Sunjn Ransomware - a New VoidCrypt Variant that Encrypts Files

ransomware

Our team came across Sunjn, a malware belonging to the VoidCrypt ransomware family, while analyzing recent threat database submissions. Upon testing Sunjn on a test machine, we found that it encrypted files and altered their names by adding a unique identifier, the attacker's email address, and the ".sunjn" extension. For instance, a file named "1.jpg" became "1.jpg.MJ-ML6408927315.sunjn."

Once the encryption was completed, a ransom note titled "Decryption-guide.txt" was displayed on the desktop, informing the victim that their files have been encrypted and can only be unlocked through payment. The note also warned that any attempts to modify, rename, or recover the files using third-party tools or by reinstalling the operating system would lead to permanent data loss. The message also included instructions for contacting the attackers.

The Sunjn ransom note in full

The complete text of the "Decryption-guide.txt" file generated by the ransomware reads as follows:

Your Files Are Has Been Locked

Your Files Has Been Encrypted with cryptography Algorithm

If You Need Your Files And They are Important to You, Dont be shy Send Me an Email

Send Test File + The Key File on Your System (File Exist in C:/ProgramData example : RSAKEY-SE-24r6t523 pr RSAKEY.KEY) to Make Sure Your Files Can be Restored

Get Decryption Tool + RSA Key AND Instruction For Decryption Process

Attention:

1- Do Not Rename or Modify The Files (You May loose That file)

2- Do Not Try To Use 3rd Party Apps or Recovery Tools ( if You want to do that make an copy from Files and try on them and Waste Your time )

3-Do not Reinstall Operation System(Windows) You may loose the key File and Loose Your Files

Your Case ID :-

OUR Email :Sunjun3412@onionmail.org

in Case of no answer: Sunjun3416@zohomail.com

Why can you not recover your files if you become the victim of ransomware similar to Sunjn?

The files encrypted by ransomware like Sunjn are often locked using strong encryption algorithms that make it extremely difficult to recover the original data without the decryption key. The attackers typically demand payment in exchange for the decryption key and warn that any attempts to modify, rename, or recover the encrypted files using third-party tools or by reinstalling the operating system may result in permanent data loss. This is because the decryption process is often tied to specific conditions, such as the unique identifier or file name, and any changes to these conditions may prevent the decryption process from working properly.

What is the best way to protect your system and data from ransomware like Sunjn?

There is no foolproof way to protect your system and data from all types of ransomware, but you can reduce the risk of an attack and minimize the impact if one occurs by following these best practices:

  • Keep software up to date: Regularly update all software, including the operating system, web browsers, and applications to fix security vulnerabilities.
  • Use reliable anti-virus software: Install and regularly update anti-virus software to detect and prevent malware infections.
  • Create regular backups: Create and store regular backups of your important data to a separate, secure location to allow for data recovery in case of a ransomware attack.
  • Be cautious of suspicious email attachments and links: Do not open attachments or click links from unknown or untrusted sources, and always verify the sender before opening an attachment.
  • Enable the firewall: Enable the firewall on your computer to block unauthorized access and control incoming and outgoing network traffic.
  • Be careful when visiting websites: Avoid visiting suspicious or unsecured websites, as some may contain malware or phishing scams.
  • Enable network security: Use secure protocols, such as HTTPS, when accessing sensitive information online, and use a virtual private network (VPN) when using public Wi-Fi.

By following these tips, you can reduce the risk of a ransomware attack and minimize its impact on your system and data.

February 3, 2023
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