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Gootloader

Also known as: -

Category: Malware

Type: Trojan

Platform: Windows

Damage potential: Installing additional malware on the device, data theft, identity theft, file deletion, hardware damage, crypto mining, financial loss.

Overview

GootLoader is a malware loader that belongs to the GootKit trojan family. First discovered in 2020, it primarily targets Windows devices through SEO poisoning or by hiding in compromised websites. It lures users into downloading ZIP files and after infecting a computer, attempts to install additional malware (such as cryptominers, ransomware, or password stealers) on the device. It may also steal sensitive data, damage files, and cause other issues.

Possible symptoms

Detecting GootLoader is difficult because it does its best to stay hidden. The most common symptom of a GootLoader infection is sudden sluggish performance. That’s because GootLoader often injects itself into a legitimate Windows process (like explorer.exe), consuming a lot of memory and CPU and leading to system slowdowns.

Other symptoms of GootLoader include:

  • Unusual network activity (like slower internet).
  • Abnormally high CPU or memory usage.
  • Unauthorized access (like changed settings or files).
  • Unfamiliar software on your system.
  • Unexpected pop-ups, ads, or browser redirects.
  • Frequent error messages or crashes.
  • Changed browser settings (like the homepage).

Sources of infection

GootLoader primarily targets its victims through SEO poisoning and by luring users to download infected files from legitimate, but compromised sites.

Other ways GootLoader may infect your device include:

  • Drive-by downloads. Some compromised or malicious websites may automatically download and install GootLoader when users visit them.
  • File sharing and download sites. Users may download malicious files containing GootLoader from file-sharing or download sites. These files often appear legitimate, but executing them leads to a GootLoader infection.
  • Exploit kits. GootLoader may use exploit kits — toolkits that target known vulnerabilities in software, such as web browsers or plugins. When a user visits a compromised website, the exploit kit exploits these vulnerabilities to install the malware.
  • Infected USB drives. GootLoader may also spread through infected USB devices, such as when transferring files between computers or installing software.

Protection

You can protect yourself from GootLoader and similar infections by becoming more aware of these cyber threats and being cautious online. Here’s how to protect yourself from GootLoader infections:

  • Regularly update software. Keeping your operating system and browsers up to date makes them less vulnerable to malware infections.
  • Only use reputable security software. Choose reliable antivirus and anti-malware software with real-time scanning to detect and prevent GootLoader.
  • Be cautious when opening emails. Don’t click on links or open attachments from unknown sources (particularly Microsoft Office files). If an Excel file asks for permission to activate macroses, double-check the source to ensure it’s trustworthy.
  • Turn off the AutoRun and AutoPlay features. Malware may exploit these features to automatically execute when a USB drive is connected.
  • Use NordVPN’s Threat Protection. This advanced feature blocks malicious sites and may help prevent drive-by downloads. Additionally, it scans your downloads for malware.

Removal

You’ll need specialized anti-malware software to remove GootLoader. Before you proceed, disconnect your device from the internet to prevent further communication with the malware’s command and control servers. Boot your device into safe mode and use your antivirus software to quarantine and remove any detected threats. There might also be cases where GootLoader installs rootkits to hide its presence. Using a tool specifically designed to detect them, can help ensure a thorough removal.