CrimsonRAT Malware

Also Known As: Trojan.CrimsonRat
Type: Trojan
Distribution: Low
Damage level: Severe

CrimsonRAT virus removal guide

What is CrimsonRAT?

CrimsonRAT is a remote access tool (RAT) developed in using Java programming language. It is worth noting that CrimsonRAT is categorized as a malware and it is not a legitimate application. Cyber criminals use this to control infiltrated computers and perform various malicious tasks. It is known that crooks spread CrimsonRAT by using various email spam campaigns that contain malicious Microsoft Office documents. You can read more about this distribution method in this article.

CrimsonRAT malware

This tool allows cyber criminals to modify and delete files stored on the hijacked computer. What's more important, however, is that crooks use CrimsonRAT to inject additional malware into the system. In other words, CrimsonRAT is used as a backdoor. In most cases, remote access tools are designed to proliferate various ransomware and data-stealing trojans. Ransomware-type infections are designed to compromise stored data (typically, by encrypting) and demand for ransoms in exchange for the recovery. Data stealers are designed to record various personal information (saved logins/passwords, keystrokes, web browsing activity, etc.) Recorded data is later misused in order to generate. RATs like CrimsonRAT might also be used to distribute adware and browser hijackers. These are applications designed to cause unwanted redirects, gather personal information, and display intrusive advertisements. In summary, presence of a tool like CrimsonRAT might eventually lead to permanent data loss, serious privacy issues (identity theft, financial losses, etc.), decrease in web browsing experience, and and a variety of other problems. We highly recommend to eliminate CrimsonRAT remote access tool as soon as possible.

CrimsonRAT shares similarities with dozens of other malicious remote access tools, such as Brushaloader, ExileRat, and Nymeria. Although the cyber criminals/developers are different, all of these threats have the exact same purpose - to damage the hijacked system and/or steal various data/information. For this reason, elimination of malware like CrimsonRAT is paramount.

How did CrimsonRAT infiltrate my computer?

As mentioned above, CrimsonRAT is often distributed using email spam campaigns. Developers send hundreds of thousands of deceptive emails that contain messages encouraging to open attached MS Office documents. Once opened, these files ask victims to enable macro commands. However, by doing so users grant documents a permission to execute commands that download and run CrimsonRAT. It is worth mentioning that CrimsonRAT's installer is usually named "securetyscan.exe". This is being done to create the impression of legitimacy and trick users into installation (once the installer is executed the User Account Control pop-up appears asking users for a permission to continue). The process (in Windows Task Manager) of CrimsonRAT's sample we analyzed was named "dtiardhues (32 bit)". However, the name of process can be different - cyber criminals typically use strings of random letters or names of legitimate system processes as a disguise. Such remote access tools may also be distributed using other trojans (chain infections), fake software update tools, and software cracks.

How to avoid installation of malware?

In order to prevent such computer infections users must be very cautious when browsing the Internet and downloading/installing/updating software. Always be sure to carefully analyze every single email attachment received. if the received link/file is irrelevant and/or the sender is suspicious/unrecognizable, then certainly do not open anything. Moreover, be sure to download apps only from official sources, using direct download links. Third party downloaders/installers often include rogue apps, which is why such tools should never be used. It is very important to keep installed applications and operating system up-to-date. However, this should be achieved only through implemented functions or tools provided by the official developer. We recommend to never use any software cracking tools because of two reasons: 1) the risk of infections is extremely high, and; 2) software piracy is considered a cyber crime. Lastly, always have a reputable anti-virus/anti-spyware suite installed and running,, because these tools will help you to detect and eliminate malware before the system is harmed. The key to computer safety is caution. If you believe that your computer is already infected, we recommend running a scan with Spyhunter for Windows to automatically eliminate infiltrated malware.

As mentioned above, cyber criminals spread trojans (such as CrimsonRAT) using MS Office documents with macros. Here's an example of such malicious docs:

Malicious attachment distributing CrimsonRAT

Instant automatic removal of Trojan.CrimsonRat: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Trojan.CrimsonRat. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

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How to remove malware manually?

Manual malware removal is a complicated task, usually it's better to let antivirus or anti-malware programs do it automatically. To remove this malware we recommend using  Spyhunter 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's an example of a suspicious program running on 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 1 Download 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 Autoruns.exe file.

extract 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 Autoruns application and locate the malware file that you want to eliminate.

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

locate the malware file you want to remove

After removing the malware through Autoruns application (this ensures that the malware won't 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 file 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 help remove any malware from your computer. Note that manual threat removal requires advanced computer skills, it's recommended to leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections. As always it's better to avoid getting infected that try to remove malware afterwards. To keep your computer safe be sure to install latest operating system updates and use antivirus software.

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