Trojan:W32/Nymaim

Classification

Malware

Trojan

W32

Trojan:W32/Nymaim

Summary

Trojan:W32/Nymaim is ransomware that is also capable of downloading additional malware onto the affected device.

Removal

Automatic action

F-Secure detects ransomware using a variety of signature and generic detections. Once detected, the F-Secure security product will automatically remove the file.

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.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Trojan:W32/Nymaim has been found to be delivered via exploit kits, or in files (typically using filenames related to popular keyword searches) that are downloaded from various malicious websites.

If Nymaim is launched on a device, it will attempt to either lock the screen or download additional malware. If the user is located in a country in Europe or North America, the malware will download a customized lockscreen for that particular country; the lockscreen will display the ransom demand. If the user is in a country for which no customized lockscreen is available, Nymain will download a second-stage component which can be used at a later time to download additional malware.