It can happen to anyone. Considering the vast number of viruses and malwares traversing the Internet at any given moment, it’s amazing it doesn’t happen to everyone. A computer virus is a type of malicious software program (“malware”) that, when executed, replicates by reproducing itself (copying its own source code) or infecting other computer programs by modifying them. Infecting computer programs can include as well, data files, or the “boot” sector of the hard drive. Once you know that your machine is infected with a virus (or if your machine is exhibiting unexpected behavior and you suspect that something is wrong), what can you do?
There are several types of computer viruses that can pose a threat to your identity or the data on your computer. It can be categorized according to their origin, spreading capabilities, techniques, operating system, storage location, files they infect and destructive nature. Let’s elaborate these kinds of viruses along with their effects and protection. Some destructive viruses are :
Ransomware is computer malware that installs covertly on a victim’s computer, executes a cryptovirology attack that adversely affects it, and demands a ransom payment to decrypt it or not publish it. Simple ransomware may lock the system in a way which is not difficult for a knowledgeable person to reverse, and display a message requesting payment to unlock it. More advanced malware encrypts the victim’s files, making them inaccessible, and demands a ransom payment to decrypt them.The ransomware may also encrypt the computer’s Master File Table (MFT) or the entire hard drive.Thus, ransomware is a denial-of-access attack that prevents computer users from accessing files since it is intractable to decrypt the files without the decryption key. Ransomware attacks are typically carried out using a Trojan that has a payload disguised as a legitimate file.
In computing, Trojan horse, or Trojan, is any malicious computer program which is used to hack into a computer by misleading users of its true intent. The term is derived from the Ancient Greek story of the wooden horse that was used to help Greek troops invade the city of Troy by stealth.Trojans are generally spread by some form of social engineering, for example where a user is duped into executing an e-mail attachment disguised to be unsuspicious, (e.g., a routine form to be filled in), or by drive-by download. Although their payload can be anything, many modern forms act as a backdoor, contacting a controller which can then have unauthorized access to the affected computer.This infection allows an attacker to access users’ personal information such as banking information, passwords, or personal identity (IP address).
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