Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: HLLC


HLLC is a family name - all companion viruses written in High Level Languages, such as Pascal, C, C++ or Basic, have been grouped under this name.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

There are several members, including the following viruses: HLLC.Even Beeper.A, HLLC.Even Beeper.B, HLLC.Even Beeper.C, HLLC.Even Beeper.D, HLLC.3351, HLLC.Globe.6610, HLLC.Globe.7705, HLLC.Halley, HLLC.Happy Monday.A, HLLC.Happy Monday.B, HLLC.Happy Monday.C, HLLC.16850.

These viruses spread by creating a companion program that will be executed before the original one.

Members of the HLLC family are rarely seen in the wild, but the chance of a false alarm is bigger than with viruses written in assembly language - this is because it is more difficult to find a distinct search string for these viruses.


Variant:Plane (HLLC.Plane)


This virus is written with Turbo Pascal.

When an infected file is executed, virus locates random EXE files and copies itself to the same directory with them, with a COM extension. Later on, these files get executed when users run programs without specifying the extension.

The companion files created by the virus are always 8304 bytes in size, and they are visible in the directory listings normally. This virus does not stay resident in memory.

HLLC.Plane activates by random. When it activates, it shows a character-based animation of a red plane flying past the screen and dropping a parachute in the middle of the screen.

HLLC.Plane was found in the wild in Finland in December 1996.

Description Details: Mikko Hypponen, F-Secure


Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More