Qarj uses a unique key to encrypt files, which means that the same key cannot be used to decrypt files on different computers. It can also encrypt files stored on cloud storage or connected drives. The Qarj ransomware is a type of malware that encrypts almost all files on a victim’s computer, including documents, databases, pictures, and other types of files, but excludes Windows system files and files named “_readme.txt” to prevent the computer from crashing. Screenshot of files encrypted by Qarj virus (‘.Qarj’ file extension): This file contains the ransom message that the attackers want victims to see. Qarj renames encrypted files by adding the “.Qarj” extension to their names and creates a “_readme.txt” file in each folder where encrypted files are stored. The ransomware works by demanding a ransom from victims in exchange for the decryption of their files.

Qarj is a variant of a ransomware called STOP, which is known for its ability to encrypt victims’ data using a powerful encryption algorithm.

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