Grobios Trojan — How to Remove Active Infections from Your PC

Grobios Trojan — How to Remove Active Infections from Your PC

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This article has been created in order to explain what is the Grobios Trojan and how to remove this malware completely from your computer.

The Grobios Trojan is a dangerous virus threat that has recently been identified in a hacker campaign. It contains advanced code that can cause a lot of damage to the infected hosts, including remote surveillance of the users in real-time. Read more about recovering infected hosts in our complete Grobios Trojan removal guide.

Threat Summary

TypeTrojan Horse Virus
Short DescriptionSilently infects the target machines and modifies key applications and system services.
SymptomsThe user may not experience any signs of infiltration.
Distribution MethodMalicious web links, Malicious Files, Malicious E-Mails
Detection Tool See If Your System Has Been Affected by Grobios


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User ExperienceJoin Our Forum to Discuss Grobios.

Grobios – How Does It Infect

The Grobios Trojan is a potent weapon that can be delivered using various methods. Depending on the target users the operators can choose the most adequate tool. A preferred method may be the use of email SPAM messages that utilize social engineering techniques. Usually they contain hijacked content from legitimate sites and services in the form of text and graphics. Counterfeit notification messages can be crafted that can include the Trojan instances. In addition the emails can also be used to spread infected payload carriers, two popular types are the following:

  • Software Installers — The hackers can embed the Grobios Trojan code in application installers of various types: system utilities, creativity suites, productivity programs and even computer games.
  • Infected Documents — The hackers behind the Grobios Trojan can infect documents using the same mechanism. Targets can be presentations, text documents or spreadsheets. The typical behavior is to integrate dangerous scripts in them, when they are opened a notification message will appear asking the victim users to enable the built-in macros. If this is done the malicious script is activated and the infection follows.

These payloads can be distributed on hacker-controlled sites as well as file sharing networks like BitTorrent. In a manner similar to the emils they can use text and graphics taken from well-known sites and services and customize them with a similar domain name. When malicious scripts are used they can take form of banners, pop-ups, redirects and in-content links. Using advertising and affiliate networks the malicious instance can also take over legitimate sites.

The Grobios Trojan can be deployed to hackers using browser hijackers that represent malicious browser plugins. They are usually uploaded to the relevant plugin repositories with fake developer credentials and user reviews. Detailed descriptions with promises of new features are the main social engineering tactic. Once they are deployed to the systems changes usually follow to the default settings as the criminals redirect the victims to a hacker-controlled page. They also install various tracking cookies to the victim computers. After this is complete the malware infections follows.

At the moment the biggest distribution channel used by the Grobios Trojan remains the use of the RIG Exploit Kit which is used in email campaigns and malvertising sites.

Grobios – More Information and Analysis

The Grobios Trojan is a newly released threat that is being actively pushed to computer victims. The infection starts with an advanced stealth protection module. This module is programmed to protect the virus instance from security software and products that can interfere with its correct execution. This includes anti-virus products, virtual machine hosts and sandbox environments.

When the infected host has been bypassed completely the virus code is multiplied in several locations, including the Program Files (x86) folder. This actions is performed to prevent the users from manually removing the instances by themselves. Furthermore the Trojan is copied to a Google folder with a random name and uses Google Chrome’s icon to hide itself as an asset used by the web browsers.

The security analysis shows that the threat is also set up as a persistent installation. This means that the code is made to execute every time the computer boots. In connection with this Grobios may also delete sensitive user data. This is usually connected with the Shadow Volume Copies which are used for data recovery. When such steps are taken the victims can use our detailed recovery instructions which shows how the data can be recovered.

System changes to the Windows Registry can follow. When the Trojan code acts against user-installed software it can render certain features and services unusable. When this is done against the operating system itself the victims will experience overall performance issues.

The main malicious engine associated with this threat is the actual network connection module. It connects to a hacker-controlled server which is sued to collect the harvested information. Depending on the hacker commands it can be used for different malicious activity such as the following:

  • Sensitive Data Harvest — The Grobios Trojan engine can be programmed into obtaining information that can expose the victim’s identity. Examples include strings like their name, address, interests, location, passwords and account credentials. Part of the information can be used to optimize the attack campaigns.
  • Surveillance — The hackers can spy on the victims in real time, as well as take over their computers. This action is also used for theft of personal files.
  • Malware Deployment — The Grobios Trojan can be used to deliver additional threats to the victim hosts which forms a type of second-stage infection strategy.
  • System Modification — The Trojan code has been found to include functionality that can modify the host systems. This includes the opening of network ports, process manipulation, configuration files modifications and etc.

One of the dangerous aspects when encountering Grobios Trojan strains is the notion that every infection campaign can carry a custom version of the malware. As a result future versions of it can use a completely different behavior pattern. Some of the signatures that anti-virus companies have devised for it include the following identifiers: BKDR_ANDROM.COGAZ, Trojan.Generic.D1CF9DB1, Trojan.Win32.Inject.aivlz, Trojan/Win32.Occamy.C2431572 and others.

Remove Grobios Effectively from Windows

In order to fully get rid of this cryptocurrency miner Trojan, we advise you to follow the removal instructions underneath this article. They are made so that they help you to isolate and then delete the Grobios Trojan either manually or automatically. If manual removal represents difficulty for you, experts always advise to perform the removal automatically by running an anti-malware scan via specific software on your PC. Such anti-malware program aims to make sure that the Grobios is fully gone and your Windows OS stays safe against any future malware infections.


Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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