Z1n Ransomware

While investigating malware threats, researchers have identified the Z1n Ransomware, shedding light on its malicious nature. Z1n operates as a ransomware variant, employing a technique where it encrypts data on compromised devices and subsequently demands a ransom for decryption.

Upon execution on targeted devices, Z1n encrypts files, rendering them inaccessible and modifying their filenames. The original file titles undergo a transformation, with an exclusive ID assigned to the victim, the attackers' email address, and a '.z1n' extension appended. For instance, a file originally named '1.doc' would be transformed into '1.jpg.id-9ECFA74E.[zohodzin@tuta.io].z1n.'

Following the encryption process, Z1n generates ransom notes in the form of a pop-up window and a text file named 'read.txt.' Notably, the ransom notes delivered as text files are deposited on the desktop and within all encrypted directories. A significant revelation from the researchers is that Z1n is affiliated with the Dharma Ransomware family, providing insights into its classification and origin.

The Z1n Ransomware Can Cause Significant Damage to Infected Devices

Z1n is identified as a member of the Dharma Ransomware family, which distinguishes itself by avoiding rendering the infected device inoperable through the deliberate omission of encrypting critical system files. Notably, this strategic approach aims to ensure that essential system functions remain unaffected, allowing the infected device to remain operational despite the ransomware activity.

In addition to this unique characteristic, the Dharma Ransomware variants, including Z1n, exhibit a sophisticated behavior of gathering geolocation data post-infiltration. This data is then utilized to assess the feasibility of proceeding with encryption, with considerations such as avoiding machines located in economically weak regions or those in countries with aligning political or geopolitical ideologies.

Upon infiltrating a system, these ransomware programs disable the firewall and establish persistence through two mechanisms. Firstly, by copying the malware to the %LOCALAPPDATA% path and registering it with specific Run keys, and secondly, by automatically initiating the malware following each system reboot.

Dharma ransomware, including Z1n, employs an encryption strategy that encompasses both local and network-shared files. To prevent exemptions due to files being considered "in use," the ransomware terminates processes associated with opened files, including database programs and text file readers.

A notable feature is the ransomware's effort to avoid double-encryption by following an exclusion list for data already locked by other ransomware. However, it is acknowledged that this process is not foolproof, as it may not cover all infections of a similar nature. Dharma further complicates data recovery options by deleting the Shadow Volume Copies, limiting the potential avenues for restoring encrypted files.

Victims of the Z1n Ransomware Are Left with Instructions to Make Ransom Payments

The text file associated with the Z1n Ransomware serves as a brief communication to the victim, notifying them that their data has been locked. It encourages the victim to establish contact with the attackers to initiate the recovery process. On the other hand, the pop-up message accompanying the ransomware infection provides more detailed information. It explicitly mentions that the files rendered inaccessible have been encrypted. While the note refrains from explicitly stating that paying a ransom is necessary for decryption, it strongly implies such a requirement.

In an attempt to provide a semblance of a recovery guarantee, the message extends an offer for a free decryption test. This test allows the victim to assess the possibility of recovery on three files, each not exceeding 5MB in size and devoid of critical data. However, it is noteworthy that the victim is cautioned against seeking assistance from third parties (intermediaries) and advised against making modifications to the affected files. These warnings underscore the ransomware operators' emphasis on direct communication and adherence to their specified processes for potential data recovery.

Experts Discourage Giving Any Money to Cybercriminals

The decryption of files encrypted by ransomware threats typically requires the intervention of the attackers, making recovery a challenging process. Exceptions to this rule are rare and often involve instances where the ransomware has significant flaws.

Victims who comply with ransom demands may still find themselves without the necessary decryption keys or tools. This unpredictability underscores the unreliability of cybercriminals in delivering on promises, making it strongly advised against making any payments or following instructions from these malicious actors. Engaging in such actions not only fails to guarantee file recovery but also supports and perpetuates the criminal activity.

It's crucial to note that while removing ransomware from the operating system prevents further encryptions, it does not automatically restore previously compromised data. To enhance data safety, it is recommended to maintain backups in multiple locations, such as unplugged storage devices and remote servers. This multi-faceted approach to backup storage helps mitigate the impact of ransomware attacks and ensures a more robust data recovery strategy.

The ransom note that is shown to victims in a pop-up window is:

'All your files have been encrypted!

Don't worry, you can return all your files!
If you want to restore them, write to the mail: zohodzin@tuta.io YOUR ID -
If you have not answered by mail within 12 hours, write to us by another mail:zohodzin@cock.li

We strongly recommend that you do not use the services of intermediaries and first check the prices and conditions directly with us.

The use of intermediaries may involve risks such as:
-Overcharging: Intermediaries may charge inflated prices, resulting in improper additional costs to you.

-Unjustified debit: There is a risk that your money may be stolen by intermediaries for personal use and they may claim that we did it.

-Rejection of the transaction and termination of communication: Intermediaries may refuse to cooperate for personal reasons, which may result in termination of communication and make it difficult to resolve issues.

We understand that data loss can be a critical issue, and we are proud to provide you with encrypted data recovery services. We strive to provide you with the highest level of confidence in our abilities and offer the following guarantees:
---Recovery demo: We provide the ability to decrypt up to three files up to 5 MB in size on a demo basis.

Please note that these files should not contain important and critical data.

Demo recovery is intended to demonstrate our skills and capabilities.

---Guaranteed Quality: We promise that when we undertake your data recovery, we will work with the utmost professionalism and attention to detail to ensure the best possible results.

We use advanced technology and techniques to maximize the likelihood of a successful recovery.

---Transparent communication: Our team is always available to answer your questions and provide you with up-to-date information about the data recovery process.

We appreciate your participation and feedback.

Attention!
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

The text files created by Z1n Ransomware contain the following message:

all your data has been locked us

You want to return?

write email zohodzin@tuta.io or zohodzin@cock.li'