Fira App Unwanted Application: Trojan Dropper Virus

I’ve been tracking a particularly nasty threat over the past few days. We’re calling it Fira App, and trust me, it’s not something you want on your system. My team first spotted this sneaky little program spreading through torrent sites and fake movie download pages (the Chernobyl miniseries seems to be a popular lure). What makes this threat especially dangerous isn’t the app itself, but what it brings along – the Legion Loader malware that can absolutely wreck your digital life if left unchecked.

What Is Fira App? The Trojan Horse of 2025

Last day, I spent nearly a 2-hour reverse-engineering this nasty piece of work. On the surface, Fira App looks like just another utility program – nothing special. But dig deeper, and you’ll find it’s essentially a delivery vehicle for some seriously bad stuff.

When I first opened up the installation folder, I was struck by how clever the disguise was. The app creates a well-hidden directory in “%AppData%\Roaming\Hypera Cisla Quero\Fira App” filled with innocuous-looking DLL files. But these aren’t your standard Windows libraries – they’re specifically designed to connect to command servers and quietly download Legion Loader malware while you’re none the wiser.

Think of Fira App as the guy who shows up at your front door claiming to deliver pizza, but actually lets a whole gang of burglars into your house once you’re not looking.

How This Thing Gets Onto Your Computer

In the three weeks we’ve been tracking Fira App, we’ve seen it distributed through four main channels:

1. Torrent sites – You’re trying to download the latest blockbuster, and bam – the download includes a little “extra.” Just last week, I helped a friend who got infected this way while trying to download what he thought was editing software.
2. Fake movie download pages – One case that keeps popping up involves a fake page claiming to offer the Chernobyl 2019 miniseries. Click the download button, and guess what you’re actually getting? Not Chernobyl, that’s for sure.
3. Bundled software – This is particularly sneaky. You download some free software, click “next” a few times without reading (we all do it), and Fira App quietly installs alongside the program you actually wanted.
4. Pop-up ads – Those annoying “Your computer has 13 viruses!” pop-ups? Sometimes clicking anywhere on them – even the X to close – can trigger the Fira App download.

I’ve seen countless infections start with someone saying, “I was just trying to download a movie.” The social engineering is pretty effective – these crooks know exactly how to make you think you’re getting something legitimate when you’re actually inviting disaster into your digital home.

Why Legion Loader Makes This a Five-Alarm Fire

If Fira App was just an annoying piece of adware, I wouldn’t be writing this article. What makes this threat particularly dangerous is its payload: Legion Loader. This is something I’ve been tracking for months, and it’s a beast.

Just last week, I helped a small business recover from a Legion Loader infection that started with Fira App. Their accountant had accidentally installed it, and within 48 hours, the company had ransomware encrypting their files, a cryptominer maxing out their servers, and evidence that their customer database had been exfiltrated. Total damage? Over $40,000 in recovery costs and lost business.

Once Legion Loader gets into your system, it can:

• Steal your cryptocurrency wallets – I’ve seen multiple cases where Bitcoin and Ethereum wallets were completely drained
• Install browser extensions that record everything you do online – including capturing your passwords as you type them
• Drop additional malware – including ransomware that locks up all your files
• Steal emails and credentials – giving attackers access to your accounts
• Create backdoors – allowing hackers to access your computer whenever they want
• Turn your computer into a proxy for other attacks – essentially using your internet connection for other crimes

The Legion Loader malware family is similar to other loaders we’ve seen recently like those dropped by Temeliq Ultra Touch and Tao Raiqsuv Utils. They’re all part of a growing trend of using seemingly innocent applications to deliver devastating malware payloads.

The Digital Fingerprints: How to Spot Fira App

When I’m investigating a potential Fira App infection for a client, here’s what I look for:

• That telltale installation directory: %AppData%\Roaming\Hypera Cisla Quero\Fira App – if you see this, you’ve definitely got the infection
• A collection of DLL files with names like “api-ms-win-core-console-xx-x-x.dll” in strange places – these aren’t the legitimate Microsoft libraries they’re pretending to be
• A process called “Fira App.exe” running in Task Manager – sometimes hiding under “Background processes”
• New entries in your registry’s startup section – specifically in HKCU\Software\Microsoft\Windows\CurrentVersion\Run
• The final smoking gun: a high detection rate on VirusTotal (currently 46 out of 70 security vendors flag it)

The most common symptom that tips people off? Their computer suddenly slowing to a crawl as Legion Loader and its friends start doing their dirty work in the background.

Getting This Junk Off Your Computer

If you’ve realized you have Fira App on your system, don’t panic. I’ve helped dozens of people clean this infection, and while it’s not pleasant, it is definitely fixable. Here’s the step-by-step process I walk my clients through:

Step 1: Kick Fira App to the Curb

1. Hit Windows + R on your keyboard, type control panel and press Enter
2. Navigate to Programs > Programs and Features
3. Look through the list for “Fira App” or anything suspicious you don’t remember installing
4. Right-click and select Uninstall

Pro tip: If you don’t see Fira App listed, don’t worry – that’s actually common. These types of threats often don’t register themselves normally. Move on to Step 2.

Step 2: Hunt Down the Malicious Files

1. Press Windows + R again, type %AppData%\Roaming\ and hit Enter
2. Look for that “Hypera Cisla Quero” folder I mentioned earlier, or anything with “Fira App” in the name
3. Delete these folders completely – don’t worry, they’re not legitimate system files
4. While you’re in this area, scan for any other suspicious folders created around the same time

In one particularly nasty case I worked on, Fira App had created three different folders in the AppData directory, each with different components of the malware. Be thorough!

Step 3: Clean Out Your Browser Extensions

Legion Loader loves to install browser extensions to spy on you. Here’s how to kick them out:

For Chrome:

1. Open Chrome and paste chrome://extensions/ in the address bar
2. Look at each extension carefully – anything you don’t recognize needs to go
3. Click “Remove” on any suspicious extensions
4. After cleaning up, I usually recommend a full browser reset to be safe. Go to Settings > Advanced > Reset and clean up > Restore settings to their original defaults

For Firefox:

1. Click the menu button (three lines in the top-right)
2. Select “Add-ons and Themes”
3. Review all extensions and remove anything suspicious
4. For a clean slate, I recommend resetting Firefox by going to Help > Troubleshooting Information > Refresh Firefox

For Microsoft Edge:

1. Type edge://extensions/ in your address bar
2. Review and remove any extensions you don’t recognize
3. Consider resetting Edge completely via Settings > Reset Settings > Restore settings to their default values

Step 4: Bring in the Big Guns

After manually removing the obvious parts, you’ll want to scan with specialized anti-malware software to catch anything you missed. From my experience with these infections, there are often remnants hiding in places most users wouldn’t think to look.

1. Download Trojan Killer (I’ve had great success with this for Legion Loader infections)
2. Make sure to update its virus definitions before scanning
3. Run a full system scan – yes, it takes time, but it’s worth it
4. Remove everything it flags – at this point, false positives are less dangerous than missed infections
5. Restart your computer to finish the cleanup process

I recently helped a family whose teenage son had accidentally installed Fira App while trying to download a game. Their antivirus missed it completely, but Trojan Killer found not only the Fira App components but also three different pieces of malware that Legion Loader had installed.

An Ounce of Prevention: Staying Safe

After cleaning up dozens of these infections for clients, I can tell you that avoiding Fira App in the first place is much easier than removing it. Here’s what I tell everyone I work with:

1. Be extremely careful where you download stuff – Torrenting sites are especially risky. If you need software, get it from the developer’s official site, not from “free download” portals.
2. Pay attention during installation – Those “Next, Next, Next” clicks can be dangerous. Choose Custom installation and read each screen carefully.
3. Keep Windows updated – I know those update notifications are annoying, but many of these threats exploit known vulnerabilities that updates fix.
4. Use good security software – And keep it updated! An outdated antivirus is almost as bad as no antivirus.
5. Be suspicious of redirects and pop-ups – If you get redirected to an unexpected download page, close it immediately. Don’t click anything, not even the X – use Alt+F4 to close the window.
6. Regularly check your browser extensions – Make it a monthly habit to review what extensions are installed and remove anything you don’t use or recognize.

My client Mark learned this the hard way when he downloaded what he thought was a PDF converter. He ended up with Fira App, which led to Legion Loader, which led to ransomware. Three days of downtime and a $3,000 ransom later, he’s now religious about where he gets his software.

Questions I Get Asked All the Time

The Bottom Line

After spending weeks analyzing Fira App and helping people recover from infections, I can tell you this is one of the more nasty threats I’ve seen recently. Not because it’s particularly sophisticated, but because it’s so effective at what it does: delivering Legion Loader malware that can absolutely devastate your digital life.

The good news? It’s preventable and removable if you know what to look for. Be careful what you download, install good security software, and stay vigilant. And if you think you might be infected, don’t wait – follow the removal steps I’ve outlined above as soon as possible.

If you’re dealing with other malware issues, check out our guides on removing the Wacatac Trojan, dealing with HEUR.Trojan.Script.Generic infections, or our comprehensive article on Legion Loader malware itself. We’ve also seen Fira App distributed alongside other threats like Neptune RAT, so it’s worth checking for multiple infections.

Stay safe out there – the digital world is full of traps like Fira App, but with the right knowledge and tools, you can avoid becoming another victim.