Files with onion extension can be found as files encrypted and affected by a ransomware labeled as Dharma.

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ONION file - Dharma ransomware affected file

What is onion file? How to open onion files?

File type specification:

Ransomware encrypted file type icon Ransomware encrypted file type

File extension onion is used by a variant of ransomware called Dharma which much like other similar threats encrypts users files and demands bitcoins as ransom. It is distributed via .zip files downloaded from internet links provided in a spam email.

Help how to open:

The only way to access the original files is to use a decrypter - if it exists.

How to convert:

Once you have decrypted the affected files, you can convert the content.

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