F-Secure detects ransomware using a variety of signature and generic detections. Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
If the ransomware uses encryption to take files or an entire system hostage, the encryption may be sufficient to make it very difficult to decrypt the files without the necessary decryption key.
In such circumstances, the recommended course of action is to report the crime to the relevant authorities and restore the affected data from a backup.
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Cryptowall is ransomware that is reportedly spread in malicious file attachments to email messages; through downloads of malicious programs from compromised sites; and in the payloads of other malware.
When the Cryptowall malware run on a computer, it encrypts files stored on the machine, then displays a message informing the user that a decryption key must be purchased in order to recover access to the files held at ransom. Payment is typically requested in the Bitcoin digital currency.
If you believe you have encountered an undetected Cryptowall sample, please send it to us for analysis via our Submit A Sample (SAS) page.