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

Jerusalem 1663 is a memory resident, file infecting virus. It infects .COM and .EXE files, including COMMAND.COM.

Upon infection, the Jerusalem 1663 virus becomes memory resident as a low system memory Terminate-and-Stay Resident (TSR) of 2,432 bytes. Interrupts 13 and 21 are hooked.

Once memory resident, Jerusalem 1663 infects files, as they are executed.

It is not known what Jerusalem 1663 does besides replicate.

Additional Comments:
The Jerusalem 1663 virus was received in October, 1992. Its origin or point of isolation is unknown. Jerusalem 1663 is a memory resident infector of .COM and .EXE programs, including COMMAND.COM. The first time a program infected with the Jerusalem 1663 virus is executed, the Jersalem 1663 virus will install itself memory resident as a low system memory TSR of 2,432 bytes. Interrupts 13 and 21 will be hooked. Once memory resident, Jersalem 1663 will infect programs, including COMMAND.COM, when they are executed. Both .COM and .EXE programs will increase in size by 1,663 bytes with the virus being located at the end of the file. The virus cannot recognize a previous infection on a file. Both .COM and .EXE programs may become reinfected, adding 1,663 bytes with each reinfection. The file's date and time in the DOS disk directory listing will not be altered. No text strings are visible within the viral code. It is unknown what Jerusalem 1663 does besides replicate.

Symptoms

Both .COM and .EXE files increase in size by 1,663 bytes. The virus is located at the end of the file. The virus cannot recognize a previous infection on a file, thus it may reinfect files, adding 1,663 bytes with each reinfection. The file's date and time in the DOS disk directory listing are not altered.

No text strings are visible within the viral code.

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 -

Jerusalem 1663 is a memory resident, file infecting virus. It infects .COM and .EXE files, including COMMAND.COM.

Upon infection, the Jerusalem 1663 virus becomes memory resident as a low system memory Terminate-and-Stay Resident (TSR) of 2,432 bytes. Interrupts 13 and 21 are hooked.

Once memory resident, Jerusalem 1663 infects files, as they are executed.

It is not known what Jerusalem 1663 does besides replicate.

Additional Comments:
The Jerusalem 1663 virus was received in October, 1992. Its origin or point of isolation is unknown. Jerusalem 1663 is a memory resident infector of .COM and .EXE programs, including COMMAND.COM. The first time a program infected with the Jerusalem 1663 virus is executed, the Jersalem 1663 virus will install itself memory resident as a low system memory TSR of 2,432 bytes. Interrupts 13 and 21 will be hooked. Once memory resident, Jersalem 1663 will infect programs, including COMMAND.COM, when they are executed. Both .COM and .EXE programs will increase in size by 1,663 bytes with the virus being located at the end of the file. The virus cannot recognize a previous infection on a file. Both .COM and .EXE programs may become reinfected, adding 1,663 bytes with each reinfection. The file's date and time in the DOS disk directory listing will not be altered. No text strings are visible within the viral code. It is unknown what Jerusalem 1663 does besides replicate.

Symptoms

Symptoms -

Both .COM and .EXE files increase in size by 1,663 bytes. The virus is located at the end of the file. The virus cannot recognize a previous infection on a file, thus it may reinfect files, adding 1,663 bytes with each reinfection. The file's date and time in the DOS disk directory listing are not altered.

No text strings are visible within the viral code.

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