001
Quiet on real docs
Silent on the pages developers actually copy from — GitHub, Homebrew, package managers. It only speaks up when a page is trying to fool you.
Human execution boundary
The line a website can't make you cross.
A fake CAPTCHA or error page pressures you into copying a "verification command" and running it on your own computer. It's a scam — that command quietly hijacks your machine. ExecFence catches the trap and warns you first.
Add to Chrome — it's freeSee it catch one
Scroll
ordinary traffic passes the linea trap is stopped at the fence
01 — Why it works
Every step of the scam looks ordinary. That is exactly why it works.
02 — The trap, and the fence
A page asks you to prove you're humanIt hands you something to runExecFence steps in — before anything runs
ExecFenceCritical
This website may be trying to trick you into running software on your computer.
Do not paste the copied command into Terminal or PowerShell.
Warning signals 3
- The page presents itself as a human-verification or CAPTCHA check.
- The command downloads something from the internet and runs it immediately.
- The page provides a one-click button that copies text for you.
What that command would do
Reaches the internetYes
Downloads a programYes
Runs what it downloadsYes
Hides an encoded payloadNo
Turns off a security controlNo
Reads saved passwords / keysNo
Installs something that runs at loginNo
- downloads content from verify-human.invalid using curl
- runs the result as code with sh
Contacts:
verify-human.invalidShown by the ExecFence extension you installed — not by this website.
03 — Built to be quiet
Loud only on tricks. Silent everywhere else.
002
Explains itself
Every warning says what the page asked and what the command would actually do — reach the internet, download a program, run it — in plain English.
003
Private by design
Everything is checked on your own computer. It never reads your system clipboard and never uploads what you copy.
004
You stay in control
Clear the tricked clipboard, close the tab, inspect the command, or continue anyway. It warns — it never locks you out.
04 — What leaves your device
0 bytesuploaded, ever
0accounts or sign-ups needed
0checked on your machine