The Centre for Cybersecurity Belgium (CCB) is warning about a widespread cyber threat that targets MS Windows users. Malicious software, known as trojans, is being disguised as useful applications, such as PDF editors or internet tools. These programs may look legitimate, but they contain hidden code that can steal your login details and allow criminals to misuse your computer. This cyber threat is active worldwide, including in Belgium, and is considered high risk.
What is a Trojan?
A trojan is a type of malware (computer virus) that hides inside software that appears safe. Once installed, it can secretly perform harmful actions, such as spying on your activity or stealing sensitive information. Because the software often works as expected, users may not realize their device has been compromised.
Who should be careful?
Any Windows user who downloads software from the internet could be affected:
- People searching for free PDF editors, manuals, or everyday tools.
- Employees in organisations where software installation is not strictly controlled.
- Anyone who installs unfamiliar applications without verifying their source.
Some known examples of infected applications include:
- AppSuite PDF Editor
- ManualFinder
- Onestart AI Browser
- BrowserAssistant
- DesktopBar
However, this list is not complete. Any software downloaded from an untrusted source could be dangerous even if it looks professional and functions normally.
- Don’t download programs from websites or ads you don’t trust.
- Be careful with new apps, even if they look safe.
How could you have fallen victim to this Trojan?
The trojans are mainly distributed through:
- Fake websites that mimic real download pages and offer software that appears useful.
- Online advertisements, including Google Ads, that promote tools like PDF editors but secretly install malware.
These methods are designed to trick users into downloading harmful software without realizing it.
What should you do?
If you think you might have installed a trojan, here’s what to do:
- Run a full antivirus scan to find and remove any bad software. Learn how on Safeonweb.
- Check your computer for strange behavior, like things running in the background or your computer acting weird. How can you do that?
- Press Ctrl + Shift + Esc to open Task Manager. Look under the Processes tab for unfamiliar or high-resource usage apps.
- Go to Settings > Privacy > Background apps. Disable apps that don’t need to run in the background.
- Go to Control Panel > Programs > Programs and Features. Look for software you don’t recognize or didn’t install.
- Scan your computer regularly to keep it protected. Learn how on Safeonweb.
More information
For more information and updates, visit the official CCB advisory page.
If you’ve received a letter from the CCB or have questions, you can find answers on the CCB website.
To report an incident, use the official form on the CCB website.
