Threat Database Ransomware ZeroCool Ransomware

ZeroCool Ransomware

Among the many variants of ransomware that have emerged over the years, the ZeroCool Ransomware has earned a reputation for its ruthlessness. This threatening software infiltrates computer systems, encrypts valuable data, and requests a ransom in exchange for decryption. In this article, we will delve into the details of the ZeroCool Ransomware, including its distinctive characteristics and the potential consequences for victims.

The ZeroCool Ransomware at a Glance

The ZeroCool Ransomware is characterized by its distinctive behavior, leaving a clear signature that distinguishes it from other ransomware strains. One of its most noticeable features is the addition of a ".ZeroCoo" file extension to all encrypted files. This extension serves as an identifier, indicating that the files have been compromised and are no longer accessible to the victim.

Upon successfully encrypting the victim's data, the ZeroCool Ransomware proceeds to deliver its message through a ransom note. The ransom note is typically named "ZeroCool_Help.txt" and contains specific instructions on how to contact the attackers and pay the ransom.

The ZeroCool Ransomware provides two email addresses for victims to contact the attackers: and These email addresses serve as the primary means of communication between the victims and the cybercriminals responsible for the attack.

The ransom note issued by the ZeroCool Ransomware is not merely a demand for money; it also includes menacing threats designed to coerce victims into compliance.The note alerts that if the ransom is not paid, the attackers will divulge the victim's sensitive data on the TOR Dark Net.

The use of the TOR Dark Net amplifies the danger, as this encrypted network allows users to access websites anonymously, making it nearly impossible to trace the attackers. The threat of data exposure on the Dark Net serves as a potent incentive for victims to meet the attackers' demands.

To establish credibility and convince victims that they have the capability to decrypt the files, the ZeroCool Ransomware often offers a small olive branch. The attackers typically agree to decrypt one small file as proof of their decryption capabilities. This act is intended to instill a degree of trust in the victim, albeit a fragile one, and encourage them to make the ransom payment.

The Dangers of Paying Ransoms

While the idea of regaining access to encrypted files is tempting, cybersecurity experts and law enforcement agencies consistently advise against paying ransoms. There are several reasons for this:

  • No Guarantee: Paying the ransom does not give the victim assurance that the attackers will send the decryption tool or the files will be fully restored.
  • Funding Criminals: Ransom payments perpetuate the criminal activities of cyber attackers, providing them with the financial resources to continue their illegal operations.
  • Legal Consequences: Paying ransoms may have legal repercussions, as it may inadvertently involve victims in criminal activities.

Protecting against the ZeroCool Ransomware

The best defense against ransomware is a proactive approach to cybersecurity:

  • Backup Your Data: Regularly back up your essential files to an offline or cloud storage solution. This can ensure that even if your data is encrypted, you have a clean copy to restore.
  • Update Software: Keep your operating system and all software up to date, as vulnerabilities in outdated software can be exploited by ransomware.
  • Email Caution: Be wary of email attachments and links, especially from unknown senders. Ransomware often spreads through phishing emails.
  • Use Security Software: Invest in reliable anti-malware software to detect and prevent ransomware infections.

The ransom message from the ZeroCool Ransomware to its victims reads:


Your ID : -

In subject line please write your personal ID

Do not delete or modify encrypted files, it will lead to problems with decryption of files!

If you don't pay the ransom, the data will be published on our TOR darknet sites.
Keep in mind that once your data appears on our leak site, it could be bought by your competitors at any second, so don't hesitate for a long time.
The sooner you pay the ransom, the sooner your company will be safe.

What guarantee is there that we won't cheat you?
Send us ONE small encrypted files to emails listed below.
We will decrypt these files and send them back to you as a proof.'


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