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Lisp Virus [.lisp File]

What Is Lisp Virus Ransomware?

Lisp is the name of a cryptovirus that uses the .lisp suffix which it includes after the files, encoded by it. The infection is a brand-new variation of STOP/DJVU ransomware infections and also has been reported by researchers to still be effective after a years of time since STOP/DJVU ransomware infections initially started getting into computers.

Together with this, the virus drops the _readme.txt ransom note, which has been created with the main purpose to get victims to make ransom payment in the form of BitCoin. This _readme.txt note contains extortion messages that intend to scare victims off by specifying to them that their only shot at obtaining their files back is to pay the ransom money.

Lisp Virus Summary

Name Lisp
File Extension .lisp
Type Ransomware, Cryptovirus
Short Description The ransomware encrypts files on your computer system and demands a ransom to be paid to allegedly recover them.
Symptoms The Lisp ransomware will encrypt your files by appending the .lips extension to them.
Ransom Demanding Note _readme.txt
Distribution Method Spam Emails, Email Attachments
Detection Tool See If Your computer Has Been Affected by malware or other threats.


Malware Removal Tool

User Experience Join Our Forum to Discuss Lisp virus.

Lisp Virus – More Information

There are two primary types of spread means which are used for the infection strategy of the Lisp infection:

  • Harmful files.(. js,. docx,. pdf,. exe,. bat,. cmd).
  • Harmful web links.

In case this virus is executed through harmful files, then the Lisp infection could be distributed either by having its information published on websites where the malware could appear like a legitimate file, software activator, patch, installer, mobile application, or any other type of application that is created to deceive you right into downloading and running the virus.

Yet this is not the only method through which you can become infected with the Lisp ransomware virus. One more method of infection includes e-mail spam messages. These are typically sent out by the criminals and also typically appear to pose as authentic kinds of messages that intend to send you a doc, similar to a receipt, airplane ticket revoked, or others.

In case the infection is done by sending out malicious links, it can occur in different means. It could be because of a suspicious and risky ad triggers you a redirect or it could occur if you have gotten a message from Facebook message, Skype, Viber, etc. As quickly as these web links are opened, an infection script can be activated on your computer system to infect it with Lisp ransomware.

As soon as Lisp virus ransomware finds itself on your computer system, it might start to drop its infection objects.

They may exist in the sticking to Windows directory site websites:

  • %Roaming%
  • %Temp%
  • %Windows%
  • %SystemDrive%
  • %Local%
  • %ProgramData%
  • %system32%
  • %LocalLow%

Lisp infection can carry out various activities once it enters your computer. Such could be:

  • Perform a scan to see if it has been ran on this PC before.
  • Obtain saved login details illegaly.
  • Get admin permissions and tamper with mutexes.
  • Check your IP and region and languange.

Lisp infection belongs to the virus family of STOP Ransomware infections, and is comparable to all the other variants, for example, the one with .promorad extension. After encryption, the virus includes its own suffix to the data, which in this circumstance is .lisp.

After that, the infection might furthermore start to change strings in the following kinds of Windows Reigstry sub-keys on the infected computer system:

→ CurrentVersion\Run
\Control Panel\Desktop

Yet in addition, the Lisp infection might make sure that each one of the file recovery alternatives from the targeted PC are eliminated. For this to occur, it might run these commands as administrator in Windows Command Prompt:

→ cmd.exe /C bcdedit /set {default} recoveryenabled No
sc stop wuauserv
sc stop BITS
sc stop ERSvc
cmd.exe /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
sc stop WerSvc
sc stop VVS
sc stop wscsvc
sc stop WinDefend
C:\Windows\System32\cmd.exe” /C vssadmin.exe Delete Shadows /All /Quiet

In order to make sure the files are encrypted on your computer, the Lisp infection may check for them by their file type. The Lisp virus might scan, detect and then encrypt the following kinds of files:

  • Video formats.
  • Documents.
  • Audio.
  • Image files.
  • Files that are database segments.
  • Archive file types.
  • Virtual drive files.

Paying the ransom to the hackers that have made the Lisp virus is strongly not recommended and researchers highly advise that you focus on deleting the virus plus concentrate on bringing back the files later.

Remove Lisp Virus and Try Restoring Files

Before deleting this ransomware, we suggest that you save the encrypted files somewhere else. This will ensure that your files are risk-free, even if they are currently unopenable.

In case you intend to get rid of the Lisp virus, we advise that you concentrate on the removal instructions underneath. They intend to assist you to remove the malware either by yourself or using an automatic approach. For maximum efficiency, we highly recommend that you focus on removing the risk immediately. This can occur if you download and install a credible anti-malware application that will take care of the removal and additionally make sure that your machine is protected from threats, like Lisp in the future.

To attempt and recover information, we recommend that you have a look at the data restore steps listed below. They are made to guarantee that they assist you to restore as much data as possible, despite the fact that that they are not a 100% guarantee to redeem your data. Yet they are a short-term choice, at the minimum until a free decryptor for this variant of STOP Ransomware is out.

Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy

Windows Mac OS X

How to Remove Lisp virus from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove Lisp virus


Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall Lisp virus and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by Lisp virus on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Lisp virus there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for Lisp virus with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.


If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by Lisp virus.

Ransomware infections and Lisp virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Windows Mac OS X

Get rid of Lisp virus from Mac OS X.

Step 1: Uninstall Lisp virus and remove related files and objects

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to Lisp virus:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to Lisp virus. If you find it, right-click on the app and select “Move to Trash”.

6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to Lisp virus. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove Lisp virus via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as Lisp virus. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Click the button below below to download SpyHunter for Mac and scan for Lisp virus:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by Lisp virus.

Ransomware infections and Lisp virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Lisp virus FAQ

What is Lisp virus ransomware and how does it work?

Lisp virus is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does Lisp virus ransomware infect my computer?

Via several ways.Lisp virus Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of Lisp virus is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .Lisp virus files?

You can't. At this point the .Lisp virus files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .Lisp virus files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by Lisp virus ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".Lisp virus" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Lisp virus files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of Lisp virus ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Lisp virus ransomware and then remove it without causing any additional harm to your important .Lisp virus files.

Also, keep in mind that viruses like Lisp virus ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

How to Report Ransomware to Authorities?

In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer. Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:

Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:

Reports may be responded to in different timeframes, depending on your local authorities.

  1. Vicnent

    I will follow with interest. All my files have the .lisp extension and are encrypted by an online key, no decryption tool works.

    1. Gust

      same here, i hope we get a decryption tool soon bro


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