies including the FBI have warned against public USB ports because you can't inspect what's behind them. USB Blocker removes the gamble by blocking injected commands the moment they appear. Learn more →
How can a USB cable hack a phone?
Hacking cables (like O.MG cables) hide a chip that registers as a keyboard and types commands into your phone at superhuman speed — installing malware or changing settings. USB Blocker detects the injected keystrokes and stops them. Learn more →
Why does USB Blocker need Accessibility access?
Android only exposes physical-keyboard events (which hacking cables fake) through the Accessibility service. USB Blocker uses it solely to detect and block injected keystrokes — no personal data is collected or shared.
Is USB Blocker free?
Yes — free to download with optional premium features. Core juice-jacking and hacking-cable protection works in the free version.
