How does fileless malware work and why is it difficult for traditional antivirus software to detect?

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Fileless malware is an advanced type of malicious software that leaves no executable files on the hard drive of an infected computer. Instead, such programs are loaded directly into the device's RAM and use built-in operating system utilities, such as PowerShell or WMI, to operate.

Since traditional antivirus programs conventionally scan the file system for known signatures of malicious code, fileless threats successfully bypass such checks. All malicious activity is masked as legitimate administrative tasks, making anomaly detection an extremely difficult task for standard security tools.

To detect and prevent fileless attacks, the following comprehensive security measures must be implemented:

1. Use specialized EDR-class solutions that analyze process behavior in RAM and record suspicious chains of system utility calls.
2. Limit user privileges and prohibit the execution of PowerShell scripts for accounts that do not need them for daily tasks.
3. Enable security event auditing in the operating system to track anomalous activity in the command line and background processes.
4. Regularly monitor network connections for outgoing traffic to suspicious IP addresses and unknown ports.

Mitigating the risks of fileless malware infection requires shifting from reactive defense methods to proactive infrastructure monitoring. Understanding the logic behind such threats allows system administrators to timely notice suspicious changes in operating system behavior.

How does fileless malware work and why is it difficult for traditional antivirus software to detect?

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