What is Fileless Malware, and How to Prevent it?
Tags: filelessmalware, cyberattack, cybersecurity, infosectrain
Published: 2023-08-02 08:38:29



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## **Overview of Fileless Malware**
Fileless malware is also known as a memory-based attack. It is malicious software that infects and operates in computer memory without leaving traces of its presence on the target's storage system. Unlike traditional malware, which depends on files or programs to function, it uses alternative techniques to carry out its malicious activities. It resides in the computer's memory or leverages built-in system tools to execute its actions without concealing itself within files or programs on its hard drive. By exploiting legitimate processes and services already running on the computer, fileless malware becomes more difficult to detect and remove.

## **Fileless Malware Techniques**
Here are some common fileless malware techniques:

●     PowerShell-based attacks

●     WMI (Windows Management Instrumentation)-based attacks

●     Registry-based attacks

●     Fileless malicious documents

●     Memory-based injection

●     Reflective DLL injection

●     Script-based attacks

●     Fileless browser-based attacks

## **How to Prevent Fileless Malware?**
Preventing fileless malware in your organization can be challenging due to its stealthy nature and ability to evade traditional security measures. However, you can take several preventative measures to limit fileless malware risk:

**●  Keep Software Updated:** Frequently update your operating system, applications, and security software to patch any vulnerabilities that could be exploited by fileless malware.
 
**●  Use Robust Security Software:** Invest in reputable antivirus and anti-malware software that includes advanced features such as behavior monitoring, anomaly detection, and memory scanning. 

**●  Limit User Privileges:** Limit user privileges to only what is necessary for their tasks. This reduces the impact of potential malware infections, as attackers will not have access to critical system functions and sensitive data.

**●  Enable Firewall and Network Segmentation:** Ensure firewalls are always enabled on your network and individual systems. Implement network segmentation to reduce the lateral movement of malware within your network.

**● Regularly Back up Data:** Maintain regular backups of your essential files and ensure they are stored securely. 

**● Educate Users:** Train employees or users to be cautious when clicking on unfamiliar links or opening email attachments.

**● Enable Endpoint Protection:** Implement advanced endpoint protection solutions that include features like application whitelisting, script behavior monitoring, and memory protection.

**● Stay Informed and Update Security Practices:** Keep yourself updated on the latest trends and techniques fileless malware uses. Regularly review and enhance your security practices based on emerging threats.

Related articles:

●     [Types of Malware](https://www.infosectrain.com/blog/types-of-malware/)

●     [Types of Viruses](https://www.infosectrain.com/blog/types-of-viruses/)

●     [Common Wireless and Mobile Device Attacks](https://www.infosectrain.com/blog/common-wireless-and-mobile-device-attacks/)

●     [Cyber Attack vs. Data Breach](https://www.infosectrain.com/blog/cyber-attack-vs-data-breach/)

## **How can InfosecTrain help?**
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