Fileless Malware

Summary

Fileless malware is a type of malicious software that operates without leaving traditional files on a system, leveraging legitimate system tools and memory to evade detection and persist within a target environment.

Key Characteristics

• Operates primarily in memory, avoiding writing files to disk.
• Utilizes legitimate system processes and scripting languages like PowerShell or WMI.
• Evades traditional signature-based antivirus and endpoint detection systems.
• Often delivered through phishing, malicious macros, or exploit kits.
• Can execute payloads directly in system memory, making it difficult to detect and remove.

Defensive Controls

• Implement behavior-based and heuristic detection tools.
• Use endpoint detection and response (EDR) solutions with memory scanning capabilities.
• Restrict or monitor the use of scripting environments and system tools.
• Apply application whitelisting to prevent unauthorized code execution.
• Maintain up-to-date patches and system hardening to reduce attack surface.

Related Security Solutions

Advanced endpoint protection platforms, EDR tools, behavior analytics systems, application control software, and network monitoring solutions are commonly used to detect and mitigate fileless malware threats.