A harmful program that silently integrates its own code into a program or file (referred to as the host file) on a computer.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting or renaming it.
Security programs will sometimes unintentionally identify a clean program or file as malicious if its code or behavior is similar to a known harmful program or file. This is known as a False Positive. In most cases, a False Positive is fixed in a subsequent database release.
Usually, updating your F-Secure security product to use the latest database is enough to resolve the issue. You can check by first updating your F-Secure security product to use the latest detection database updates, then rescanning the file.
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it to F-Secure Labs for re-analysis.
NOTE If the file was moved to quarantine, you will need to first collect the file from quarantine before you can submit it.
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.
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.
Viruses were once the most common type of harmful program found, with literally hundreds of thousands of viruses in the wild. Nowadays however, as modern software security practices have made it much harder for attackers to create functional viruses, most harmful programs found today are likely to be trojans.
A virus almost always arrives as an executable file. The virus file is most popularly distributed as an email attachment, or as part of a trojan's payload. Some viruses are distributed using more sophisticated distribution methods such as:
Other ways viruses can be spread are through removable media such as floppy disks, CDs or USB thumb drives.
Once the virus file is run, it begins its attack on the files on the computer. Each time a host file is run, the virus code in it will replicate - that is, it will create and insert more unwanted code, either into the same file or into another file on the same machine (essentially infecting the other file as well).
Viruses can be sub-categorized based on the type of files they are designed to infect. The most common sub-types are:
As the replication process repeats, the increasing additions of unwanted code can disrupt the host file's normal operations. If it happens often enough, the virus code can completely corrupt the host file. If enough files are infected, the entire computer may be completely disrupted.
In addition to infecting files, a virus can often perform other harmful actions. These actions can range from simple nuisances to severely harmful:
Depending on what other actions the virus performs, the impact of an infection can range from annoying to devastating.