Em 2015, os investigadores turcos, Utku Sen, publicaram o ransomware HiddenTear, o primeiro ransomware open-source para fins educacionais.
O código original foi decifrado pelos cryptoanalistas, por esse motivo, muitas outras variantes baseadas nele também foram surgindo ao longo do tempo.
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As vítimas do HiddenTear Ransomware podem seguir o procedimento passo a passo, publicado pela Bleeping Computer, para recuperar os ficheiros infetados de forma gratuita.
- Download the HT Brute Forcer.
- Extract the downloaded hidden-tear-bruteforcer.zip and execute the HiddenTear Bruteforcer.exe.
- Click on the Browse Sample button and choose an encrypted PNG file. Experts suggest choosing the smaller one.
- Click on the Start Bruteforce button to start brute forcing the decryption key. The process can take some time.
- When the tool has found the encryption key, the decryptor will automatically decrypt the test file and ask the users to determine if it was correctly decrypted.
- If the file was decrypted properly, users should save the discovered key and use it with the HiddenTear decryptor.
- Download the standalone HiddenTear decryptor.
- Double-click on the hidden-tear-decrypter.exe file to start the tool, enter the key that was discovered by the brute forcer and click on the Decrypt My Files button.
- Once the decryption process has finished, it will display a screen stating how many files were decrypted.
Pedro Tavares is a professional in the field of information security, working as an Ethical Hacker, Malware Analyst, Cybersecurity Analyst and also a Security Evangelist. He is also a founding member at CSIRT.UBI and Editor-in-Chief of the security computer blog seguranca-informatica.pt.
In recent years he has invested in the field of information security, exploring and analyzing a wide range of topics, such as pentesting (Kali Linux), malware, hacking, cybersecurity, IoT and security in computer networks. He is also Freelance Writer.
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