A Malware (a contraction of malicious software) is a blanket term for any software or code intentionally designed to damage, disrupt, or gain unauthorized access to a computer system, network, or data. Cyber criminals use malware to achieve various harmful goals, typically for financial gain, but also for espionage, sabotage, or simple disruption.

Common Types of Malware

Malware is a broad category that includes many different types of threats, each with distinct methods of attack:

• Ransomware: This type of malware encrypts a victim’s files or locks down their entire system, demanding a ransom payment (often in cryptocurrency) in exchange for the decryption key or to restore access.
• Viruses: A virus is malicious code that attaches itself to a legitimate program or file. It requires a user action (like opening the infected file) to execute and then attempts to replicate itself by modifying other programs.
• Worms: Unlike viruses, worms are standalone, self-replicating programs that can spread across networks and systems without any user interaction, often by exploiting vulnerabilities. They typically consume network bandwidth and system resources, slowing down the system.

• Trojan Horse: A Trojan disguises itself as a legitimate or desirable program (like a free game or a useful utility). Once executed, it performs a malicious action in the background, such as creating a backdoor for remote access or stealing data.
• Spyware: This software is designed to secretly monitor a user’s activity and collect sensitive information, such as passwords, banking details, or browsing habits, and transmit it to an attacker.
• Adware: Adware automatically displays, downloads, or plays unwanted advertisements, often in the form of aggressive pop-ups. While often just annoying, more malicious forms can compromise privacy and install other malware.
• Keyloggers: A specific type of spyware that records and logs every keystroke made by a user on an infected device to steal credentials.

Signs of a Malware Infection

While some malware runs silently in the background, you may notice signs that your system is infected:

• Slow performance: Your computer is noticeably slower, freezes, or crashes frequently.
• Unexpected pop-ups: You see a sudden increase in pop-up advertisements.

• Browser changes: Your web browser’s homepage, search engine, or toolbars change without your permission.
• Missing or locked files: Files suddenly become inaccessible or a ransom note appears on your screen (a sign of ransomware).
• Unusual network activity: There’s a high amount of outgoing internet activity that doesn’t correspond to your actions.