# This Webpage Just Hacked You (FileFix HTA Attack)

**URL:** <https://onehack.st/t/this-webpage-just-hacked-you-filefix-hta-attack/307749>\
**Category:** News & Articles\
**Tags:** hacking, windows\
**Created:** [July 3, 2025, 8:33am UTC](https://onehack.st/t/this-webpage-just-hacked-you-filefix-hta-attack/307749 "2025-07-03T08:33:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SRZ](https://onehack.st/user_avatar/onehack.st/srz/32/146132_2.png) [@SRZ](https://onehack.st/u/SRZ)\
**Post date:** [July 3, 2025, 8:34am UTC](https://onehack.st/t/this-webpage-just-hacked-you-filefix-hta-attack/307749/1 "2025-07-03T08:34:00Z")

</div>

**🧠 One-Line Map:**  
Save a webpage ➜ Rename to `.hta` ➜ Double-click it ➜ You just ran malware (no warning)

* * *

## ⚠ So, What’s the Scam?

Someone sends you a website and says,  
“Hey, save this page and rename it to something nicer… like ‘ImportantFile.hta’ 👀”

You click.  
You smile.  
Your computer starts running secret commands behind your back.  
No warning, no pop-up, no “Are you sure?”

 ![image](https://onehack.st/uploads/default/original/3X/9/b/9b6714dcfcd48e9ba5b3ed0f4e9e8a9a03d5886c.jpeg)

* * *

## 🧙 How It Slips Past Windows Like a Ninja

- You save a webpage like normal (Ctrl + S)
- Browser saves it safely, BUT skips tagging it as “from internet”
- You rename it from `.htm` to `.hta`
- You double-click it
- Windows says: “Sure, come right in!”
- A hidden script runs PowerShell silently in the background
- Congratulations. Your PC is now a stage for someone else’s circus

* * *

## 🧪 What the File Actually Does (No Jargon)

Inside the file, there’s a hidden command saying:

> “Hey Windows, quietly open PowerShell and pull this shady code from the internet.”  
> And Windows, the ever-helpful assistant, says:  
> “You got it, boss.”

* * *

## 🧨 Red Team Side – How Bad Guys Use This

- They tell users to “save the page as a fix” or “MFA backup”
- Or name it “Invoice” or “Refund Details” or some other corporate mumbo jumbo
- File looks innocent… but the moment you rename and run it—BOOM
- PowerShell starts doing yoga in the background, downloading more bad stuff

* * *

## 🧯 Blue Team Side – How to Shut It Down

**Step 1:** Kill `mshta.exe`

- That’s the old-school tool used to run `.hta` files
- Block it with AppLocker or just remove its permissions
- It’s like taking away grandpa’s car keys before he crashes into a firewall

**Step 2:** Make Windows show real file names

- Enable “Show file extensions” in File Explorer
- Now you’ll see if a file ends in `.hta`, not just “Important Document”

**Step 3:** Hunt for weird file activity

- Watch your logs for anyone saving and opening `.hta` files
- If you see it, ask: “Why is Jerry from accounting trying to run legacy web apps?”

**Step 4:** Train your team like you train pets

- Teach them: “Don’t rename file types. Ever.”
- If it walks like HTML, talks like HTML… don’t turn it into a hacker gateway.

* * *

## 🧒 For Regular Folks – 5 Things That Actually Work

1. **Show full file names**  
→ In Windows File Explorer, turn on “File name extensions”

2. **Don’t rename web pages to `.hta`**  
→ If someone tells you to—block them or delete the email

3. **Let Windows update itself**  
→ It patches security holes while you sleep

4. **Block mshta.exe (or ask your IT friend to)**  
→ So `.hta` files don’t even launch

5. **Use common sense**  
→ If the file has an odd name, ends in `.hta`, and looks too helpful—it’s probably evil

* * *

## 🚨 Reality Slap

- Still built-in: `mshta.exe` is on every Windows machine
- Still dumb: Browsers _don’t_ warn you when saving web pages
- Still sneaky: Antivirus might miss the first step entirely
- Still real: This trick is already out there—and getting copied fast

* * *

## 🔗 Helpful Stuff

- [Full Writeup – FileFix HTA Exploit Details](https://www.bleepingcomputer.com/news/security/new-filefix-attack-runs-jscript-while-bypassing-windows-motw-alerts/)
- [Disable mshta.exe (Microsoft Docs)](https://learn.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/applocker/)
- [Original Research and Demo](https://github.com/mrd0x/FileFix)

* * *

## 💀 Final Thought (centered)

**Renaming a file should not be a crime.**  
But Windows treats it like an open bar at a hacker party.

Don’t trust `.hta`.  
Don’t rename files.  
Don’t be the reason IT drinks before noon.