Malware, short for “malicious software,” is any software intentionally designed to cause damage, disrupt operations, steal data, gain unauthorised access, or generally harm computer systems, devices, or networks. It encompasses various types of harmful software created by cyber attackers with malicious intent.
There are numerous forms of malware, each with its own specific objectives and methods of operation. Some common types of malware include:
- Viruses: These are programs that replicate themselves by attaching to other programs or files. They can spread throughout a system and potentially damage files or render a system inoperable.
- Worms: Similar to viruses, worms are standalone malware that self-replicates and spreads across networks without needing to attach to other programmes. They exploit vulnerabilities to infect multiple devices quickly.
- Trojans: They disguise themselves as legitimate software to deceive users into downloading and installing them. Once activated, Trojans can perform various malicious activities, such as stealing data, allowing remote access to a system, or creating backdoors for attackers.
- Ransomware: This type of malware encrypts a user’s files or entire system, rendering them inaccessible. Attackers demand a ransom to provide the decryption key, threatening permanent data loss if payment is not made.
- Spyware: It secretly gathers sensitive information, such as passwords, browsing habits, or personal data, and transmits it to third parties without the user’s consent.
- Adware: While not as harmful as other types, adware displays unwanted advertisements or redirects users to malicious websites, impacting the user experience and potentially exposing them to further threats.