Classification

Category :

Malware

Type :

Virus

Aliases :

Lyceum

Summary

Not yet analyzed.

Removal

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.

Technical Details

Variant:Lyceum-1788

Other:Resident, COM/EXE-files

Repair:Yes

When an infected file is executed, the virus goes memory resident and hooks three interrupts, 8h (timer), 9h (keyboard) and 21h (DOS). INT 8h increments an inactivity timer and INT 9h resets it. If no keyboard input occurs for about 30 minutes, a dialog box is put up on the screen and is removed at the next keystroke or after a further 30 minutes inactivity. The dialog box contains some unknown foreign text and it is encrypted in the virus code.

If the virus is active in memory, it will infect all files which are either executed or opened or their attributes changed. Infection is attempted on files in the current directory (including hidden files), matching either *.CO? or *.EX?. Virus also checks whether the file begins with AI*.* and if it does, the virus will not infect it.

Non-EXE files are not infected if they're smaller than 1kB or larger than 60kB. The infection signature is 0FCh as the last byte of the file. Virus adds 100 years to the years field in the file date and zeroes the second field. If the free disk space is less than 4 sectors, virus will not attempt infection.

Variant:Lyceum-1832

Other:Resident, COM/EXE-files

Repair:Yes

More advanced version, also able to infect EXE files. Probably written by the same author as other two variants of Lyceum virus.