Aviso ransomware / virus (Improved Guide)

Aviso virus Removal Guide

What is Aviso ransomware virus?

What is Aviso ransomware and how does it work?

Aviso virus is a destructive ransomware virus that is written in AutoIt programming language. Some security researchers call it as Brazilian Crypt888 virus (or Mircop virus). It seems that this virus targets Spanish-speaking computer users, because the ransomware is distributed via email and arrives in a form of a .ZIP document that is called ENDESA_FACTURA.ZIP. In other words, this virus arrives in a zipped archive that seems to be sent by Endesa S.A., which is the largest electric utility company in Spain. Once extracted and launched, Aviso malware passes a fake digital certificate issued to Endesa S.A. and this way bypasses Windows protection.

Then the virus starts scanning all computer folders and encrypting victim’s files one after another. After corrupting a file, Aviso ransomware adds Lock. prefix to it. Unlike other ransomware viruses, it does not add any file extension to encrypted files. We assume that it uses a prefix and not an extension so that the user could notice modified files sooner. Then the virus replaces desktop background with this image:

Aviso virus replaces desktop wallpaper with this image
The virus wants the victim to pay a ransom of 2000 Brazillian reais, which is more than 620 US dollars. The ransom note also informs the victim that the hard drive is going to be formatted in case the victim decides not to pay the ransom. Just like typical ransomware parasites, Aviso ransomware asks the victim to buy Bitcoins and pay the ransom with this virtual currency. The victim is asked to write to infomacaoh@gmail.com for decryption details. However, victims should not pay the ransom as authors have hardly improved Crypt888 ransomware in any way. Therefore, Aviso decryption tool is the same as Crypt888’s – you can find its download link below. Before using it, remove Aviso malware with a help of anti-malware software, for instance, FortectIntego.

How to avoid ransomware attacks?

Ransomware viruses are extremely dangerous because they can entirely destroy the computer system. Although Aviso virus is decryptable, others are not, and we believe that it is essential to know how ransomware viruses spread. The majority of them travel via e-mail, just like this Brazilian Crypt888 ransomware. To avoid ransomware attack, you need to take such security measures:

  • Back up your files. Once again, we repeat the boring phrase – back up your files. But do you actually know why we recommend you doing this? It is because files corrupted by ransomware cannot be recovered in most cases, so we always advise our readers to back up essential files by creating their copies and storing them on a removable data storage device. It might sound funny to you, but ransomware can be hidden behind ads of a legitimate and trustworthy website that you often visit. Criminals only need to infect the ad-network that displays ads on that site.
  • Install a trustworthy anti-malware software. Such software can help you to avoid malware attacks by detecting and stopping malicious programs before they enter your computer system.
  • Never open emails sent by suspicious people. Please carefully look at the email address of the sender – if it looks suspicious, distorted, altered to look similar to some company’s official email, do not trust such email letter, and especially be careful not to click on links or files attached to the message. These typically conceal a destructive payload!
  • Before opening a file that you want to see, SAVE it on the system first. Your anti-malware software will check its reliability then, meanwhile by opening it directly you would not give your anti-malware software any time to check it.

How to remove Aviso ransomware virus?

Victims of this virus should not pay the ransom and rush to remove Aviso virus as soon as possible, because there is a free decryption tool that all victims can use. We have explained how to get this tool in data recovery guide, which is provided below. So take care of Aviso removal and start decrypting your files right away!

do it now!
Fortect Happiness
Intego Happiness
Compatible with Microsoft Windows Compatible with macOS
What to do if failed?
If you failed to fix virus damage using Fortect Intego, submit a question to our support team and provide as much details as possible.
Fortect Intego has a free limited scanner. Fortect Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Fortect, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

Getting rid of Aviso virus. Follow these steps

Manual removal using Safe Mode

Important! →
Manual removal guide might be too complicated for regular computer users. It requires advanced IT knowledge to be performed correctly (if vital system files are removed or damaged, it might result in full Windows compromise), and it also might take hours to complete. Therefore, we highly advise using the automatic method provided above instead.

Step 1. Access Safe Mode with Networking

Manual malware removal should be best performed in the Safe Mode environment. 

Windows 7 / Vista / XP
  1. Click Start > Shutdown > Restart > OK.
  2. When your computer becomes active, start pressing F8 button (if that does not work, try F2, F12, Del, etc. – it all depends on your motherboard model) multiple times until you see the Advanced Boot Options window.
  3. Select Safe Mode with Networking from the list. Windows 7/XP
Windows 10 / Windows 8
  1. Right-click on Start button and select Settings.
  2. Scroll down to pick Update & Security.
    Update and security
  3. On the left side of the window, pick Recovery.
  4. Now scroll down to find Advanced Startup section.
  5. Click Restart now.
  6. Select Troubleshoot. Choose an option
  7. Go to Advanced options. Advanced options
  8. Select Startup Settings. Startup settings
  9. Press Restart.
  10. Now press 5 or click 5) Enable Safe Mode with Networking. Enable safe mode

Step 2. Shut down suspicious processes

Windows Task Manager is a useful tool that shows all the processes running in the background. If malware is running a process, you need to shut it down:

  1. Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
  2. Click on More details.
    Open task manager
  3. Scroll down to Background processes section, and look for anything suspicious.
  4. Right-click and select Open file location.
    Open file location
  5. Go back to the process, right-click and pick End Task.
    End task
  6. Delete the contents of the malicious folder.

Step 3. Check program Startup

  1. Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
  2. Go to Startup tab.
  3. Right-click on the suspicious program and pick Disable.

Step 4. Delete virus files

Malware-related files can be found in various places within your computer. Here are instructions that could help you find them:

  1. Type in Disk Cleanup in Windows search and press Enter.
    Disk cleanup
  2. Select the drive you want to clean (C: is your main drive by default and is likely to be the one that has malicious files in).
  3. Scroll through the Files to delete list and select the following:

    Temporary Internet Files
    Recycle Bin
    Temporary files

  4. Pick Clean up system files.
    Delete temp files
  5. You can also look for other malicious files hidden in the following folders (type these entries in Windows Search and press Enter):


After you are finished, reboot the PC in normal mode.

Remove Aviso using System Restore

  • Step 1: Reboot your computer to Safe Mode with Command Prompt
    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Aviso. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with FortectIntego and make sure that Aviso removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Aviso from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

You do not have to pay the ransom since a free Aviso decryption tool is ready to decrypt your files. Use instructions provided below to reverse the encryption process.

If your files are encrypted by Aviso, you can use several methods to restore them:

Decrypt files with Crypt888 decryption tool

Crypt888 decrypter, or Aviso decrypter, is a tool that can be used by Aviso victims to restore encrypted files. You can download Aviso decryption tool from here.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Aviso and other ransomwares, use a reputable anti-spyware, such as FortectIntego, SpyHunter 5Combo Cleaner or Malwarebytes

How to prevent from getting ransomware

Stream videos without limitations, no matter where you are

There are multiple parties that could find out almost anything about you by checking your online activity. While this is highly unlikely, advertisers and tech companies are constantly tracking you online. The first step to privacy should be a secure browser that focuses on tracker reduction to a minimum.

Even if you employ a secure browser, you will not be able to access websites that are restricted due to local government laws or other reasons. In other words, you may not be able to stream Disney+ or US-based Netflix in some countries. To bypass these restrictions, you can employ a powerful Private Internet Access VPN, which provides dedicated servers for torrenting and streaming, not slowing you down in the process.

Data backups are important – recover your lost files

Ransomware is one of the biggest threats to personal data. Once it is executed on a machine, it launches a sophisticated encryption algorithm that locks all your files, although it does not destroy them. The most common misconception is that anti-malware software can return files to their previous states. This is not true, however, and data remains locked after the malicious payload is deleted.

While regular data backups are the only secure method to recover your files after a ransomware attack, tools such as Data Recovery Pro can also be effective and restore at least some of your lost data.

About the author
Olivia Morelli
Olivia Morelli - Ransomware analyst

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