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.
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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.
See: HLL, HLLO.
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.