
Many types of malware exist, including computer viruses, worms, Trojan horses, ransomware, spyware, adware, rogue software, wiper and scareware. According to Symantec’s 2018 Internet Security Threat Report (ISTR), malware variants number has got up to 669,947,865 in 2017, which is twice as many malware variants in 2016. Malware poses serious problems to individuals and businesses. By contrast, software that causes harm due to some deficiency is typically described as a software bug. Malware (a portmanteau for malicious software) is any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, deprive users access to information or which unknowingly interferes with the user's computer security and privacy.

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