You did everything right.
Strong passwords. Two-factor switched on. You never reuse a login.
And this time, none of it would have helped.
Because nobody hacked a website. Instead, something quietly slipped onto a device, maybe yours, maybe the shared family laptop, and copied every password saved in the browser. The logged-in sessions. The autofill. All of it. In seconds.
That’s a stealer. And it doesn’t care how careful you’ve been.
Until now, XposedOrNot has told you when a company you trusted got breached. That’s half the story.
The other half is what gets taken straight off a device. And it’s often bigger, fresher, and more dangerous, because a single infection can expose every account at once.
Starting today, we check for that too. Same search, same ten seconds. Now it also tells you if your details have shown up in a stealer log. So you’re not just finding out when they slip up. You’re finding out when something slips past you.
What’s a stealer, and why is it worse
A stealer (short for infostealer) is malware with one job: grab everything useful on a device and send it home.
Saved browser passwords. Session cookies, the little tokens that keep you logged in. Autofill data. Crypto wallets. It scoops all of it, across every site you use, and bundles it into a neat package called a “stealer log.” That log gets sold or traded on the dark web, often within minutes.
Here’s why it stings more than a regular breach. A normal breach leaks one account on one site. A stealer log can expose all of them at once, from a single infection. And those stolen session cookies can let someone walk into your accounts without your password, sometimes even past two-factor.
This isn’t rare or fringe. Infostealers have exploded. In its 2025 X-Force Threat Intelligence Index, IBM reported an 84% jump in emails delivering this malware in 2024 compared with the year before.
A regular data breach | A stealer log |
|---|---|
A company gets hacked | Your device gets infected |
One account, on one site | Every saved account, all at once |
A password reset usually fixes it | Treat the whole device as compromised |
Passwords leak | Passwords, live sessions, and cookies leak |
Introducing stealer coverage, starting with AlienStealer
So we’re expanding what XposedOrNot looks for. Beyond company breaches, we now track stealer logs too.
We’re kicking off with one of the active ones: AlienStealer. It’s the first of several we’ll be adding, and you don’t have to do anything differently to benefit. It’s already part of your search. See everything we track.
What is AlienStealer?
ALIEN TXTBASE is a collection of stealer logs. The data was harvested by infostealers, then bundled and resold through a Telegram channel.
The logs typically contain saved browser passwords, cookies, autofill data, and crypto wallet details, pulled from devices infected through fake software downloads, cracked apps, phishing attachments, and malicious ads.
Once collected, the data did what stealer logs always do: it got packaged up and sold.
The trove held 23 billion rows with more than 490 million unique website-and-email-address pairs, affecting 299 million unique email addresses.
How it shows up on XposedOrNot
Nothing new to learn. You check an email the way you always have.
If your details turn up in a stealer log, it appears right alongside the regular breaches in your results, with one difference: its type is marked Stealer Log, so you can tell at a glance that this came from an infected device, not a hacked company.
Beyond your inbox: for teams and execs
Stealers infect people, not just companies, which means one employee’s infected laptop can quietly expose a business.
If you run security for an organisation, you can scan your whole company at once with our Domain exposure check. And because executives are prime targets, our CXO / VIP dashboard keeps an eye on the people most likely to be hit. More on executive monitoring here.
What to do if you’re exposed
A stealer hit calls for a bit more than a regular breach. If something was taken from a device, treat the whole device as untrusted:
- Change the passwords for the affected accounts, and anywhere you reused them.
- Sign out of all accounts, so stolen cookies stop working.
- Run a full malware(anti-virus) scan on your devices.
- Turn on two-factor or multi-factor authentication everywhere you can.
Is my data safe?
Same promise as always. When you enter an email, we use it for one thing: to check if it’s been exposed. We don’t store it. We don’t track you. We don’t sell anything to anyone.
And we’re fully open source. The code is right there on GitHub for anyone to inspect. Our privacy policy explains the rest in plain language.
This is just the start
AlienStealer is the first stealer we’re adding, not the last. More are on the way.
Want to know the moment your details show up, breach or stealer? Subscribe for free alerts. Or just run a quick check right now. Ten seconds. Worst case, you learn something useful.
(While you’re here: the Executive Exposure write-up explains how we watch over high-risk accounts.)
