Virus Database

Malign Family

Description Malign Family

These are not dangerous memory resident parasitic viruses. They hook INT 21h and when the DOS functions GetDisk or SetDisk are executed the viruses search for the COM-files and write themselves at their beginnings. Sometimes they display the string: "Malign". On read/write error the virus "Malign.630" displays also: "Wait".

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Emperor.5826

Description Emperor.5826

It is an extremely dangerous memory resident polymorphic multipartite virus about 6Kb of length. It infects DOS COM and EXE files by writing its code to the end of the file, and overwrites the MBR of the hard drive and boot sector on floppy disks with its own loading routine that installs the virus into the system memory on rebooting. The virus has many anti-debugging tricks, uses stealth functions and quite complex routines to get addresses of DOS kernel to bypass anti-virus protection.
The virus has bugs and in some cases it corrupts the files while infecting them, and they halt the system when executed.
When an infected file is run, the virus decrypts itself, checks for its TSR copy already installed in the system, and runs its installation routine. This routine allocates a block of DOS memory, copies virus code to there, hooks INT 12h, 13h, 21h and infects the MBR of the hard drive.
The virus INT 21h hooker intercepts file accessing calls, and runs infection and stealth routines. The INT 13h hooker does the same on the MBR and floppy disk boot sector reading/writing.
While infecting the MBR the virus uses several tricks to bypass anti-virus protection: writes data by direct calls to HDD controller ports; or stuffs 'Y' to keyboard buffer, in case the Megatrends or AWARD BIOS is installed and VirusWarning BIOS protection is enabled (the virus checks necessary field in the CMOS memory).
The virus stores the original MBR and boot sectors to the reserved sectors on the drive, but encrypts and corrupts this code so, that these data will work correctly only in case the virus TSR copy is active (i.e. only in case the disk is infected, the virus already installed its code into the memory and released control to the original bootstrap routine). The virus also patches the MBR DiskPartitionTable - it loops its tables. As a result it is not possible to load the system from clean MS DOS floppy disk, and it is necessary to use other DOS versions, or special tools to access the hard drive.
While infecting the MBR or floppy disk boot sector the virus checks it for some specific code, and erases the CMOS memory if this code is found, the message "Error in CMOS" is displayed then and computer halts.
The virus also has more dangerous destruction routine. It erases the data on the hard drive and corrupts the Flash BIOS in the same way the "Win95.CIH" (aka "Chernobyl") virus does. The virus at the same time displays the message:
EMPEROR
I will grind my hatred upon the loved ones.
Despair will be brought upon the hoping childs of happiness.
Wherever there is joy the hordes of the eclipse will pollute
sadness and hate under the reign of fear.
In the name of the almighty Emperorall.

This routine is executed if the virus founds an active debugger in the system memory, or the system is rebooted in period from 5am till 10am. This routine also may take control because of a bug in the virus code.
The virus also contains the text strings:
the EMPEROR virus
written by Lucrezia Borgia
In Colombia, 1999

Empire

Description Empire

It's a memory resident not dangerous stealth virus which hooks INT 13h and infects the floppy Boot-sectors. While loading from infected floppy it infects the hard drive MBR. All the sectors are infecting by the "Stoned" manner. It contains the text "PC AT", it also decrypts and types the large message:
I'm becoming a little confused as to where the "evil empire" is these days.
If we paid attention, if we cared, we would realize just how unethical this
impending war with Iraq is, and how impure the American motives are for
wanting to force it.
It is ironic that when Iran held American hostages, for a few lives the
Americans were willing to drag negotiation on for months; yet when oil is
held hostage, they are willing to sacrifice hundreds of thousands of lives,
and refuse to negotiate all....

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