Virus Database

Einvolk.521

Description Einvolk.521

This is a non-memory resident parasitic virus. It searches for COM files of the current and parent subdirectories and writes itself to the end of the files that are found.
This is a dangerous virus. In November, it formats hard drive sectors and displays:
Big brother is watching you.
Virus Factory 93

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Hydra_II Family

Description Hydra_II Family

These are not dangerous memory resident parasitic polymorphic viruses. They hook INT 21h and write themselves to the end of EXE files that are executed.
Depending on the system date "Hydra_II.1162" displays:
This is Hydra v1.0.
Don`t panic, I will not destroy your data.

If the day number is equal to the month number "Hydra_II.1649" manifests itself with a video effect and then displays the message:
This is Hydra v1.1.
Don`t panic, I will not destroy your data.

Hymn.1865.a

Description Hymn.1865.a

This is a very dangerous memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of COM and EXE files that are executed, closed, renamed or when the file attributes are changed.
When the date and month correspond in number (January 1st, February 2nd,all), this virus destroys a part of the system information in the C: disk boot sector, then it plays the former USSR national anthem, and decrypts and displays the picture.
When corrupting the boot sector, the virus sets the bytes to zero in the boot sector that contains the number of bytes in a sector, number of sectors in a cluster, number of FAT copies, etc - a total 9 bytes. If the boot sector of a computer running in the MS-DOS environment is changed in such a way, the computer remains unbootable both from the hard disk and the floppy drive. To restore information, it is necessary to use special utilities.

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