Mamba Ransomware

Also Known As: Mamba virus
Distribution: Low
Damage level: Severe

Mamba ransomware removal instructions

What is Mamba?

Discovered by GrujaRS, Mamba is an updated variant of high-risk ransomware called Phobos. After successful infiltration, Mamba encrypts stored files and appends filenames with the ".mamba" extension plus the victim's unique ID and developer's email address. For instance, "sample.jpg" might be renamed to a filename such as "[1E857D00-1130].[].mamba". Encrypted files instantly become unusable. Mamba also stores the "info.txt" text file on the desktop and displays a pop-up window ("info.hta" HTML application).

The text file and pop-up file deliver a message informing victims of the encryption and encouraging them to contact Mamba's developers if victims want to recover their data. Unlike the text file, however, the pop-up window provides extensive details. The message states that files can only be restored using a unique decryption key. Unfortunately, this is accurate. Mamba encrypts data using a cryptography algorithm that generates a unique decryption key for each victim. All keys are stored on a remote server controlled by cyber criminals (Mamba's developers) and victims cannot access them. To receive a decryption tool (with the key embedded within), each victim must pay a ransom in the Bitcoin cryptocurrency. The cost is not specified - these details are provided via email and the cost supposedly depends on how quickly victims contact the cyber criminals. In most cases, however, size of ransom fluctuates between $500 and $1500. Payments are usually required in a cryptocurrency - this is a common stipulation by cyber criminals. Victims are also permitted to send up to five selected files (less than 10 MB [non-archived] in total). Criminals then decrypt the files and return them as a 'guarantee' that decryption is possible and that these people can be trusted. In fact, cyber criminals often ignore victims, once payments are submitted. Therefore, paying usually gives no positive result and users are scammed. We strongly advise you to ignore all requests to submit payments or even contact these people. Unfortunately, there are no tools capable of cracking Mamba encryption and restoring data free of charge. Therefore, the only solution is to restore everything from a backup, if one has been created.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Mamba decrypt instructions

Mamba shares many similarities with DDOS, PLUT, Wesker Encrypter, SYSTEM FAILURE, and dozens of other ransomware-type viruses. As with Mamba, most of these infections are designed to compromise data so that developers can blackmail the victims. Size of ransom and type of encryption algorithm used are typically the only major differences. Unfortunately, these infections employ cryptographies that generate unique decryption keys. Therefore, unless the malware is not fully developed (has bugs/flaws), restoring data manually without the involvement of developers (contacting these people is not recommended) is impossible. Infections such as Mamba are one of the main reasons why you should maintain regular data backups, however, store them on a remote server or an unplugged storage device, since locally stored backups are encrypted (compromised) with regular files. You are also advised to have multiple backup copies stored in different locations, since there is always the chance that server or storage device will be damaged.

How did ransomware infect my computer?

The way developers proliferate Mamba is currently unknown, however, ransomware infections are often distributed using trojans, fake software cracks/updaters, third party software download sources, and spam email campaigns. Trojans cause so-called "chain infections". They stealthily infiltrate computers and inject them with additional malware. Software cracks activate paid software free of charge, however, most are fake and download/install malware rather than providing access to paid features. Fake updaters are also similar. They usually infect systems by exploiting outdated software bugs/flaws or simply downloading and installing malware rather than the updates. Cyber criminals employ unofficial download sources (freeware download websites, free file hosting sites, peer-to-peer [P2P] networks, etc.) to proliferate malware by presenting it as legitimate software. In doing so, criminals trick users into manual download/installation of malware. Spam email campaigns are also used to in a similar manner. Criminals send hundreds of thousands of deceptive emails that contain malicious attachments (links and/or files) and messages encouraging users to open them. To attempt to give the impression of legitimacy, criminals often present these attachments as important documents (e.g., bills, invoices, receipts or similar). In summary, lack of knowledge of these threats and careless behavior are the main reasons for computer infections.

Threat Summary:
Name Mamba virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .mamba (this malware also appends filenames with the victim's unique ID and developer's email address).
Ransom Demanding Message info.txt text file, info.hta HTML application.
Cyber Criminal Contact,
Detection Names (fd946ba0ca811f8f5cddba5c4634fd64.virus) Avast (Win32:MalwareX-gen [Trj]), BitDefender (Gen:Heur.Titirez.1.F), ESET-NOD32 (a variant of Win32/Kryptik.GSZJ), Kaspersky (Trojan-Banker.Win32.Jimmy.dsw), Full List Of Detections (VirusTotal)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.

To eliminate Mamba virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

To prevent this situation, be very cautious when browsing the internet and downloading/installing/updating software. You should download software from official sources only, using direct download links. Third party downloaders/installers often include rogue apps, and thus these tools should never be used. The same applies to software updates. Keeping installed applications/operating systems up-to-date is essential, however, use only implemented functions or tools provided by the official developer. Be aware that software piracy is considered a cyber crime. Furthermore, using software cracking tools often leads to system infections. For these reasons, you should never attempt to crack installed applications. Handle all email attachments with care. Files/links that are irrelevant should never be opened. Attachments received from suspicious/unrecognizable email addresses should also be ignored. Have a reputable anti-virus/anti-spyware suite installed and running. These tools are capable of detecting and eliminating malware before it harms the system. Caution is the key to computer safety. If your computer is already infected with Mamba, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Mamba ransomware pop-up window ("info.hta"):

All your files have been encrypted!
All your files have been encrypted due to a security problem with your PC. If you want to restore them, write us to the e-mail
Write this ID in the title of your message 1E857D00-1130
In case of no answer in 24 hours write us to this
You have to pay for decryption in Bitcoins. The price depends on how fast you write to us. After payment we will send you the decryption tool that will decrypt all your files.
Free decryption as guarantee
Before paying you can send us up to 5 files for free decryption. The total size of files must be less than 10Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
How to obtain Bitcoins
The easiest way to buy bitcoins is LocalBitcoins site. You have to register, click 'Buy bitcoins', and select the seller by payment method and price.
Also you can find other places to buy Bitcoins and beginners guide here:
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Screenshot of Mamba text file ("info.txt"):

Mamba text file

Text presented within this file:

!!! All of your files are encrypted !!!
To decrypt them send e-mail to this address:
If we don't answer in 48h., send e-mail to this address:

Screenshot of files encrypted by Mamba (".mamba" extension):

Files encrypted by Mamba

Mamba ransomware removal:

Instant automatic removal of Mamba virus: 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 Mamba virus. 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.

Quick menu:

Step 1

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":

Step 2

Log in to the account infected with the Mamba virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Mamba ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Mamba ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Mamba are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Mamba, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Mamba ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Mamba ransomware:

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 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.

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Malware activity

Global virus and spyware activity level today:

Medium threat activity

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

QR Code
Mamba 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 Mamba virus on your mobile device.
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Platform: Windows

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