Threat Descriptons

No Frills


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No Frills


No Frills is a resident file infector which infects both COM and EXE files.


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

When an infected file is executed, the virus will install itself in memory and reserve 1kB for itself. At this time virus hooks INT 21h.

INT 21h handler defines the residence test and intercepts dos functions 4Bh (load program), 3Dh (open file handle), 43h (get/set attribute) and 6Ch (extended open/create). All EXE files that start with 'MZ' or 'ZM' and whose names don't begin with "SC" are candidates for infection.

All COM files which do not have "CO" at the beginning of the filename are also candidates. Virus contains a copyright text inside its code which says '+-No Frills 2.0 by Harry McBungus-+'. Virus size is 843 bytes.

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