A computer virus is a type of malicious software that, when executed, replicates itself by modifying other computer programs and inserting its own code. When this replication is successful, it is said that the affected areas are “infected” with a computer virus.
Virus writers use the scams of social engineering and exploit detailed knowledge of security vulnerabilities to initially infect systems and spread the virus.
The vast majority of viruses attack systems running Microsoft Windows, employ a variety of mechanisms to infect new hosts, and often use sophisticated detection / hiding strategies to evade antivirus software. The reasons for creating viruses can include the search for benefits (for example, with ransomware), the desire to send a political message, personal entertainment, to demonstrate that there is a vulnerability in the software, for sabotage and denial of service, or simply because they want to explore issues of cybersecurity, artificial life and evolutionary algorithms.
Currently, computer viruses cause economic damages worth billions of dollars each year, due to system failure, waste of computer resources, data corruption, increased maintenance costs, etc. In response, open source and free antivirus tools have been developed. The antivirus software industry has emerged, selling or distributing free antivirus protection to users of various operating systems. As of 2005, despite the fact that no existing antivirus software was able to discover all computer viruses (especially new ones), computer security researchers are actively looking for new ways to allow antivirus solutions to detect more effectively the emerging viruses, before they have already expanded widely. distributed.