Ransomware definition
(or ransomware)

Browse our mini-guide to find out more about this cyber threat

Imagine waking up one day, turning on your computer and discovering that all your files are locked with a message demanding money to unlock them. This is not a scene from a film, but a very real threat called ransomware. Simply put, ransomware is a type of malicious software that prevents you from accessing your files and demands a ‘ransom’ to get them back. This mini-guide aims to explain the ransomware phenomenon in an easy-to-understand way, explaining what it is, how it works, and how you can protect yourself from it.

A digital kidnapper…

Ransomware is like a digital kidnapper. It sneaks onto your computer, locks your files, then demands money to release them. These attacks can be very damaging, resulting in the loss of important files and costing a lot of money. And just like in a real kidnapping, paying the ransom doesn’t always guarantee that you’ll get your files back.

Ransomware attacks can target anyone: from individuals at home, to large businesses, and even state organisations. The rise of digital money, such as Bitcoin, has made these attacks more common, as it allows hackers to pocket a ransom without betraying their identity.

Les 3 principaux profils de ransomware

Le ransomware se présente sous différentes formes, mais les types les plus courants sont le scareware, les verrouilleurs d’écran et le ransomware de chiffrement.

  • Le scareware est comme un escroc numérique. Il vous fait croire que votre ordinateur est infecté par des virus, puis demande de l’argent pour résoudre le problème.

  • Le verrouilleur d’écran agit comme une séquestration numérique. Ils verrouillent votre ordinateur et affichent un message prétendant que vous avez fait quelque chose d’illégal. Pour déverrouiller votre ordinateur, on vous demandera de payer une “amende”.

  • Le ransomware de chiffrement est le type le plus dangereux. C’est comme un perceur de coffre-fort numérique. Il enferme vos fichiers dans un coffre-fort numérique, puis demande de l’argent pour la clé qui sert à déverrouiller le coffre-fort.

How does ransomware lock files?

Ransomware uses a method called encryption to lock your files. It’s like changing the language of your files to a secret code that only the ransomware knows. The most common method is symmetric encryption, where the same secret code is used to lock and unlock files. This secret code is created on your computer when the ransomware sneaks in, and then sent back to the cyber criminals’ computer.

Our mini-guide for everyone

Key points

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guide : définition ransomware
Understanding

Introduction: what is ransomware?

Ransomware is a type of malicious software that prevents users from accessing their system or personal files and demands a ransom to gain access again.
guide : détecter une attaque de ransomware
Assess

Detecting a ransomware attack

There are three main methods for detecting ransomware. Detection by signature, detection by behaviour, and detection by abnormal traffic.
guide: comment réagir à une attaque de ransomware
The right reflexes

How do you respond to a ransomware attack?

As soon as you realise that your organisation has been infected, there's not a second to lose. Isolating affected systems is the first step in preventing a dramatic spread.
guide: exemples d'attaques ransomware
Case studies

Some examples of ransomware attacks

Ransomware attacks have become one of the most worrying cybersecurity threats, particularly in France, ranked 5th among the most targeted countries in 2022.
guide: les menaces ransomware les plus actives
Trends in 2024

What are the most active threats?

Although some major groups such as CONTI and REvil have disappeared, others such as LockBit, BlackCat, Hive and Karakurt have experienced exponential growth in 2023.
guide: se protéger des attaques ransomware
Protection

How can you protect yourself from a ransomware attack?

One of the best preventive measures against ransomware is to keep regular back-ups of all your essential information...

Where to find help

Ransomware is a serious threat in today’s digital world. But understanding what it is and how it works can help you protect yourself. Remember, the best defence is to keep your computer security up to date, and regularly back up your files. That way, even if a ransomware attack occurs, you won’t lose your important files. Stay safe online!
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