A malware attack is any incident where malicious software is used to steal data, disrupt operations, or give attackers unauthorized access to your systems. Understanding what is a malware attack and how malware works is the first step in building an effective defense.

There are many types of malware attacks, each with a different method of infection and goal, but all are designed to cause harm. Understanding the difference between virus vs malware is also key — a virus is one type of malware, but not all malware is a virus.

1. Viruses

The OG cyber nuisance. A virus latches onto legitimate files and spreads like a digital epidemic. All it takes is one click—maybe in an infected website, or an email attachment—and boom! The virus is unleashed. 

Not all malware is a virus, but all viruses are malware. Malware is an umbrella term for all types of malicious software, and a virus is just one of the many categories. 

2. Ransomware

The cyber equivalent of a hostage situation, this nasty code locks up your data and demands payment (commonly cryptocurrency) for its return. That said, since you’re dealing with literal criminals, there’s no guarantee you’ll get your data back after you pay.

Like viruses, ransomware is another subcategory under the all-encompassing term malware. A good way to remember the difference between the parent term malware and ransomware is this: Malware jacks up your system, and ransomware makes you pay to repair it. 

3. Trojans

Named after the legendary wooden horse that helped sack Troy, trojans infiltrate your systems disguised as something harmless. While you might think you’re downloading a legitimate file, you’re actually letting an attacker into your system. 

As the saying goes for viruses, all trojans are malware, but not all malware are trojans. Trojans create a backdoor for cybercriminals to steal, spy, or spread more malware. 

Not Fun Fact: Across all observed incidents in 2024, the most common threat categories included those related to malware. Infostealers represented the largest single category at 24% of all observed incidents. Malicious Scripts were a close second at 22%, demonstrating their utility for attackers to evade detection and automate exploits. The category labeled simply as "Malware" accounted for 17% of incidents, while Remote Access Trojans (RATs) made up 13%.

Knowing how malware works and how malware spreads is the first step in preventing a malware attack, and human error remains the most exploited entry point.

Some of the most common ways you can get malware through human error include: 

• Phishing emails: Always validate that “urgent” email from your boss. Threat actors will impersonate trusted contacts to trick you into clicking malicious links or downloading malware. 

• Malicious downloads: If something seems too good to be true, it probably has malware attached. Threat actors love to disguise malicious code as legitimate free software and phony apps. 

• Compromised websites: Visiting sketchy websites is an easy way to pick up malware on your device. 

• USBs and external devices: It should be pretty common sense, but don’t plug just any old USB or external device into yours. It’d be like eating gum off the side of the street. Gross. 

With human error being such a huge factor in how successful a malware attack is, it highlights the importance of having a cyber-literate workforce. Cybersecurity awareness training should be a cornerstone of your business’s cybersecurity strategy. The more aware your employees are, the stronger your first line of defense is.

Knowing how to prevent malware attacks requires layered defenses that go beyond antivirus, combining employee awareness, endpoint protection, and real-time monitoring. While there are tried-and-true methods for deploying malware, cybercriminals are wily and dynamic.

Rising to the top as one of the best ways to enhance your security posture is partnering with a managed endpoint detection and response (EDR) provider. Managed EDR diligently monitors endpoints (devices), detects threats in real time, and neutralizes threats before they can do damage. 

Huntress Managed EDR gives you the peace of mind you deserve so you can focus on growing your business. Like a loyal watchdog, our security operations center (SOC) is constantly monitoring your systems for potential threats and responding before things hit the fan. With Huntress, you get a proactive, human-driven approach to cybersecurity that identifies and eliminates malware threats that are often missed by traditional solutions. We don’t just react to attacks—we hunt them down before they can strike.

Malware attacks aren’t going anywhere, but neither is Huntress. 

See how Huntress Managed EDR detects and stops malware attacks before they cause damage.