CCYU ransomware virus & its threat on computers
Contents
CCYU ransomware virus is a piece of destructive computer malware that is known to be released by the infamous STOP/DJVU ransomware gang. The operational method of this virus variant is quite similar to the others in the series before it. After successfully infecting a computer, the ransomware will go after every file contained in it, encrypt its data i.e., make it unreadable for the owner and afterward append .ccyu extension to all the file names, respectively. To explain this more graphically, files that were hitherto saved with names like 1.jpeg, 2.docx, 3.jpg, etc. now transforms to 1.jpeg.ccyu, 2.docx.ccyu and 3.jpg.ccyu respectively following the encryption.
The cybercriminals behind this ransomware typically distribute the virus by disguising the malicious executable as a pirated software setup and uploading it on online torrent platform. Then the criminals patiently wait until unsuspecting users download them and get their computer systems infected.
The ransomware drops a money-demanding note
While still in the process of encrypting the files, the cybercriminals behind the attack will simultaneously send ransom messages called _readme.txt to different folders, notifying their victim about the ransomware attack and why they would have to comply with their demands if they are desirous of restoring their encrypted files.
They would brag that very complex algorithm was used in the encryption, which makes it impossible to be reversed without their help. However, for them to restore the files for the victim, a certain amount of money must be paid as ransom.
In anticipation of the victim’s compliance, they would also drop two email addresses, namely: support@bestyourmail.ch and datarestorehelp@airmail.cc. If the victim decides to write them, they would respond by asking them to pay $980 as a ransom fee in exchange for decryption tools they would provide. However, in order to persuade the victim to pay without delay, they would claim that the ransom fee would be reduced by half, thereby making it $490 if only the victim would be able to pay within three days maximum of being notified to make payment.
They would also warn that failure to meet the deadline nullifies the ransom price reduction and only the full payment would be acceptable. It is also important to note that payment can only be made via cryptocurrency by paying into a wallet address owned by the cybercriminals. They encourage this payment method because it protects their real identities.
Nevertheless, it is in the best interest of the victim never to respond to cybercriminals and neither should payment be made to them. This advice was given by the FBI, and other top cybersecurity organizations also support it. Here are some of the reasons why it is not recommended to comply with criminals’ orders:
- Ransom payment does not guarantee you will recover your encrypted files.
- Victims that pay ransom make themselves vulnerable to future attacks by greedy cybercriminals that usually ask for more.
- Paying ransom helps cybercriminals to expand their illegal operations, which eventually grows the number of victims.
Take action to protect your computer ASAP
Although much attention is being directed to CCYU ransomware virus, there are yet other dangerous malware infections known as RATs that are often attached alongside the primary ransomware virus. RATs literally means Remote Access Trojans and are mainly used in covert stealing of important personal information like banking details, passwords, browsing history, software login credentials, and cryptocurrency wallets among others. These are the basic considerations why it is very important to remove any STOP/DJVU ransomware virus once it is detected in any computer.
The curtail possible damages on the side of the victim, the ransomware should be removed ASAP by first login into the compromised computer through Safe Mode with Networking option before applying strong antivirus software. Emphasis is on getting ONLY genuine antivirus. You may also decide whether to download RESTORO to help repair some of the damaged Windows OS files. Some of the operating system files are often affected during a ransomware attack and should be fixed in order to ensure the system functions optimally again.
Ransomware Summary
| Name | CCYU Ransomware Virus |
| Type | Ransomware; Crypto-malware; Virtual Extortion Virus |
| Family | STOP/DJVU |
| Encryption type | RSA 2048 + Salsa20 |
| Previous versions | JYPO, KIFR, KIOP, KITZ, BOZA, BOTY, COZA (find full list here) |
| Version | 536th |
| Extension | .ccyu |
| Cybercriminal emails | support@bestyourmail.ch, datarestorehelp@airmail.cc |
| Additional malware dropped | Azorult or Vidar Trojan |
| Damage | The ransomware uses encryption to maliciously modify all files on the PC and marks their original names with .ccyu extension. Ransom notes called as _readme.txt will be dropped in every computer folder. This piece of malware usually drags VIDAR Stealer alongside it and also eliminates VSS from the system. On top of that, it tends to modify Windows HOSTS file to restrict computer user’s access to cybersecurity-related websites online. |
| Ransom note | _readme.txt |
| Ransom demand | $490-$980 in Bitcoin |
| Distribution | Victims often download this ransomware along illegal torrent downloads, cracked software, activators, key generators or tools like KMSPico. |
| Known software cracks to contain this malware | Corel Draw, Tenorshare 4ukey, Adobe Photoshop, Cubase, Adobe Illustrator, Internet Download Manager, Tally, League of Legends. |
| Detection names | Ransom:Win32/StopCrypt.PAL!MTB (Microsoft), Trojan.Crypt (A) (Emsisoft), HEUR:Trojan-Ransom.Win32.Stop.gen (Kaspersky), Trojan.GenericKD.47850419 (BitDefender), Trojan.MalPack.GS (Malwarebytes), ML.Attribute.HighConfidence (Symantec) see all detection name variations on VirusTotal |
| Removal | Remove ransomware and related malware from your PC using trustworthy software. To repair virus damage on Windows OS files, consider scanning with RESTORO (secure download link). |
REPAIR VIRUS DAMAGE
Scan your system for FREE to detect security, hardware and stability issues. You can use the scan results and try to remove threats manually, or you can choose to get the full version of software to fix detected issues and repair virus damage to Windows OS system files automatically. Includes Avira spyware/malware detection & removal engine.
Below we have attached a screenshot which shows how files affected by this ransomware look like.
Methods used by cybercriminals in spreading malware & how to protect your computer
Cybercriminals always seek new methods by which they can take their victims unawares. Therefore, computer users shouldn’t lose guard or get involved in online activities that could put their computer at significant risks of cyber-attack. Activities such as going to online torrent platforms to seek for cheaper or free alternatives to original software versions should be totally avoided. In addition to that, emails from unknown or spoofed address sources shouldn’t be opened.
These are some of the most prolific methods used by cybercriminals in distributing malware including CCYU ransomware virus. Also, you should be wary of enticing titles like Invoice, Order Summary or Tracking Details that may be placed on the accompanying attachments. Such emails and attachments, especially when they’re out of the blues, should never be opened to avoid triggering a ransomware virus.
Based on our studies on past victims, we discovered that cybercriminals usually clone software contents that are in high demand to increase their chances of getting as many victims as possible. They would illegally pirate such software contents, embed malware on them and upload on online torrents while hoping that unsuspecting users will take the bait. Please check the list below for some of the popular software contents they often pirate:
- VMware Workstation;
- Fifa 22;
- Adobe Illustrator;
- Adobe Photoshop;
- Adobe Premiere Pro;
- Virtual DJ Pro;
- Corel Draw;
- Cubase;
- Tenorshare 4ukey;
- League of Legends;
- AutoCad;
- Internet Download Manager.
It is important to note that the original versions of these software contents can easily be downloaded from the official pages of the copyright owners. Unfortunately, some users don’t like paying the requisite fees demanded by them but would rather want to cut corners by getting them illegally. However, in their efforts not to spend money, they put their computer at significant risks of ransomware attack and may end up wasting a lot of money, time, and vital documents. It should also be noted that such unwholesome activities hurt the IT industry while rewarding online rogues.
Files such as PDF, DOCX or XLS among similar ones where created for altruistic reasons, but cybercriminals now take advantage of their respective macro function enablement to attach ransomware virus on them.
For those that have already fallen victim to STOP/DJVU ransomware virus, please avoid websites that make dubious claims of having decryption solutions because such claims are usually false. Based on our studies, only the pair of DiskTuna and Emsisoft have decryption/data repair tools that have been proven to be effective.
Remove CCYU ransomware virus and also recover encrypted files
In conclusion, the recommended way to remove CCYU ransomware virus is to login into the infected computer through Safe Mode with Networking option before activating an antivirus software. It is important to always go for antivirus software with good track record.
Additionally, we recommend to download RESTORO to try and repair virus-damaged Windows operating system files. After taking the above step, there are other steps you will need to take as listed below:
- Report to relevant local authorities charged to oversee such issues.
- Use a backup to replace lost files.
- Look for possible ways you can restore damaged files if the option above is not available.
- Change all passwords with immediate effect.
OUR GEEKS RECOMMEND
Our team recommends a two-step rescue plan to remove ransomware and other remaining malware from your computer, plus repair caused virus damage to the system:
STEP 1. REMOVE AUTOMATICALLY WITH ROBUST ANTIVIRUS
STEP 2. REPAIR VIRUS DAMAGE TO YOUR COMPUTER
GeeksAdvice.com editors select recommended products based on their effectiveness. We may earn a commission from affiliate links, at no additional cost to you. Learn more.
CCYU Ransomware Virus Removal Guidelines
Method 1. Enter Safe Mode with Networking
Step 1. Start Windows in Safe Mode with Networking
Before you try to remove CCYU Ransomware Virus virus, you must start your computer in Safe Mode with Networking. Below, we provide the easiest ways to boot PC in the said mode, but you can find additional ones in this in-depth tutorial on our website – How to Start Windows in Safe Mode. Also, if you prefer a video version of the tutorial, check our guide How to Start Windows in Safe Mode on Youtube.
Instructions for Windows XP/Vista/7 users
- First of all, turn off your PC. Then press the Power button to start it again and instantly start pressing F8 button on your keyboard repeatedly in 1-second intervals. This launches the Advanced Boot Options menu.
- Use arrow keys on the keyboard to navigate down to Safe Mode with Networking option and press Enter.
Instructions for Windows 8/8.1/10/11 users
- Open Windows Start menu, then press down the Power button. On your keyboard, press down and hold the Shift key, and then select Restart option.
- This will take you to Windows Troubleshoot screen. Choose Troubleshoot > Advanced Options > Startup Settings > Restart. Tip: If you can't find Startup Settings, click See more recovery options.
- In Startup Settings, press the right key between F1-F9 to enter Safe Mode with Networking. In this case, it is the F5 key.
Step 2. Remove files associated with the virus
Now, you can search for and remove CCYU Ransomware Virus files. It is very hard to identify files and registry keys that belong to the ransomware virus, Besides, malware creators tend to rename and change them repeatedly. Therefore, the easiest way to uninstall such type of a computer virus is to use a reliable security program such as INTEGO Antivirus. For virus damage repair, consider using RESTORO.
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RESTORO is a unique PC Repair Tool which comes with an in-built Avira scan engine to detect and remove spyware/malware threats and uses a patented technology to repair virus damage. The software can repair damaged, missing or malfunctioning Windows OS files, corrupted DLLs, and more. The free version offers a scan that detects issues. To fix them, license key for the full software version must be purchased.
Method 2. Use System Restore
In order to use System Restore, you must have a system restore point, created either manually or automatically.
Step 1. Boot Windows in Safe Mode with Command Prompt
Instructions for Windows XP/Vista/7 users
- Shut down your PC. Start it again by pressing the Power button and instantly start pressing F8 button on your keyboard repeatedly in 1-second intervals. You will see Advanced Boot Options menu.
- Using arrow keys on the keyboard, navigate down to Safe Mode with Command Prompt option and press Enter.
Instructions for Windows 8/8.1/10/11 users
- Launch Windows Start menu, then click the Power button. On your keyboard, press down and hold the Shift key, and then choose Restart option with the mouse cursor.
- This will take you to Windows Troubleshoot screen. Choose Troubleshoot > Advanced Options > Startup Settings > Restart. Tip: If you can't find Startup Settings, click See more recovery options.
- In Startup Settings, press the right key between F1-F9 to enter Safe Mode with Command Prompt. In this case, press F6 key.
Step 2. Start System Restore process
- Wait until system loads and command prompt shows up.
- Type cd restore and press Enter, then type rstrui.exe and press Enter. Or you can just type %systemroot%system32restorerstrui.exe in command prompt and hit Enter.
- This launches System Restore window. Click Next and then choose a System Restore point created in the past. Choose one that was created before ransomware infection.
- Click Yes to begin the system restoration process.
After restoring the system, we recommend scanning the system with antivirus or anti-malware software. In most cases, there won't be any malware remains, but it never hurts to double-check. In addition, we highly recommend checking ransomware prevention guidelines provided by our experts in order to protect your PC against similar viruses in the future.
Alternative software recommendations
Malwarebytes Anti-Malware
Removing spyware and malware is one step towards cybersecurity. To protect yourself against ever-evolving threats, we strongly recommend purchasing a Premium version of Malwarebytes Anti-Malware, which provides security based on artificial intelligence and machine learning. Includes ransomware protection. See pricing options and protect yourself now.
System Mechanic Ultimate Defense
If you're looking for an all-in-one system maintenance suite that has 7 core components providing powerful real-time protection, on-demand malware removal, system optimization, data recovery, password manager, online privacy protection and secure driver wiping technology. Therefore, due to its wide-range of capabilities, System Mechanic Ultimate Defense deserves Geek's Advice approval. Get it now for 50% off. You may also be interested in its full review.
Disclaimer. This site includes affiliate links. We may earn a small commission by recommending certain products, at no additional cost for you. We only choose quality software and services to recommend.
Decrypt CCYU files
Fix and open large CCYU files easily:
It is reported that STOP/DJVU ransomware versions encrypt only the beginning 150 KB of each file to ensure that the virus manages to affect all files on the system. In some cases, the malicious program might skip some files at all. That said, we recommend testing this method on several big (>1GB) files first.
- Create a copy of encrypted file to a separate folder using Copy > Paste commands.
- Now, right-click the created copy and choose Rename. Select the CCYU extension and delete it. Press Enter to save changes.
- In the prompt asking whether you want to make the changes as file might become unusable, click OK.
- Try opening the file.
STOP/DJVU decryption tool usage guide
STOP/DJVU ransomware versions are grouped into old and new variants. CCYU Ransomware Virus is considered the new STOP/DJVU variant, just like JYPO, KIFR, KIOP, KITZ, BOZA, BOTY, COZA (find full list here). This means full data decryption is now possible only if you have been affected by offline encryption key. To decrypt your files, you will have to download Emsisoft Decryptor for STOP DJVU, a tool created and maintained by a genius security researcher Michael Gillespie.
Note! Please do not spam the security researcher with questions whether he can recover your files encrypted with online key - it is not possible.
In order to test the tool and see if it can decrypt CCYU files, follow the given tutorial.
- Download the decryption tool from Emsisoft.
- Click the little arrow next to your download and choose Show in Folder.
- Now, right-click the file and choose Run as Administrator. If asked, enter administrator's password.
- In UAC window, click Yes.
- Click Yes to agree to software terms in both windows.
- The tool will automatically include C:// disk as a location to decrypt. The file recovery tool will prepopulate the locations to scan, including connected data storage drives or network drives. Click Add folder if you wish to add additional locations.
In Options tab, you can choose to keep encrypted file copies. We recommend leaving this option selected, especially if you do not know if the decryption tool will work. - Click Decrypt to start restoring CCYU files. You will see the progress in the Results tab. Here, you can see messages from the tool, such as whether the decryption procedure is successful, or you need to wait for an update.
You might also be informed that online key was used to encrypt your files. In such case, the decryption tool won't work for you, and the only way to recover your files is to use a data backup.
Meanings of decryptor's messages
The CCYU decryption tool might display several different messages after failed attempt to restore your files. You might receive one of the following messages:
Error: Unable to decrypt file with ID: [example ID]
This message typically means that there is no corresponding decryption key in the decryptor's database.
No key for New Variant online ID: [example ID]
Notice: this ID appears to be an online ID, decryption is impossible
This message informs that your files were encrypted with online key, meaning no one else has the same encryption/decryption key pair, therefore data recovery without paying the criminals is impossible.
Result: No key for new variant offline ID: [example ID]
This ID appears to be an offline ID. Decryption may be possible in the future.
If you were informed that an offline key was used, but files could not be restored, it means that the offline decryption key isn't available yet. However, receiving this message is extremely good news, meaning that it might be possible to restore your CCYU extension files in the future. It can take a few months until the decryption key gets found and uploaded to the decryptor. We recommend you to follow updates regarding the decryptable DJVU versions here. We strongly recommend backing up your encrypted data and waiting.
Report Internet crime to legal departments
Victims of CCYU Ransomware Virus should report the Internet crime incident to the official government fraud and scam website according to their country:
- In the United States, go to the On Guard Online website.
- In Australia, go to the SCAMwatch website.
- In Germany, go to the Bundesamt für Sicherheit in der Informationstechnik website.
- In Ireland, go to the An Garda Síochána website.
- In New Zealand, go to the Consumer Affairs Scams website.
- In the United Kingdom, go to the Action Fraud website.
- In Canada, go to the Canadian Anti-Fraud Centre.
- In India, go to Indian National Cybercrime Reporting Portal.
- In France, go to the Agence nationale de la sécurité des systèmes d’information.
If you can't find an authority corresponding to your location on this list, we recommend using any search engine to look up "[your country name] report cyber crime". This should lead you to the right authority website. We also recommend staying away from third-party crime report services that are often paid. It costs nothing to report Internet crime to official authorities.
Another recommendation is to contact your country's or region’s federal police or communications authority.
Frequently Asked Questions
You can only open CCYU files if you have the decryption key, or if you were affected by offline encryption type.
To figure out whether you were affected by offline encryption, please go to C:/SystemID/PersonalID.txt and see if the string inside of it ends in t1. You can also try using Emsisoft Decryptor for STOP/DJVU.
Please follow the guidances provided by the official CCYU decryption tools and believe what they say. If they say it is impossible to decrypt, it really is so. There is no magic tool or human capable of decrypting your files hiding somewhere. Encryption is a technique created to be nearly impossible to decrypt without a special private key (held by the criminals).
We advise scanning with anti-virus, anti-malware, malware removal tools or software like RESTORO to eliminate virus damage on the system. If you do not trust using a single tool, try running one after another. However, we do not recommend keeping several security programs on a computer at once as they can interfere with each other's work.
Beware of fake CCYU decryption tools circulating around the web. Cyber criminals are uploading them to various shady websites, also might be promoting them via suspicious Youtube videos. These programs can infect your computer even more heavily (Trojans, miners, etc.). We suggest being extremely cautious around the web. If there will be an official STOP/DJVU decryption tool available, it will be widely discussed in public media.
Norbert Webb is the head of Geek’s Advice team. He is the chief editor of the website who controls the quality of content published. The man also loves reading cybersecurity news, testing new software and sharing his insights on them. Norbert says that following his passion for information technology was one of the best decisions he has ever made. “I don’t feel like working while I’m doing something I love.” However, the geek has other interests, such as snowboarding and traveling.
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