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.
As hidden items are often related to malware, we ask that you consider sending us a sample of the hidden files to F-Secure Labs via the Submit A Sample (SAS) page for further analysis.
Since the files are hidden, you might not be able to access them directly. To access the files, you might need to do one of the following:
Alternatively, if the hidden files are related to the Master Boot Record (MBR), you may use the following instructions:
Caution: Manual disinfection of the MBR is only advisable for advanced users.
Microsoft provides tools to replace an infected MBR with a copy of the original, clean MBR. To do so:
Note: For further information on use of the 'fixmbr' command, please refer to the relevant Microsoft documentation.
Find the latest advice in our Community Knowledge Base.
See the manual for your F-Secure product on the Help Center.
Submit a file or URL for further analysis.
F-Secure products may detect the rootkit file itself using the detection names Rootkit.MBR.Whistler.A (boot image) or Rootkit.MBR.Whistler.B (boot image).
As with most rootkits, Whistler is used to help other malicious programs to silently launch themselves on an infected computer. The additional files loaded by the rootkit are stored in the raw disk sectors and are therefore not visible in the file system. These files, which are typically malware, may also be identified by detections such as Gen:Variant.Unruy.4.