S-Bug is a highly polymorphic virus that has been reported to be in the wild in USA and in several other locations.
Virus stays resident in memory occupying 9 KB's of DOS memory. It hooks the following INT 21h functions: 3Dh, 4Bh, and 6Ch. Infected files grow in size between 4k and 5k bytes.
Infected EXE and overlay files may fail to execute correctly. Virus includes string "Satan Bug virus - Little Loc".
The virus will only become resident if the environment variable COMSPEC= is set to point to a file called COMMAND.COM.
S-Bug virus also removes validation codes added to files by McAfee SCAN and CPAV's Immunize function.
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 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.
Variant:FruitFly
A related variant. Uses similar encryption, but the actual virus is simpler and non-resident.
See: Natas