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Qu’est-ce qu’un virus informatique ?

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Qu’est ce qu’un virus informatique ? 

C’est un programme (ou autres) malveillant dont l’objectif principal est de perturber le bon fonctionnement d’un appareil ( souvent un ordinateur) . il se transmet et se propage d’appareil en appareil tel une maladie informatique. 

Attention : Dans la mesure où le virus peut accéder à des données personnelles sensible, il peut poser un vrai problème de cybersécurité à prendre au sérieux, dans la sphère privée et professionnelle.  

Comment se transmet un virus informatique ?  

Pour se répandre, le virus informatique (ou malware) s’immisce au sein de programmes et de logiciels légitimes ou apparemment bénins. Cela lui permet de s’installer à l’insu de l’utilisateur. 
Il peut aussi se propager suite à :
• une pièce jointe dans un e-mail
• un téléchargement de logiciels ou de fichiers
• depuis un support physique externe (clé usb, disque dur externe,…)
• via un site web infecté
• grâce à un clique effectué sur un lien malveillant
• et bien plus encore … !

Quels sont les différents types de virus ?

• Virus du secteur d’amorçage

Il s’agit d’un virus qui peut prendre le contrôle de votre ordinateur lors de son démarrage, et endommager le système. Heureusement, c’est un virus relativement simple à éviter, puisqu’il se propage la plupart du temps par une clé USB infectée ou par la pièce jointe d’un e-mail.

Virus de script Web

Ce virus utilise le code de certains navigateurs et pages Web. Il peut infecter votre système si vous vous rendez sur la page d’un site Web malveillant, ou suite à l’ouverture de liens, d’images, de vidéos ou de publicités sur votre navigateur.

Browser hijacker

Pouvant être traduit par “pirate de navigateur”, ce virus détourne votre navigation en vous redirigeant vers des sites Web malveillants.

Virus résident

Ce type de virus s’installe dans votre RAM, la mémoire de votre système informatique, et entre en action à tout moment. Particulièrement sournois, il peut se cacher dans de nombreux endroits, et même dans les fichiers d’un antivirus.

Virus à action directe

Ce virus n’entre en action que lors de l’utilisation d’un fichier infecté. Du fait de sa présence ciblée sur un type de fichier, il est facile à éliminer.

Virus polymorphe

Le virus polymorphe est difficile à intercepter, du fait qu’il change de code à chaque exécution du fichier infecté. Il peut donc facilement passer dans les mailles de l’antivirus utilisé.

Virus infectant les fichiers

Ce type de virus infecte certains fichiers exécutables du système. Ils endommagent les fichiers systèmes et ralentissent les programmes.

Virus multipartite

Ce virus peut infecter votre système en différents points, se propageant dans l’intégralité du système suite à l’exécution d’actions non-autorisées sur le système d’exploitation.

Virus de macro

On retrouve principalement ces virus lors de l’ouverture de documents infectés, s’agissant la plupart du temps de pièces jointes d’e-mails malveillants.

Virus de réseaux

Ces virus se déplacent sur les connexions réseau et peuvent se répliquer grâce à des ressources partagées.

https://nordvpn.com/fr/blog/un-virus-informatique/

Quels sont les signes de présence d’un virus ?

• Votre page d’accueil est différente (sans changements de votre part)
• Il y’a beaucoup de pop-up (fenêtre contextuelle) qui apparaissent et vous dérangent
• Envoie d’e-mail ou de commande non exécutée
• Ralentissement conséquent sur la rapidité ou la performance de votre ordinateur
• Activités inhabituelles
• Présence de programmes inconnus
• Et bien d’autres encore …

Quelles sont les manières de se protéger ? 

Il est le plus souvent possible de supprimer un virus avant qu’il ne fasse des ravages sur un ordinateur, à condition de rester attentif aux symptômes et de choisir la méthode la plus appropriée :  

  • Si possible, restaurer complètement l’ordinateur en le réinitialisant. (Attention à bien sauvegarder vos données avant)
  • Un scan de l’ordinateur, si vous avez le moindre doute, un scan fait par un anti-virus permet d’en avoir le cœur net, à condition que l’antivirus soit à jour. Un fois le scan terminé, l’antivirus envoie un rapport sur les menaces détectées. La plupart des antivirus propose dans la foulée de bloquer les éléments les plus problématique.  Pour certains, il faut avoir souscrit à la version premium. Le processus s’arrête là dans la plupart des cas.  
  • Utiliser une clé USB ou un disque dur de secours en cas d’infection grave, empêchant l’ordinateur de s’allumer, ou au contraire, pour éviter que le virus ne se déploie complètement dans un ordinateur infecté. Dans ce cas, il faut recourir à ce type de support pour scanner le contenu de l’ordinateur via un autre ordinateur sans avoir besoin d’allumer le premier. Le plus souvent, cette méthode permet de supprimer le virus sans avoir besoin d’allumer l’ordinateur. La clé USB ou le disque dur de secours peut généralement être fourni par les éditeurs d’antivirus.  
  • Méthode manuelle : pour certains virus particulièrement sournois, c’est la seule façon de nettoyer l’ordinateur. Elle est réservée aux utilisateurs ayant de l’expérience et de solides connaissances en informatique.   
  • L’utilisation d’un anti-virus et ou d’un VPN peut-être nécessaire.

N’hésitez pas à lire notre article sur les VPN (Cliquez-ici)
ou bien sur l’anti-virus Nod32 dont nous sommes partenaires officiels avec ESET ! (Cliquez-ici)

En cas de virus, n’hésitez pas à nous demander conseils et aides ! Nous pouvons même faire le maximum pour récupérer vos données en cas de perte ! (et non de vol)

Contactez-nous !

N’hésitez pas à partagez et à nous suivre sur nos réseaux sociaux !


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Chinese medicine can t tell you what the disease is by just taking your pulse.It can t be solved. One of us must die today. I ve had enough of this day. Are they really a couple No, if it doesn t work, get a divorce.

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Du Heng said doubtfully, They have children, and they have two sons.In the past, Du Heng himself didn t like doing these frivolous things, but when he really got to this position, he realized that he couldn t do these things.

Because today, Du Xueting s college entrance examination results came out, with a score of 584.Thank you, Doctor Du. Du Heng reached for a pen from Gu Ping s hand and wrote down the diagnosis and prescription on the case.

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After it was promoted, it was recognized by the people and promoted to an alchemist.A few adults from the capital came here just now, they seem to be watchmen, Hongxiu poured wine for Mr.

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ps If you keep the monthly pass and don t vote, it will go bad.The rounded oval face has been reduced a bit, and the chin has become sharper.

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She frowned That s it This house has been unoccupied for many years, not even rented.The reason was that Mr.Tie is not as clean as him.

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These mysteries, like One ring after another, completely unable to stop.The momentum in the room has nothing to do with these sword lights.

When Meng Jingzhe used his spiritual sense to smooth its hair, he had been working hard to deduce this chess game.Meng Jingzhe looked at the altar carefully.When hiding in the sword, it is inevitable that there are places that cannot be Game Last Q5gzw687o Loss Days Weight A Roll Jelly seen clearly.

These souls lost the control of the soul lock lamp and gradually recovered their original consciousness.Looking at the drops of red liquid, Meng Jingzhe felt cold.

Looking at the vast territory of the Western Regions in front of him, Shenshu was silent for a long time, and said slowly I see.Looking at the rune pattern now, he only felt that it was related to sound transmission.

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Of course, I can t find my Tianji Palace.This familiar name, if I guess correctly, is not a spy organization established by the Son of Man.Since Chai Xian invaded the cellar, Chai Mansion has strengthened its defense here.

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Xu Qi an narrowed his eyes, This not only violates the law of Dafeng, but also violates the original agreement between Buddhism and Dafeng.But Miao Youfang is a man with ideals.The young man resolutely rejected the love proposal of the rich family s daughter, and continued to embark on his journey to the river.

Chai Jianyuan asked again Do you know what is so special about Chai Xian, such as six toes Chai Kai was taken aback, shook his head and said, He has six toes Chai Xian is very concerned about the deformity of his toes, and he doesn t even know about his partners when he was a boy Well, there is a reason why the relationship between these two partners is not good.

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The underground of Sitianjian is used to detain prisoners, but there are no prisoners worthy of long term imprisonment throughout the year, so this is usually the guest room of the two disciples of the prison, and they often live there.However, there is no sense of blockage.Take the second step.

The remaining seven magic nails interacted with each other, and the wound burst open again.But only warlocks can refine magic weapons in batches.

Good, that s great Bingyi Yuanjun s cold face became more and more expressionless, and he stood up and said goodbye Poverty Dao still has important things to do.To the east are two futons, on which are two monks sitting cross legged.

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The golden light came from the fragments of the earth book.Xu Qiding considered for a long time I will try to help you, but there is no guarantee of success.

At that time, just ask and you will know.Chai Xian thought for a while, then nodded This method is very good.He said.Tianzong s contact code My Really Lbs So6x7kh6 Loss Burn Flow After Weight And Does It Shed Reviews Before Reddit master This sentence reveals a lot of information.

Using the method of controlling the corpses of the people behind the scenes, I want to solve this group of low level people who are not at the same level people Sir, it s easy.From his dull eyes and blank expression, it can be seen that his mind is chaotic and unable to think.

I want more.Desire personality Xu Qi an s heart moved, and he had a vague guess.Different personalities have different weaknesses.Xu Qi an s muscular waist was squeezed between the two big white pythons, and after a while, ripples appeared on the surface of the hot spring pool.

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