Remove Lisp Ransomware – Virus Removal

Lisp ransomware is a virus that can encrypt widely held files on a computer. It is a member of STOP/Djvu family of malware, and therefore, it is deemed hazardous and can cause too much trouble for end users. The Lisp virus’s wide-spread campaign targets random users, and its origin is very typical of what computer users are encountering daily. Thus, be careful when visiting websites, downloading files, or opening email attachments. One of these practices may introduce Lisp ransomware to your computer.

How does Lisp infect the computer?

As stated, Lisp is part of the Stop/DJVU ransomware family, and the older editions of this virus include Sglh, Epor, and Vvoa. That being said, we assume that the recent variant is just a remake and that it adopts the same principles as its predecessors. Lisp ransomware spreads via social engineering attacks, fake software updates, infected file installers (freeware or cracked software), bad bots, drive-by-download techniques, Trojan downloaders, and spam email messages.

Among the mentioned approaches, it was through a mass-mailing campaign that the Lisp virus was able to draw quite a number of victims. In this scheme, attackers are going to embed the malware as an attachment to a supposed business email and send it to mass recipients. Due to an attractive subject and messages, many computer users were tricked into opening the file attachment or accessing the included links that kicked off the Lisp ransomware infection.

Lisp File Encryption and Decryption

Once Lisp ransomware is operational on the computer, it sets up a communicate-to-remote command-and-control server. This remote computer is designated by hackers to command the virus from a distance. In addition, the C&C server is responsible for processing the private key and public key for specific victims. It sends the public key to the infected computer, and Lisp will use it while encrypting files on the computer using a complex technique. Along the way, the virus also appends the affected data with the lisp file extension. As a result of this renaming incident, the normal file photo.jpg will become photo.jpg.lisp.

Actors who developed the virus take advantage of the situation to extort money from the victims. It will ask for the ransom demand as payment for the Lisp decryption software. To assure users that this tool is in existence, victims were requested to send a couple of files that attackers would recover using the marketed decryption software.

Screenshot of Lisp encrypted files

Even though only the attackers possess the only working recovery tool, malware researchers and security experts assert that paying the ransom is a bad option because the money collected from these illegal activities may be used to fund future attacks. Thus, these activities carry on and will continue to victimize more computer users.

Technical Details
Threat Name Lisp Ransomware, STOP, DJVU
Threat Type Crypto-virus, File Locker, and Encryption Virus
File Extension .lisp
Ransom Amount $490 – $980
Ransomware Note File _readme.txt
Attacker’s email helpmanager@mail.ch
restoremanager@airmail.cc
Discovered by @demoslay335
Virus Alias Avast : Win32:DropperX-gen
Avira : TR/AD.InstaBot.rrsaw
BitDefender : Trojan.GenericKD.34942563
DrWeb : Trojan.DownLoader35.8326
Emsisoft : Trojan.Crypt (A)
ESET-NOD32 : A Variant Of Win32/Kryptik.HHAE
Kaspersky : HEUR: Trojan-Ransom.Win32.Stop.gen
McAfee: Trojan-FSUC!EC1F882FED68
Microsoft: Trojan:Win32/Glupteba.MS!MTB
Panda : Trj/GdSda.A
Sophos AV : Mal/Generic-S
Symantec : Trojan.Gen.2
TrendMicro : Ransom_Stop.R067C0DJT20

Backup your files

One important step before proceeding with the procedures below is to backup your files. Ransomware attacks are not the same. Each has its own unique set of payloads, aside from encrypting the files with a complex method. Others tend to delete the infected files after a certain period, while others keep them concealed in hidden places. In addition, ransomware decryption tools are not guaranteed to be perfect, and there are instances where files suffer from damages during the decryption process.

So, it is better to create a backup copy of your entire Lisp-encrypted files right now.

Lisp Ransomware Removal Guide

The first thing to do is remove the Lisp virus before attempting the decryption. Remember that as long as the ransomware is active, it will repeatedly encrypt the files on the compromised computer.

Infection with the Lisp ransomware virus is dangerous to the system because it can inject files that run each time Windows starts. To prevent malicious files from loading, the Windows operating system must run with minimal processes, and this can be done through SafeMode With Networking.

Step 1 : Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted computer security and optimization tool equipped with a powerful virus and malware detection engine. This program can get rid of ransomware like Lisp through this procedure.

1. Download the application from the following page:

2. Save the file to your preferred location.

3. Double-click the downloaded file CCSetup.exe and install with the default settings.

4. At the end of the setup process, click Finish to run Combo Cleaner.

5. The tool will update the database file; please wait for this process to complete.

6. To begin checking for threats like Lisp, click on the Start Scan button. Wait for this scan to finish.

Screenshot of Combo Cleaner PC

7. At the end of the scan process, click on Remove all threats to delete Lisp, including all harmful objects from the computer.

To fully optimize the features of antivirus and privacy scanners, users may have to upgrade to the premium version.

Please continue with the succeeding removal procedures if you are comfortable manually getting rid of the ransomware and malicious items linked to it.

Step 2 : Start Windows in Safe Mode With Networking

The method of running Windows in Safe Mode before running a virus scan is effective in getting rid of Lisp. This process can prevent most viruses and malware from loading, making it easier to detect and remove them.

1. On the Windows Search bar, please type msconfig.

Screenshot of Win 11 Search

2. Select and open System Configutation on the list of found results.

3. Once you are in the System Configuration window, go to the Boot tab.

Screenshot of Msconfig Win 11

4. Under the Boot Options area, please check Safe Boot so that it starts in Safe Mode after restarting.

5. Next, select Network. This will allow Windows to boot in Safe Mode with Networking.

6. Lastly, click on Apply and OK to save the changes.

7. Please restart Windows.

Do not forget to restore the normal boot process of Windows after running the virus scan. Simply repeat the method above, and this time, uncheck the Safe Boot option to run Windows normally.

Step 3 : Scan the Computer with Sophos Home Antivirus

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Lisp virus. Aside from our suggested tool, you may also run your own security program.

To remove Lisp ransomware automatically, scanning the computer with this efficient antivirus tool is suggested. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering hazardous ransomware like Lisp.

1. Please click on the link below to download the program.

2. After downloading, locate the file SophosInstall.exe in the Downloads folder.

3. Install by double-clicking on the file.

4. If it prompts "Do you want to allow this app to make changes on your device?" please click Yes.

5. Next, it will display the Terms and Conditions page. Click the Install button to begin.

Screenshot of Terms by Sophos Home

6. Run the installation with the default settings. Please note that an internet connection is required in order to download important updates.

7. After finishing the installation, you must login to the dashboard. If you already have a Sophos account, please login. Otherwise, please enter your details and click on the Create Account button.

8. Once you are in the Sophos Home console, click the Scan button to start checking the computer for Lisp components.

Screenshot of Sophos Home

9. Scanning may take a while; please wait for this process to finish.

10. After scanning the computer, Sophos Home will start cleaning or deleting files infected with Lisp.

11. You may now close Sophos Home. The computer is now free from Lisp, as well as associated malware and viruses.

The above procedures should have totally eliminated Lisp ransomware. However, if you find that there are still remnants of the virus, please proceed to the next steps below.

Step 4 : Double Check with Windows Security Apps

Microsoft Windows has a built-in security application that you can use to double-check if your computer is still infected with Lisp. For Windows 10/11 users, please run Windows Security.

Windows 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove Lisp, viruses, and other malicious items from Windows 10/11 systems. Follow these procedures to scan your computer with the tool:

1. Tap or click the Search charm and search for Windows Security

2. Click Open to run the program.

Screenshot of Win 11 Search

3. On the Dashboard, click Virus and threat protection from the sidebar.

Screenshot of Win 11 Virus Protection

4. On the right panel, click on Scan Options to see different levels of checking the computer.

5. Next, please select Full Scan button.

Screenshot of Full Scan Win 11

6. Lastly, click on the Scan now button to start scanning for the presence of Lisp. The process may take a while to complete.

7. After the scan, Delete/Quarantine identified threats, whether they were relevant to Lisp or not. You may now restart Windows to complete the virus removal process.

For Windows 8.1 and Windows 7, you can scan the computer for free with the Microsoft Malicious Software Removal Tool (MSRT 64-Bit). It is a stand-alone virus scanner tool that targets prevalent malware groups.

Recover Files from Lisp Ransomware Infection

In this section, we will provide ways to decrypt files infected with Lisp ransomware. Aside from dedicated decryption software and common tools, other options for file recovery are provided. As much as we can, we will update this area whenever a new and more suitable decryption tool becomes available.

Find a suitable Lisp decryption tool from Emsisoft

This service from Emsisoft is helpful in unlocking encrypted files without paying a ransom. The page provides a list of ransomware decryption tools. All you have to do is look for the specific tool and start recovering the Lisp-encrypted file.

How to protect the computer from Lisp ransomware?

After the ransomware is removed, it is important to prevent similar incidents from happening again. To effectively protect the computer, the user must know how Lisp ransomware was able to infect it. To minimize the possibility of infection, staying away from the common sources of this virus is crucial.

How does ransomware infect your computer?

The method of infecting the computers was found to be similar to that of other common viruses. Ransomware like Lisp is seen to have efficient deployment via spam email messages, web injectors, malicious software installers, misleading online advertisements, and Trojan Downloaders.

Once the virus is executed, it immediately infects the system. Then, Lisp ransomware communicates with a remote server so that a unique key can be generated for a specific computer. After acquiring the key, it starts to decrypt target files using a complex method that is almost unbreakable. In the final stage of the attack, Lisp ransomware demands ransom money in exchange for the decryption tool. To further understand the attack scheme, we have included an infographic below.

Infographic image of ransomware attack stages
You can print, download, or share the infographic by clicking the image.

What are the essential things to do?

Do a Regular File Back-up - Always backup your data on a separate storage devices such as external hard drives, optical discs, or online backup services.

Keep Your Software Updated - Make sure that you have the latest software updates especially on the operating system. Recent updates often contain vital security patches to help protect the computer against all forms of threats.

Install a Security Program - Protect the computer with effective anti-virus application using efficient real-time scanning. Regularly run a complete scan to check the computer for presence of malware.

Protect your files with Controlled Folder Access (Windows 10/11)

For Windows 10/11 users, aside from protecting the computer using anti-virus or anti-malware programs, one way to protect against ransomware attacks is by using Controlled Folder Access. This feature of Windows Defender Security Center may not prevent the Lisp ransomware infection, but it can protect folders and files in general. Follow the steps to enable Controlled Folder Access in Windows 10/11.

1. Go to Windows Search and type Windows Security.

Screenshot of Win 11 Search

2. Open Windows Security to see all the options.

3. Click Virus and Threat Protection, either on the sidebar or on the main panel.

Screenshot of Ransomware Protection

4. Scroll down to the "Ransomware Protection" area, and click on Manage Ransomware Protection.

5. In the "Controlled Folder Access" section, turn the slider to On. This will enable the feature and protect the folder against Lisp virus or any type of ransomware.

Screenshot of Controlled Folder

6. Click on Protected Folders to see the list of included folders. If Windows displays a message, "Do you want to allow this app to make changes to your device?" please click Yes to proceed.

Screenshot of Protected Folder

7. Click on the Add a Protected Folders button to include additional folders. Make sure that folders with important files are included in the list.

Troubleshooting Guide

Certain programs may be blocked by the Controlled Folder Access feature. To fix the issue, simply have the specific program whitelisted.

1. Under the "Controlled Folder Access" section, click Allow an app through Controlled folder access.

2. If Windows displays the message "Do you want to allow this app to make changes to your device?" click Yes to continue.

3. Next, click the Add an allowed app button.

Screenshot of Allowing App

4. Lastly, click on the Recently blocked app and remove the program from the list of blocked applications.

This Controlled Folder Access feature is one way to protect files against Lisp ransomware. Other important things to do to keep files safe against ransomware are early prevention, like keeping programs updated, installing an efficient security program, and doing regular file backups on a separate media drive.

Tutorial Video to Remove Lisp

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