Threat description




Trojan:W32/Cryptowall is a ransomware that silently encrypts files on the user's machine and demands a ransom to provide the decryption key needed to decrypt the files.


Automatic action

F-Secure detects ransomware using a variety of signature and generic detections. Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

Further 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.

Technical Details

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.

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If you believe you have encountered an undetected Cryptowall sample, please send it to us for analysis via our Submit A Sample (SAS) page.

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