McAfee > Theat Center > Virus Detail Page

Overview

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.

Characteristics

Hungarian 482 is a memory resident, overwriting, file infecting virus. It infects .COM files, including COMMAND.COM.

Upon infection, the virus becomes memory resident as a low system memory Terminate-and-Stay Resident (TSR). It hooks interrupt 21. Interrupt 12's return is moved. The TSR is in low available system memory, and the virus prevent its Terminate-and-Stay Resident (TSR) from being overwritten.

After Hungarian 482 is memory resident, it infects .COM files, other than very small ones, as they are executed.

Hungarian 482 does not do anything besides replicate.

Additional Comments:
The Hungarian 482 virus was isolated in Hungary in June, 1991 by Dr. Szegedi Imre. This virus is a memory resident infector of .COM programs, including COMMAND.COM. The first time a program infected with Hungarian 482 is executed, the virus will install itself as a low system memory TSR, hooking interrupt 21. Unlike with most viruses which use TSRs for memory residency, the DOS CHKDSK program will report no change in total system memory or available free memory. However, interrupt 12's return will have been moved. The TSR is in low available system memory, and the virus will prevent its TSR from being overwritten. After Hungarian 482 is memory resident, it will infect .COM programs, other than very small ones, as they are executed. If COMMAND.COM is executed, it will become infected. Infected .COM programs will increase in size by 482 bytes with the virus being located at the end of the infected file. There will be no change in the file date and time in the disk directory. Due to a bug in the Hungarian 482 code, it is possible that .EXE programs may become infected, though this will happen very rarely. Hungarian 482 does not do anything besides replicate.

Symptoms

Unlike with most viruses which use TSRs for memory residency, the DOS CHKDSK program reports no change in total system memory or available free memory. Infected .COM files increase in size by 482 bytes. The virus is located at the end of the infected file. There are no changes in the file date and time in the disk directory.

Due to a bug in the Hungarian 482 code, it is possible that .EXE files may become infected, though this happens very rarely.

Method of Infection

The only way to infect a computer with a file infecting virus is to execute an infected file on the computer. The infected file may come from a multitude of sources including: floppy diskettes, downloads through an online service, network, etc. Once the infected file is executed, the virus may activate.

Removal

All Users :
Script,Batch,Macro and non memory-resident:
Use current engine and DAT files for detection and removal.

PE,Trojan,Internet Worm and memory resident :
Use specified engine and DAT files for detection. To remove, boot to MS-DOS mode or use a boot diskette and use the command line scanner:

Additional Windows ME/XP removal considerations

Users should not trust file icons, particularly when receiving files from others via P2P clients, IRC, email or other mediums where users can share files.

AVERT Recommended Updates :

* Office2000 Updates

* Malformed Word Document Could Enable Macro to Run Automatically (Information/Patch )

* scriptlet.typelib/Eyedog vulnerability patch

* Outlook as an email attachment security update

* Exchange 5.5 post SP3 Information Store Patch 5.5.2652.42 - this patch corrects detection issues with GroupShield

For a list of attachments blocked by the Outlook patch and a general FAQ, visit this link .
Additionally, Network Administrators can configure this update using an available tool - visit this link for more information .

It is very common for macro viruses to disable options within Office applications for example in Word, the macro protection warning commonly is disabled. After cleaning macro viruses, ensure that your previously set options are again enabled.

Variants

Variants

N/A

All Information

Overview -

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.

Characteristics

Characteristics -

Hungarian 482 is a memory resident, overwriting, file infecting virus. It infects .COM files, including COMMAND.COM.

Upon infection, the virus becomes memory resident as a low system memory Terminate-and-Stay Resident (TSR). It hooks interrupt 21. Interrupt 12's return is moved. The TSR is in low available system memory, and the virus prevent its Terminate-and-Stay Resident (TSR) from being overwritten.

After Hungarian 482 is memory resident, it infects .COM files, other than very small ones, as they are executed.

Hungarian 482 does not do anything besides replicate.

Additional Comments:
The Hungarian 482 virus was isolated in Hungary in June, 1991 by Dr. Szegedi Imre. This virus is a memory resident infector of .COM programs, including COMMAND.COM. The first time a program infected with Hungarian 482 is executed, the virus will install itself as a low system memory TSR, hooking interrupt 21. Unlike with most viruses which use TSRs for memory residency, the DOS CHKDSK program will report no change in total system memory or available free memory. However, interrupt 12's return will have been moved. The TSR is in low available system memory, and the virus will prevent its TSR from being overwritten. After Hungarian 482 is memory resident, it will infect .COM programs, other than very small ones, as they are executed. If COMMAND.COM is executed, it will become infected. Infected .COM programs will increase in size by 482 bytes with the virus being located at the end of the infected file. There will be no change in the file date and time in the disk directory. Due to a bug in the Hungarian 482 code, it is possible that .EXE programs may become infected, though this will happen very rarely. Hungarian 482 does not do anything besides replicate.

Symptoms

Symptoms -

Unlike with most viruses which use TSRs for memory residency, the DOS CHKDSK program reports no change in total system memory or available free memory. Infected .COM files increase in size by 482 bytes. The virus is located at the end of the infected file. There are no changes in the file date and time in the disk directory.

Due to a bug in the Hungarian 482 code, it is possible that .EXE files may become infected, though this happens very rarely.

Method of Infection

Method of Infection -

The only way to infect a computer with a file infecting virus is to execute an infected file on the computer. The infected file may come from a multitude of sources including: floppy diskettes, downloads through an online service, network, etc. Once the infected file is executed, the virus may activate.

Removal -

Removal -

All Users :
Script,Batch,Macro and non memory-resident:
Use current engine and DAT files for detection and removal.

PE,Trojan,Internet Worm and memory resident :
Use specified engine and DAT files for detection. To remove, boot to MS-DOS mode or use a boot diskette and use the command line scanner:

Additional Windows ME/XP removal considerations

Users should not trust file icons, particularly when receiving files from others via P2P clients, IRC, email or other mediums where users can share files.

AVERT Recommended Updates :

* Office2000 Updates

* Malformed Word Document Could Enable Macro to Run Automatically (Information/Patch )

* scriptlet.typelib/Eyedog vulnerability patch

* Outlook as an email attachment security update

* Exchange 5.5 post SP3 Information Store Patch 5.5.2652.42 - this patch corrects detection issues with GroupShield

For a list of attachments blocked by the Outlook patch and a general FAQ, visit this link .
Additionally, Network Administrators can configure this update using an available tool - visit this link for more information .

It is very common for macro viruses to disable options within Office applications for example in Word, the macro protection warning commonly is disabled. After cleaning macro viruses, ensure that your previously set options are again enabled.

Variants

Variants -

N/A