25 millions devices infected by the Android malware Agent Smith
An intrusive Adware is an application that displays marketing banners (ads) of all kinds when you are using your computer in a completely normal way, as usual. Advertisements are delivered through pop-up windows or bars that appear on your screen, regardless of the activity you do on your computer. An Adware of this kind is usually created for computers with Windows as their operating system, but it can also be found on mobile devices such as smartphones.
The purpose of an intrusive Adware is that it allows the developer of the Adware to get money when displaying ads on your screen.
This type of malware is usually not intended to damage your data but rather to make money with you, without your knowledge. On a large scale, i.e., if several people are infected, the income can be important for the malicious individual.
In addition to showing invasive pop-ups, an intrusive Adware can greatly affect your computer's performance, including saturating its storage space and sending many web requests.
The word Spyware is composed of the terms "Spy" and "Software". Thus, a Spyware is software whose primary purpose is to steal your personal data in order to either sell it to a third-party buyer or to be able to better target ads based on your stolen personal data, also known as advertising profiling.
The installation of a Spyware is usually done without your knowledge, since most of the time it is hidden in something you want to access (for example some article within a web page, or some program you download from the Internet).
The main symptoms are:
A virus can take many forms, since a virus is fundamentally a malicious program or piece of code that binds to other software, then reproduces until circumstances cause the computer or device to execute the virus (for example, when the software containing the virus is executed).
Viruses can spread in several ways, including through the following:
Due to their flexible nature, computer viruses can produce a multitude of different symptoms. Here are some of them :
The term Ransomware is composed of the words "Ransom" and "Software". A Ransomware has the primary purpose of encrypting your personal data with a special key that only the author of the Ransomware knows, making your files inaccessible. Thus, the malicious person will ask you to pay sometimes excessive fees in order to obtain the key that will allow you to retrieve your personal data.
Unfortunately, just because you pay the ransom does not necessarily mean you will get the key, since he is a malicious individual.
Most of the time, a Ransomware infects your computer through a file you have received or downloaded from the Internet or by email.
You will know that you are infected by Ransomware if your computer is unusable and all you can see is a window asking you to pay a certain amount of money in order to be able to access your files.
The Trojan comes from the history of the Trojan Horse during the Trojan War: At the origin of Ulysses, Greek fighters managed to infiltrate Troy by masking themselves within a huge wooden horse, harnessed with gold, offered to the inhabitants of Troy. Thus, a Trojan in computer science is a program that seems quite harmless that actually contains malicious code capable of infecting or even taking complete control of your computer.
Therefore, if the Trojan gets activated, all data on your computer is potentially at risk of being stolen, deleted or used by the malicious individual, and he may even be able to do everything you can do with your computer.
When a Trojan is perfected, it can be very difficult to detect it: it may be able to take the appearance of software known to you, thus going unnoticed.
The symptoms of Trojan infection of your computer can be very variable, depending on what the malicious individual wants to do to your computer. Overall, any strange behaviour of your computer that you didn't cause should put you on alert.