How to eliminate Groooboor trojan from the operating system?

Also Known As: Groooboor virus
Type: Trojan
Distribution: Low
Damage level: Severe

Groooboor virus removal guide

What is the Groooboor trojan?

Groooboor is a piece of malicious software, classified as a backdoor trojan. This malware is designed to open a "backdoor" for other malicious programs; i.e. Groooboor can download/install additional malware. This type of malware can infect systems with other types of trojans, ransomware, cryptominers and other malicious software. Groooboor has been observed being proliferates through infectious Microsoft Word documents, likely distributed via dangerous websites and/or spam campaigns.

Groooboor malware detections on VirusTotal

As mentioned in the introduction, Groooboor operates by causing chain infections. What malware backdoor trojans install depend on how they are designed and the modus operandi of the cyber criminals behind them. For example, these trojans can inject systems with malicious programs designed to steal information. Some malware target specific data, like banking information. Data can be stolen using various techniques: downloaded from the infected system, extracted from browsers and other applications (e.g. saved passwords, autofills, etc.), keylogged - record keystrokes (e.g. typed IDs, usernames, passwords, credit card details, etc.), recorded/live-streamed via microphones and cameras, screen-captured, and so on. Remote Access Trojans (RATs) enable remote access and control over the compromised machine. This type of malicious software can have a near user-lever control over the device's hardware, software and stored content. Ransomware can encrypt files and/or lock the screen - in order to demand ransoms for the decryption. Cryptominers mine cryptocurrency by using system resources. Essentially, cryptocurrency is mined by solving mathematical problems by employing computers. When a machine is infected with a cryptominer, this puts a severe strain on system resources and may render the device unresponsive and/or damage it. There is a wide variety of malware out there and malicious programs can have heinous abilities in varied combinations. To summarize, Groooboor infections can result in severe system infections, hardware damage, permanent data loss, financial losses, serious privacy issues and identity theft. If it is suspected and/or known that Groooboor (or other malware) has already infected the system - an anti-virus must be used to eliminate it immediately.

Threat Summary:
Name Groooboor virus
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Detection Names BitDefender (Trojan.Groooboor.Gen.17), Emsisoft (Trojan.Groooboor.Gen.17 (B)), AegisLab (Trojan.MSWord.Groooboor.4!c), NANO-Antivirus (Exploit.Xml.CVE-2017-0199.equmby), Full List (VirusTotal)
Payload Various malicious programs
Symptoms Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
▼ Download Malwarebytes
To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Smoke LoaderBuer Loader, ZLoader - are some examples of other malicious programs, capable of  causing chain infections (i.e. downloading/installing additional malware). They can inject infected systems with RATs (e.g. BitRATDarkCrystal, etc.), information stealers (e.g. AnubisBabax, etc.), banking malware (e.g. Mekotio, Zeus Sphinx, etc.), data-encrypting ransomware (e.g. Suncrypt, Horse, etc.), screenlockers (e.g. SSHBOT, Rubly, etc.), cryptominers (e.g. BitCoinMiner, XMR Miner, etc.), and so forth. Regardless of how malware operates, all system infections pose a threat to device integrity and user safety. Therefore, it is strongly advised to remove malware infections the moment their are detected.

How did Groooboor infiltrate my computer?

At the time of research, Groooboor was spread through virulent Microsoft Word documents. The researched variant was presented as a template for professional/formal letters. Microsoft Office documents infect systems by executing malicious macro commands. In versions released before 2010 - this process is triggered the moment a document is opened. However, Microsoft Office programs released after 2010 - have "Protected View" mode, which prevents automatic execution of macros. When documents are opened in the newer versions, users are asked to enable macro commands (i.e. to enable editing/content); hence, the infection processes can only begin if macros are enabled manually. The Groooboor proliferating documents were possibly distributed through untrustworthy webpages offering such templates and/or spam campaigns. The term "spam campaign" is used to define large-scale operations, during which thousands of deceptive/scam emails are sent. This mail is usually disguised as "official", "important", "priority", "urgent" and similar. The emails contain download links of infectious files and/or the files are simply attached to the letters. The malicious files can be in various formats (e.g. Microsoft Office and PDF documents, archive and executable files, JavaScript, etc.) and when they are executed, run or otherwise opened - the infection chain is initiated. Other malware proliferation methods include untrustworthy download channels, illegal activation tools ("cracks") and fake updates. Dubious download sources, e.g. unofficial and free file-hosting websites, Peer-to-Peer sharing networks and other third party downloaders - can offer malicious programs for downloading, disguised as or packed with ordinary content. "Cracking" tools can download/install malware, instead of activating licensed product. Illegitimate updaters infect systems by exploiting flaws of outdated products and/or by installing malicious software, rather than the promised updates.

How to avoid installation of malware?

Suspicious and/or irrelevant emails must not be opened, especially any attachments or links present in them - as that can lead to a system infection. It is recommended to only use official and trustworthy download channels. Additionally, all products must be activated/updated with tools or functions provided by genuine developers. Illegal activation tools ("cracks") and third party updaters are advised against use, as they commonly distribute malicious programs. To ensure device and user safety, it is paramount to have a dependable anti-virus/anti-spyware suite installed. Furthermore, this software must be kept up-to-date, used to run regular system scans and to remove detected/potential threats. If you believe that your computer is already infected, we recommend running a scan with Malwarebytes for Windows to automatically eliminate infiltrated malware.

Screenshot of the malicious Microsoft Word document distributing Groooboor:

Malicious document distributing Groooboor malware

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Malwarebytes By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Quick menu:

How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Malwarebytes for Windows. If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

 

manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract autoruns.zip and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software.

To be sure your computer is free of malware infections, we recommend scanning it with Malwarebytes for Windows.

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Groooboor virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Groooboor virus on your mobile device.
We Recommend:

Get rid of Windows malware infections today:

▼ REMOVE IT NOW
Download Malwarebytes

Platform: Windows

Editors' Rating for Malwarebytes:
Editors ratingOutstanding!

[Back to Top]

To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.