How does anti-malware work?

[Olivia]

The original method of signature-based threat detection is effective to a degree, but modern antivirus and anti-malware technology uses additional methods that look for malicious behavior in different ways. This can include analzing a program's structure, behavior, origin, and other characteristics that help determine if it's safe or not. This newer, more effective cybersecurity technology is called heuristic analysis. “Heuristics” is a term researchers coined for a strategy that detects threats by analyzing the program's structure, its behavior, and other attributes.

Each time a heuristic anti-malware program scans an executable file, it scrutinizes the program's overall structure, programming logic, and data. All the while, it looks for things like unusual instructions or junk code. In this way, it assesses the likelihood that the program contains malware. What's more, a big plus for heuristics is its ability to detect malware in files and boot records before the malware has a chance to run and infect your computer. In other words, heuristics-enabled anti-malware is proactive, not reactive.

Some anti-malware products can also run the suspected malware in a sandbox, which is a controlled environment in which the security software can determine whether a program is safe to deploy or not. Running malware in a sandbox lets the anti-malware look at what the software does, the actions it performs, and whether it tries to hide itself or compromise your computer.