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Remove “File Decryption Help” Chinese Ransomware and Restore the .txt Locked Files

ransomware-chinese-sensorstechforumShujin ransomware, written entirely in Chinese has been reported on security forum to infect unsuspecting users. The ransom note is written entirely in Chinese, and the encoded files are in the .txt file extension. This particular ransomware, like many others, uses a strong encryption to encode the users’ data and extorts the users for the return of their files. Users who have been affected by this cyber threat should be aware that at this point there is no relevant decryption possibility. However, they can remove the threat and may restore their data using alternative methods such as the ones after this article.

Threat Summary

Name Shujin Ransomware
Type Ransomware
Short Description The ransomware encrypts files with a strong cypher and asks a ransom for decryption.
Symptoms Files are encrypted in the “.txt file extension” and become inaccessible. A ransom note with instructions for paying the ransom is written in Chinese.
Distribution Method Spam Emails, Email Attachments, File Sharing Networks.
Detection Tool See If Your System Has Been Affected by Shujin Ransomware

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User Experience Join our forum to Discuss Shujin Ransomware.

Shujin Ransomware – Spread

To be widely redistributed over the web, this particular crypto-malware may use a variety of methods. The most frequently met distribution tactics used by ransomware are the following:

  • Infection via malicious URLs posted on spam e-mail messages, social media messages and commends and chat messages.
  • Infections via redirects to malicious drive-by URLs caused by PUPs, for example, DNS Unlocker.
  • Distribution of the malicious files via obfuscated processes, pretending to be setups of programs or torrent files that users search for online for free download.

Whatever the method may be, once this ransomware is on your computer, it may execute scripts that enable it to slip onto the PC undetected by security software.

Shujin Ransomware In Detail

Once executed, the ransomware may deploy its malicious files in key windows folders. The folders vary, since the file formats may also vary. For example, if the modules for encryption it uses are .tmp files, they are usually dropped In the %Temp% folder. The names of the malicious files may also vary. Here are the common paths and filenames that Chinese Ransomware may utilize to infect your device:

commonly used file names and folders

After dropping its files, the ransomware may tamper with several key registry entries in the Windows Registry Editor. Users who have been infected by Chinese Ransomware should check the following registry entries:

→ HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\explorer\User Shell Folders
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\explorer\Shell Folders] HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\Software\CLASSES

After this is done, Chinese ransomware may execute a “call” script to launch the encryption process. It may scan through the infected to a computer for some of the most commonly used file types. After scanning the files are encrypted with the “.txt” file extension, for example:

→ Photo.jpg.txt

After the files are encoded they are unable to be opened and instead, users come to see a text file. Renaming the extension back to normal is reported not to help, pointing out to all of the files being rendered unusable.

Unlike other ransomware, this ransomware displays its message completely in Chinese. Here is how the message appears and to what it translates:

In English:“File decryption Help”:
All your documents on your computer, photos, work files, private files and other important files have been encrypted. To decrypt these files, run the on desktop tools; if you do not have this tool on your desktop, go to the root directory of each partition to find; if you still can not find the tool, read this help content;
Only by strictly follow the steps later time, to decrypt your files; do not use antivirus software or other tools to try to recover any files because this will destroy or delete the encrypted file, causing the file never recover!
You must first download and install the “Tor Browser”; please Baidu search “Tor Browser Chinese version of” find the download address, download, and install; installation or download directly from the official website http://torproject.org; if you are the first 1 using this browser, you may also need to Baidu search for “Tor browser using the” Get related tutorial;
Since the Tor network has been blocked, you may also need to use an overseas VPN or configure a proxy server for foreign Tor browser; if you do not know how to do this, search for relevant information or seek professional help on the Internet;
At the confirmation has been connected to the Tor network premise Tor enter the URL in your browser to access this site: HTTP: //eqlc75eumpb77ced.onion/, if the site is temporarily unable to open, please try again later to continue;
If the decryption tool has been lost, you can re-download from a website; run decryption tool, make sure that the antivirus software is turned off;
Open the Web site, copy the following machine code to enter and submit, then follow the prompts websites; If successful, you will receive a unique key, which will be able to decrypt all your files;
The following is your machine code
In Chinese:
《文件解密帮助》:
你电脑上的所有文档、照片、工作文件、隐私文件与及其它重要文件都已经被加密。要解密这些文件,请运行桌面上的<文件解密>工具;如果桌面上没有这个工具,请前往每一个分区的根目录下查找;如果仍然无法找到该工具,请继续阅读此帮助内容;
只有严格按照稍后提示的步骤进行,才能解密你的文件;请不要使用杀毒软件或者其它任何工具尝试恢复文件,因为这将会破坏或删除被加密的文件,导致文件永远无法恢复!
你首先要下载并安装《Tor浏览器》;请百度搜索”Tor浏览器中文版”,找到下载地址,下载并安装;或者直接从官网 http://torproject.org 上下载安装; 如果你是第1次使用此浏览器,你可能还需要百度搜索”Tor浏览器使用”获取相关的使用教程;
由于Tor网络已经被封锁,你可能还需要使用国外的VPN或者为Tor浏览器配置国外代理服务器;如果你并不懂得如何操作,请在网上搜索相关的资料或者寻求专业人员的帮助;
在确认已经连接上Tor网络的前提下,在Tor浏览器中输入网址访问此网站:http://87g98n0m87ug.onion/ ,如果网站暂时无法打开,请稍后继续重试;
如果解密工具已丢失,你可以从此网站上重新下载一个;运行解密工具的时候,请确保杀毒软件处于关闭状态;
打开网站后,复制以下机器码输入并提交,然后根据网站的提示进行操作;如果成功,你将获得一个唯一的密钥,这个密钥将可以解密你所有的文件;
以下是你的机器码:(请确保复制完整)

Users are strongly advised not to pay the ransom money by this Chinese Ransomware because the cyber-criminals have restored only a percentage of the files. Another reason not to pay is that you may fund the cybercriminal organization to further develop the ransomware and infect even more computers. Instead, we advise you to wipe this crypto-malware and use alternative tactics to get your files back.

Removing Shujin Ransomware and Restoring the Data May Be Tricky

If you want to remove the ransomware, you may run into some difficulties if you do it manually. This is because this virus may use different files and drop them in different locations every time. Not only this but Chinese ransomware, may prevent you from deleting the files by using escalated privileges. This is why we advise you to isolate and remove it by using the instructions below.

In case you are looking forward to restoring your data, make sure to follow our forum or this blog page for any updates. We will post one as soon as it is available. In the meantime, we suggest you try and see if you can restore your files via the methods which are illustrated in the step “Restore files encrypted by Chinese Ransomware”.

Manually delete Shujin Ransomware from your computer

Note! Substantial notification about the Shujin Ransomware threat: Manual removal of Shujin Ransomware requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.

1. Boot Your PC In Safe Mode to isolate and remove Shujin Ransomware files and objects
2.Find malicious files created by Shujin Ransomware on your PC
3.Fix registry entries created by Shujin Ransomware on your PC

Automatically remove Shujin Ransomware by downloading an advanced anti-malware program

1. Remove Shujin Ransomware with SpyHunter Anti-Malware Tool
2. Back up your data to secure it against infections and file encryption by Shujin Ransomware in the future
3. Restore files encrypted by Shujin Ransomware
Optional: Using Alternative Anti-Malware Tools

Vencislav Krustev

A network administrator and malware researcher at SensorsTechForum with passion for discovery of new shifts and innovations in cyber security. Strong believer in basic education of every user towards online safety.

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