Fileless Malware - The Invisible Threat

Detecting malware isn't just about scanning downloaded files; you need to scan them thoroughly. Hackers have developed a new technique for bypassing antivirus and anti-virus programs by using fileless malware, which allows them to avoid detection.

This type of virus is less noticeable than traditional viruses, and it can infect your whole infrastructure without you even realizing it. Let's take a look at how fileless viruses work and what you can do about them.

Malicious software known as fileless malwares don't need to use executables to infect your infrastructures. It doesn't hide in your RAM; rather, it uses trusted, legitimate processes like Microsoft Office macros, PowerShell scripts, and Windows Management Instrumentations (WMIs).

Fileless malware isn’t as noticeable as traditional malware. They use a variety different tactics to keep their persistence going, which may negatively impact the integrity of a company's processes and infrastructure. Fileless malware usually evades security systems by using techniques that prevent them from detecting the malicious code because they don't contain any files to analyze. Most automatic sensors cannot detect illicit scripts, and cybersecurity analysts who are trained to spot them usually have trouble figuring out where to start looking.

Fileless malware was used in an increase of 13 percent in November 2016, according to a report from Trend Micro. Attacks increased by 33 percent from the first three months of 2016 compared to the same period last year. During the first three months of 2017, more than 12,000 unique machines were targeted by PowerShell-based malware.

Kaspersky Labs found over 140 infections in 40 different countries. Most instances of the fileless malware were discovered in financial institutions and worked towards obtaining user logins. In some severe cases, Infections may have stolen enough information to allow hackers to steal undisclosed amounts of money from ATMs.

During 2018, Trend Micro had already seen an increase in fileless malware attacks.

It is unlikely that you've been infected by this strain of malware yet, but it's better not to take any chances. Businesses should implement multiple layers of safeguards, including multi-layered security measures, to protect against cyberattacks. But aside from training employees to be aware of cyberattacks, what actions can companies take to prevent them?

Even if your business isn't in immediate danger, you need to implement solutions that analyze behavioral patterns. You should also consider investing in a managed service provider (MSP) that provides 24/7 network monitoring and patch management. Give us a call to learn more.