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Hjem Guloader

Guloader

Also known as: GuLoader, vbdropper, and CloudEyE

Category: Malware

Type: Loader/dropper

Platform: Windows

Variants: Guloader with VBScript and PowerShell script

Damage potential: Spreads malware, deploys ransomware, steals data, compromises systems, infiltrates networks, and causes financial loss

Overview

Guloader is a powerful malware loader that cybercriminals use to deliver secondary malicious payloads, such as ransomware, banking trojans, remote access trojans (RATs), and information stealers. Its distinguishing feature is its ability to store second-stage payloads in trusted cloud storage platforms like Google Drive and Microsoft OneDrive, making it harder for defenses to detect and block.

Cybercriminals use Guloader to install harmful files and execute malicious code on victims’ systems. It is often spread through phishing emails containing malicious attachments or links. In many cases, Guloader connects to command-and-control (C2) servers to receive instructions and download additional malware.

Its modular design allows attackers to quickly modify or replace payloads, making Guloader highly versatile and adaptable. A successful Guloader infection can cause severe damage, including operational disruptions, data breaches, financial harm, and lasting damage to an organization’s reputation.

Possible symptoms

Detecting Guloader is challenging, especially early on. However, you might notice these warning signs:

  • Unexpected file downloads or installations taking place without your consent.
  • Suspicious programs or processes running in the background.
  • Unusual network activity, including frequent or large-scale connections to unknown external servers.
  • System performance issues, such as slow response times, freezing, or crashing.
  • Disabled antivirus or tampered security settings.
  • Unexplained spikes in CPU or disk usage.

Sources of the infection

Guloader takes advantage of several infection methods, including:

  • Phishing emails. Guloader commonly arrives through phishing emails. These messages often contain harmful links or attachments designed to trick users into executing the malware.
  • Malicious documents. The loader is often embedded in macro-enabled Microsoft Office files. Attackers sometimes hide Guloader in compressed files (such as .rar archives) to evade detection.
  • Exploit kits. Guloader may also spread through exploit kits, which leverage vulnerabilities in outdated browsers, plugins, or software.
  • Social engineering. Cybercriminals use deceptive tactics, such as fake software updates, cracked software, or pop-up prompts, to trick users into installing Guloader manually.
  • Compromised websites. Some infected websites host malware that launches drive-by download attacks, infecting your device as soon as you visit the page.

Protection

Follow these steps to reduce your risk of Guloader infection:

  • Always keep your system, software, and antivirus tools up to date.
  • Be cautious with email attachments and links, especially from unknown or suspicious senders.
  • Disable macros in Microsoft Office programs unless you explicitly trust the document's source.
  • Use advanced email filtering and endpoint detection solutions to catch malware early.
  • Employ tools to monitor for unusual or suspicious network traffic. Network segmentation is also effective at containing the spread of malware once it infiltrates your system.
  • Train yourself and your team to recognize phishing emails and practice safe browsing.
  • Secure your systems with strong passwords and enable multi-factor authentication.

Guloader removal

Removing Guloader requires precision to avoid leaving harmful remnants behind. Follow the steps below to remove it.

  1. 1.Disconnect the infected system from your network immediately to stop communication with the attacker’s servers.
  2. 2.Restart the computer in safe mode to limit malware activity.
  3. 3.Run a full antivirus or anti-malware scan using a trusted, updated security tool.
  4. 4.Inspect your system for suspicious startup entries, scheduled tasks, or registry changes. Remove anything associated with Guloader.
  5. 5.Clear temporary files and browser cache to remove any leftover malware traces.
  6. 6.Reset your browsers to their default settings to get rid of Guloader’s malicious adjustments.
  7. 7.If you have a clean backup created before the infection, restore your system to that point.
  8. 8.In cases of severe infection, reinstall your operating system to eliminate the malware fully.

If you're still facing issues, consider seeking professional help to ensure full removal.