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Poseidon Stealer: A threat for macOS users

Poseidon Stealer: A threat for macOS users

Poseidon Stealer: A threat for macOS users

What is Poseidon Stealer?

Poseidon Stealer is a malicious software (malware) specifically designed to infect macOS systems and steal sensitive data. This malware belongs to the category of so-called "stealers", whose main purpose is to capture confidential information such as passwords, credit card data, browser information and other personal data and transmit it to cybercriminals.

How is Poseidon Stealer distributed?

Poseidon Stealer is mainly distributed via "malspam" campaigns. In these campaigns, fraudulent emails are sent to a large number of recipients with the aim of tricking the victims into downloading and executing an infected file. A recent example of this is the use of the supposed sender AGOV, Switzerland's official government login. These emails contain links to seemingly legitimate websites that redirect the victims until they finally download and install the malicious software on their macOS device.

What damage does Poseidon Stealer cause?

Once Poseidon Stealer is installed on a macOS device, the malware can cause considerable damage:

  1. Data theft: Poseidon Stealer can steal a variety of data from the infected device, including:
    • Login data (user names and passwords) from web browsers and other applications
    • Credit card information
    • Browser history and stored cookies
    • E-mail addresses and content
    • System information and files
  2. Identity theft: The stolen data can be used to steal the victim's identity and carry out fraudulent activities in their name.
  3. Financial loss: Cyber criminals can cause financial damage with stolen credit card information or by selling the stolen data on the black market.
  4. Loss of privacy: Personal information and sensitive data can fall into the hands of criminals, putting the victim's privacy at considerable risk.

How can you protect yourself from Poseidon Stealer?

To protect against Poseidon Stealer and similar malware, users should take the following security measures:

  1. Be careful with e-mails: Be suspicious of unexpected e-mails, especially if they contain attachments or links. Check the sender's address carefully and do not click on suspicious links.
  2. Update your software: Make sure that your operating system and all installed programs are regularly updated to close known security gaps.
  3. Use anti-virus software: Install and update reliable antivirus software designed specifically for macOS to detect and prevent malware infections.
  4. Regular backups: Make regular backups of your important data so that you can restore it quickly in the event of an infection or data loss.
  5. Two-factor authentication (2FA): Enable two-factor authentication for your online accounts to add an extra layer of security.
  6. Secure passwords: Use strong, unique passwords for your accounts and change them regularly. A password manager can help you create and manage complex passwords.

What to do in the event of an infection?

If you suspect that your macOS device is infected with Poseidon Stealer, you should take the following steps immediately:

  1. Disconnect the device from the network: This prevents the malware from continuing to send data to the attackers.
  2. Scan the system: Perform a full system scan with updated antivirus software to identify and remove the malware.
  3. Reset the device: In severe cases, it may be necessary to completely reinstall the operating system to ensure that all traces of the malware have been removed.
  4. Change your passwords: Change all passwords for online accounts that may have been compromised.
  5. Contact your bank: If you suspect that your financial data has been stolen, inform your bank or credit card provider immediately.


Poseidon Stealer poses a serious threat to macOS users. By understanding how it spreads and the measures taken to prevent infection, users can protect their systems and personal data. Stay vigilant, update your software regularly and take proactive cybersecurity measures to protect yourself from such threats.

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Silvio Mazenauer

For more than 20 years, I've been helping our customers get up to speed with web hosting, domains, websites or cPanel. And I'm here to help you too.

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