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WWKA ransomware is a new variant of STOP/DJVU file-encrypting virus. It is designed to attack computers and encrypt all files on them using RSA Salsa20 algorithm. Once the virus affects all personal files, it leaves _readme.txt notes from cybercriminals who demand paying a ransom for data decryption. To make affected files distinguishable, the virus marks them with additional .wwka extension after encryption. For example, a file originally called 1.jpg will appear as 1.jpg.wwka after modification. As explained in the ransom note, the virus’ developers suggest buying WWKA decryption tool for a specified price which depends on how fast the victim writes to the attackers. If one does this within 3 days, the ransom price will be $490, otherwise – $980. The only way to contact the criminals is writing to provided emails: manager@mailtemp.ch or helpmanager@airmail.cc.
The primary aim of WWKA ransomware is to extort the owner of the infected computer by keeping one’s files hostage. The encryption method is considered military-grade, therefore the attackers expect that the victim will listen to their demands’ and pay the ransom as requested. We must mention a specific detail about the whole file modification process – the ransomware encrypts only the first 150 KB of each file, which makes file inaccessible and doesn’t slow down the whole attack time. However, this also allows restoring certain file formats as described in this guide.
WWKA decryption tool price depends on how fast the victim writes to the attackers. If the victim contacts the attackers within 72 hours and manages to settle an agreement (and of course, pay the ransom), the criminals will offer 50% discount which means the tool and unique decryption key costs $490. Otherwise, the price will bounce back to full amount – $980. Of course, the attackers want to receive the payment in untraceable way and that is why they demand paying in cryptocurrency. This requires the victim to purchase Bitcoin worth specified amount and transferring it to criminals’ wallet. To encourage the victim to believe in them, the attackers offer test decryption service on one small file.
Geek’s Advice team as well as FBI recommend you to NOT PAY THE RANSOM. Some of the reasons why it is wrongful and not worth doing so are:
WWKA ransomware begins the attack by running a deceptive process called winupdate.exe, which launches a fake Windows update prompt on the screen. This method is used to trick the victim into thinking that computer slowdown is caused by system updates and not something malicious. Meanwhile, the virus also executes another process that encrypts all files on the system. Additionally, the virus runs a Command Prompt command that deletes Volume Shadow Copies from the computer:
vssadmin.exe Delete Shadows /All /Quiet
This prevents the victim from restoring encrypted files with the help of System Restore Points (if any were created prior to the cyberattack). The next thing this virus does is adding a list of domains to Windows HOSTS file to prevent the victim from accessing them. This file is used to map domains to localhost IP in order to prevent the computer user from reaching certain websites. Once the victim attempts to visit one of these sites, DNS_PROBE_FINISHED_NXDOMAIN error will show up in web browser. It has been noticed that the virus tries to block websites that publish how-to articles and relevant cybersecurity-related information. In other words, it seems that virus’ developers seek to prevent the victim from reaching self-help information online. Finally, the ransomware drops bowsakkdestx.txt (contains victim’s public encryption key and personal ID) and PersonalID.txt (only includes victim’s identification string) on victim’s computer.
Victims of WWKA virus should keep in mind that certain STOP/DJVU versions can drag AZORULT Trojan into the already compromised computer. This Remote Access Trojan (RAT) can be used to perform various tasks on victim’s computer remotely.
Considering the amount of damage this malware caused to your computer, we strongly recommend you to remove WWKA ransomware virus from your computer as fast as you can. For that, we suggest following the instructions given below along with professional security program such as INTEGO Antivirus. Additionally, we recommend scanning your PC with RESTORO to repair virus damage on Windows OS files.
Name | WWKA Ransomware Virus |
Type | Ransomware; Crypto-malware; Virtual Extortion Virus |
Family | STOP/DJVU |
Encryption type | RSA Salsa20 |
Previous versions | VTYM, KQGS, XCBG, BPQD, EYRV, UIGD, VLFF (find full list here) |
Version | 315th |
Extension | .wwka |
Dropper | SmokeLoader (see VirusTotal details) |
Damage | The virus infects computers using stealthy techniques and then encrypts victim’s personal files using RSA Salsa20 encryption algorithms. The virus also appends .wwka extension to each file, saves _readme.txt notes and removes Volume Shadow Copies from the system. Finally, it uploads a list of blocked domain names to Windows HOSTS file. |
Ransom note | _readme.txt |
Ransom demand | $490-$980 in Bitcoin |
Distribution | Hides in illegal torrent downloads, cracked software, key generators or tools like KMSPico. |
Detection names | Trojan:Win32/Glupteba (Microsoft), VHO:Trojan-Spy.Win32.Stealer.gen (Kaspersky), Gen:Variant.Graftor.974954 (BitDefender), ML.Attribute.HighConfidence (Symantec), W32.Trojan.Gen (Webroot) see all detection name variations on VirusTotal |
Removal | Remove ransomware and related malware from your PC using professional software of your choice. We highly recommend using INTEGO Antivirus. To repair virus damage on Windows OS files, consider scanning with RESTORO. |
REMOVE MALWARE & REPAIR VIRUS DAMAGE
1 Step. Get robust antivirus to remove existing threats and enable real-time protection
INTEGO Antivirus for Windows provides robust real-time protection, Web Shield against phishing and deceptive websites, blocks malicious downloads and blocks Zero-Day threats. Use it to remove ransomware and other viruses from your computer professionally.
2 Step. Repair Virus Damage on Windows Operating System Files
Download RESTORO to scan your system for FREE and 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.
Almost every STOP/DJVU malware variant, including WWKA ransomware, reaches victim’s computer along a malicious software crack or another illegal and copyright-protected torrent download. Victims have reported getting the infection after trying to illegally obtain these programs:
Cybercriminals know that many computer users are trying to get paid programs for free, therefore they set up a trap for them by uploading infectious downloads on various file-sharing sites. The worst part is that when trying to obtain programs illegally, victims are often willing to ignore their security software warnings and proceed to open the file even if it is marked as potentially malicious. If you want to avoid getting infected, we strongly advise choosing only legitimate sources to get your software from. Consider heading to official software developer’s or distributor’s website and paying for legitimate license if you wish to get a unique and working version of the program that you need. We can assure you that this is always cheaper to support software developers rather than greedy cybercriminals.
Viruses that fall into ransomware category are also distributed in a form of email attachments. The attackers compose infectious files in the following formats: DOCX, XLS, PDF and name them as invoice/pending payment/parcel delivery tracking details or similarly and attach them to deceptive emails which they send to mass of people. Typically, criminals get potential target email lists from various online data leaks. We strongly suggest looking for these signs that signal about potentially malicious email:
Geek’s Advice team experts suggest ignoring emails that you did not wait for or that seem even slightly suspicious. If something seems a bit off, or if you start questioning yourself “why am I getting this email”, delete the email and do not even consider opening its attachments or links included as they can lead to severe computer infection.
If you’ve fallen victim to this ransomware, we must warn you that there are a number of fake STOP/DJVU decryption tools online that can severely infect your computer with other ransomware strains, for instance, ZORAB. In other words, cybercriminals are trying to target and double-encrypt victims who desperately look for a way to decrypt their files. We can assure you that once a real decryption tool appears, all of the reputable cybersecurity-related sites will mention it in their news.
To secure your computer, we strongly recommend you to remove WWKA ransomware virus and take actions to prevent similar attacks in the future. To eliminate malware safely, you will need to follow the guide given below to boot into Safe Mode with Networking. For virus removal, we recommend using INTEGO Antivirus, which also provides robust real-time protection. Finally, download RESTORO and scan your PC to repair virus damage on Windows OS files.
Once you safely remove WWKA ransomware virus, you should take the following actions:
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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:
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WWKA ransomware virus Removal Guidelines
Before you try to remove WWKA 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
Instructions for Windows 8/8.1/10/11 users
Now, you can search for and remove WWKA 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, which also includes data recovery software. 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.
In order to use System Restore, you must have a system restore point, created either manually or automatically.
Instructions for Windows XP/Vista/7 users
Instructions for Windows 8/8.1/10/11 users
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.
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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.
STOP/DJVU ransomware versions are grouped into old and new variants. WWKA ransomware virus is considered the new STOP/DJVU variant, just like VTYM, KQGS, XCBG, BPQD, EYRV, UIGD, VLFF (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 WWKA files, follow the given tutorial.
The WWKA 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 WWKA 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.
Victims of WWKA ransomware virus should report the Internet crime incident to the official government fraud and scam website according to their country:
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.
You can only open WWKA 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 WWKA 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 WWKA 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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