The Frodo virus is one of the most advanced "stealth" viruses, and is quite successful in hiding from detection. If it is active in memory and you look at the directory, the virus will show you the original length of any infected program. In addition, it will intercept most attempts to read infected files, so only the original, non-infected file will be seen.
If CHKDSK is run while the virus is active, it will often detect an inconsistency in the number of disk blocks allocated to infected files, and their apparent length.
Frodo activates on Sept. 22. when it may attempt to place a Trojan on boot sectors. This Trojan will display the message "FRODO LIVES" in large letters on the screen, surrounded by a moving pattern. The code to write the Trojan to the disk seems to be garbled in all known versions of the virus and will probably "hang" the computer.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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.