![]() ![]() ![]() ![]() It is also stated that this must be paid within seven days after encryption, otherwise the keys are permanently deleted (overwritten by other people's keys). The message states that to receive their keys and restore data, each victim must pay a ransom. Victims cannot access their keys, since developers store them on a remote server. If this is the case, each victim gets a unique decryption key (also known as a private key) which is necessary to restore data. It is stated that data is encrypted using RSA-1024 cryptography, which is asymmetric. It also states that files are encrypted and that the victim must contact cyber criminals to restore them, however, the message also specifies that decryption requires a unique key, which is unfortunately accurate. The pop-up, on the other hand, provides a bit more information. The new text file contains a short message simply stating that data is encrypted and that victims must contact cyber criminals via the email address provided. Therefore, " sample.jpg" might be renamed to a filename such as " In addition to encrypting data, Jack stores the " RETURN FILES.txt" text file on the desktop and opens a pop-up window. JACK GROUP RANSOMWHERE 32M PAGETECHCRUNCH PLUSjack" extension plus the victim's unique ID and developer's email address. After successful infiltration, Jack encrypts most stored data and appends filenames with the ". This malware was first discovered by cyber security researcher, Jakub Kroustek. Jack is high-risk ransomware that belongs to a family of ransomware infections called Dharma. ![]()
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