StopCrypt Ransomware Short Overview
A new version of StopCrypt also known as STOP/DJVU ransomware has emerged in the wild, showcasing new, more advanced capabilities. This latest ransomware conducts its malicious operations through multi-stage shellcodes, culminating in the deployment of a final payload containing the file encryption code. The extension used in these campaigns is .msjd, meaning that all encrypted data will be changed with this extension.
N.B. Keep in mind that StopCrypt demands a ransom payment in exchange for a decryption key, but security experts recommend against paying. First, ransom payments only fuel further malicious operations, and second, there is no guarantee that you would actually get the needed key to restore your data.
StopCrypt Virus Details
| Name | StopCrypt virus, also known as UDS:Trojan.Win32.Chapak.gen, Ransom:Win32/StopCrypt.KM!MTB, Win32:PWSX-gen [Trj], Win32:PWSX-gen [Trj], A Variant Of Win32/GenKryptik.FHJB – more detections of this virus on VirusTotal |
| File Extension | .msjd |
| Type | Ransomware, Cryptovirus |
| Ransom Demanding Note | _readme.txt |
| Removal Time | Approximately 15 minutes for a full-system scan and removal |
| Detection Tool |
Check if your Mac has been affected by StopCrypt
Download
Malware Removal Tool
|
StopCrypt Ransomware – How Did I Get Infected?
The malware infiltrates systems through vulnerabilities in the operating system or installed applications, often relying on the following methods:
- Emails containing malicious attachments or links..
- Downloading files or software from untrustworthy sources.
StopCrypt Ransomware – What Does It Do?
As we already mentioned, this variant employs a sophisticated multi-stage execution mechanism to evade detection and maximize its impact.
Initially, the malware loads an apparently unrelated DLL file (msim32.dll), possibly as a diversion tactic, alongside implementing time-delaying loops to circumvent time-based security measures. It then utilizes dynamically constructed API calls on the stack to allocate memory space for read/write and execution permissions, increasing its stealthiness.
StopCrypt employs API calls for various functions, including capturing snapshots of running processes to analyze its operating environment. Subsequently, it engages in process hollowing, where it takes over legitimate processes and injects its payload for discreet execution in memory. This process involves meticulously orchestrated API calls to manipulate process memory and control flow.
Upon executing the final payload, StopCrypt takes measures to ensure persistence, modifies access control lists (ACLs) to restrict user permissions for crucial malware files and directories, and creates a scheduled task to run the payload at five-minute intervals.
The encrypted files are given a “.msjd” extension, although it’s worth noting that STOP ransomware frequently alters its extensions.
Finally, victims find a ransom note named “_readme.txt” in each affected folder, providing instructions on how to pay the ransom for data recovery:
This evolution of StopCrypt into a more sophisticated and potent threat highlights a concerning trend in cybercrime. While the ransom demands of StopCrypt may not be exorbitant, its potential to cause widespread damage is substantial, despite its operators not engaging in data theft and mainly targeting individual users (rather than organizations).
How to Remove StopCrypt Virus and Decrypt .kool Files?
When faced with such a sophisticated ransomware , act quickly: isolate affected devices, refrain from paying the ransom, identify the threat, back up important data, remove the malware, and make sure your computer is protected in the future. Follow the guide below for detailed steps.
Milena Dimitrova
An inspired writer and content manager who has been with SensorsTechForum since the project started. A professional with 10+ years of experience in creating engaging content. Focused on user privacy and malware development, she strongly believes in a world where cybersecurity plays a central role. If common sense makes no sense, she will be there to take notes. Those notes may later turn into articles! Follow Milena @Milenyim
Follow Me:
- Step 1
- Step 2
- Step 3
- Step 4
- Step 5
Step 1: Scan for StopCrypt with SpyHunter Anti-Malware Tool
Ransomware Automatic Removal - Video Guide
Step 2: Uninstall StopCrypt and related malware 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:
Follow the instructions above and you will successfully delete most unwanted and malicious programs.
Step 3: Clean any registries, created by StopCrypt 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 StopCrypt there. This can happen by following the steps underneath:
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: Boot Your PC In Safe Mode to isolate and remove StopCrypt
Step 5: Try to Restore Files Encrypted by StopCrypt.
Method 1: Use STOP Decrypter by Emsisoft.
Not all variants of this ransomware can be decrypted for free, but we have added the decryptor used by researchers that is often updated with the variants which become eventually decrypted. You can try and decrypt your files using the instructions below, but if they do not work, then unfortunately your variant of the ransomware virus is not decryptable.
Follow the instructions below to use the Emsisoft decrypter and decrypt your files for free. You can download the Emsisoft decryption tool linked here and then follow the steps provided below:
1 Right-click on the decrypter and click on Run as Administrator as shown below:
2. Agree with the license terms:
3. Click on "Add Folder" and then add the folders where you want files decrypted as shown underneath:
4. Click on "Decrypt" and wait for your files to be decoded.
Note: Credit for the decryptor goes to Emsisoft researchers who have made the breakthrough with this virus.
Method 2: Use data recovery software
Ransomware infections and StopCrypt 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.
Simply click on the link and on the website menus on the top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.
StopCrypt-FAQ
What is StopCrypt Ransomware?
StopCrypt 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 algorithms 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.
What Does StopCrypt Ransomware Do?
Ransomware in general is a malicious software that is designed to block access to your computer or files until a ransom is paid.
Ransomware viruses can also damage your system, corrupt data and delete files, resulting in the permanent loss of important files.
How Does StopCrypt Infect?
Via several ways.StopCrypt Ransomware infects computers by being sent via phishing emails, 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.
Another way you may become a victim of StopCrypt 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 .StopCrypt files?
You can't without a decryptor. At this point, the .StopCrypt files are encrypted. You can only open them once they are decrypted using a specific decryption key for the particular algorithm.
What to Do If a Decryptor Does Not Work?
Do not panic, and backup the files. If a decryptor did not decrypt your .StopCrypt files successfully, then do not despair, because this virus is still new.
Can I Restore ".StopCrypt" Files?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .StopCrypt files.
These methods are in no way 100% guaranteed that you will be able to get your files back. But if you have a backup, your chances of success are much greater.
How To Get Rid of StopCrypt Virus?
The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti-malware program.
It will scan for and locate StopCrypt ransomware and then remove it without causing any additional harm to your important .StopCrypt files.
Can I 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:
Germany - Offizielles Portal der deutschen Polizei
United States - IC3 Internet Crime Complaint Centre
United Kingdom - Action Fraud Police
France - Ministère de l'Intérieur
Italy - Polizia Di Stato
Spain - Policía Nacional
Netherlands - Politie
Poland - Policja
Portugal - Polícia Judiciária
Greece - Cyber Crime Unit (Hellenic Police)
India - Mumbai Police - CyberCrime Investigation Cell
Australia - Australian High Tech Crime Center
Reports may be responded to in different timeframes, depending on your local authorities.
Can You Stop Ransomware from Encrypting Your Files?
Yes, you can prevent ransomware. The best way to do this is to ensure your computer system is updated with the latest security patches, use a reputable anti-malware program and firewall, backup your important files frequently, and avoid clicking on malicious links or downloading unknown files.
Can StopCrypt Ransomware Steal Your Data?
Yes, in most cases ransomware will steal your information. It is a form of malware that steals data from a user's computer, encrypts it, and then demands a ransom in order to decrypt it.
In many cases, the malware authors or attackers will threaten to delete the data or publish it online unless the ransom is paid.
Can Ransomware Infect WiFi?
Yes, ransomware can infect WiFi networks, as malicious actors can use it to gain control of the network, steal confidential data, and lock out users. If a ransomware attack is successful, it could lead to a loss of service and/or data, and in some cases, financial losses.
Should I Pay Ransomware?
No, you should not pay ransomware extortionists. Paying them only encourages criminals and does not guarantee that the files or data will be restored. The better approach is to have a secure backup of important data and be vigilant about security in the first place.
What Happens If I Don't Pay Ransom?
If you don't pay the ransom, the hackers may still have access to your computer, data, or files and may continue to threaten to expose or delete them, or even use them to commit cybercrimes. In some cases, they may even continue to demand additional ransom payments.
Can a Ransomware Attack Be Detected?
Yes, ransomware can be detected. Anti-malware software and other advanced security tools can detect ransomware and alert the user when it is present on a machine.
It is important to stay up-to-date on the latest security measures and to keep security software updated to ensure ransomware can be detected and prevented.
Do Ransomware Criminals Get Caught?
Yes, ransomware criminals do get caught. Law enforcement agencies, such as the FBI, Interpol and others have been successful in tracking down and prosecuting ransomware criminals in the US and other countries. As ransomware threats continue to increase, so does the enforcement activity.
About the StopCrypt Research
The content we publish on SensorsTechForum.com, this StopCrypt how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific malware and restore your encrypted files.
How did we conduct the research on this ransomware?
Our research is based on an independent investigation. We are in contact with independent security researchers, and as such, we receive daily updates on the latest malware and ransomware definitions.
Furthermore, the research behind the StopCrypt ransomware threat is backed with VirusTotal and the NoMoreRansom project.
To better understand the ransomware threat, please refer to the following articles which provide knowledgeable details.
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.