The HTML file contains a ransom-demand message in Russian, which details the encryption and encourages victims to follow instructions provided on Spora's website. As well as encrypting files, Spora disables Windows Startup Repair, deletes shadow volume copies, and changes BootStatusPolicy. In addition, the private key is also encrypted using AES cryptography, making the situation even worse. Decryption without the private key is impossible. As mentioned above, the files are encrypted using RSA (an asymmetric encryption algorithm) and, thus, public (encryption) and private (decryption) keys are generated during the encryption process.
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One of the main advantages of Spora to the developers is the ability to work offline (without an Internet connection). KEY files (both named using random characters), placing them in all folders that contain encrypted files. Following successful encryption, Spora generate a.
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This is being performed to trick victims into believing that the download of email attachments has failed.
This file is corrupted and, thus, an error will be displayed once opened. The aforementioned HTA file also extracts a DOCX file. Note that, unlike other ransomware-type viruses, Spora does not rename encrypted files. The executable then starts to encrypt files using RSA cryptography. The Javascript file extracts an executable with a random name and runs it. Each rogue email contains an HTA file which, once executed, extracts a Javascript file (" closed.js"), placing it in the system " %Temp%" folder. Spora is a ransomware-type virus distributed via spam emails (malicious attachments).
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