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.

Aliases

• 3Y

• 3Y.853

Characteristics

3Y.853 is a memory resident, file infecting virus. It infects .COM files. It does not infect COMMAND.COM.

Upon infection, the 3Y.853 virus becomes memory resident at the top of system memory but below the 640K DOS boundary. It does not move interrupt 12's return. Interrupt 21 is hooked by the virus in memory.

Once the 3Y.853 virus is memory resident, it may infect .COM files as they are executed, though it does not infect all .COM files.

It is not known what 3Y.853 does besides replicate.

Additional Comments:
The 3Y virus was received in July, 1994. Its origin or point of isolation is unknown. 3Y is a memory resident infector of .COM files, but not COMMAND.COM. When the first 3Y infected program is executed, the 3Y virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,328 bytes. Interrupt 21 will be hooked by the virus in memory. Once the 3Y virus is memory resident, it may infect .COM files when they are executed, though it does not infect all .COM files. Infected programs will have a file length increase of 853 bytes with the virus being located at the end of the file. The program's date and time in the DOS disk directory listing will not be altered. The following text strings are visible within the viral code in all infected files: "COMMAND." "3Y_06b.COM Ver0.6b Copyright 1992 3Y2H" "R3Y_06a.EXE" It is unknown what 3Y does besides replicate.

Symptoms

The following text strings are visible within the viral code in all infected files:

"COMMAND."
"3Y_06b.COM Ver0.6b Copyright 1992 3Y2H"
"R3Y_06a.EXE"

Total system and available free memory decreases by 1,328 bytes. Infected files have a file length increase of 853 bytes. The virus is located at the end of the file. The file's date and time in the DOS disk directory listing are not altered.

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.

Aliases

• 3Y

• 3Y.853

Characteristics

Characteristics -

3Y.853 is a memory resident, file infecting virus. It infects .COM files. It does not infect COMMAND.COM.

Upon infection, the 3Y.853 virus becomes memory resident at the top of system memory but below the 640K DOS boundary. It does not move interrupt 12's return. Interrupt 21 is hooked by the virus in memory.

Once the 3Y.853 virus is memory resident, it may infect .COM files as they are executed, though it does not infect all .COM files.

It is not known what 3Y.853 does besides replicate.

Additional Comments:
The 3Y virus was received in July, 1994. Its origin or point of isolation is unknown. 3Y is a memory resident infector of .COM files, but not COMMAND.COM. When the first 3Y infected program is executed, the 3Y virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,328 bytes. Interrupt 21 will be hooked by the virus in memory. Once the 3Y virus is memory resident, it may infect .COM files when they are executed, though it does not infect all .COM files. Infected programs will have a file length increase of 853 bytes with the virus being located at the end of the file. The program's date and time in the DOS disk directory listing will not be altered. The following text strings are visible within the viral code in all infected files: "COMMAND." "3Y_06b.COM Ver0.6b Copyright 1992 3Y2H" "R3Y_06a.EXE" It is unknown what 3Y does besides replicate.

Symptoms

Symptoms -

The following text strings are visible within the viral code in all infected files:

"COMMAND."
"3Y_06b.COM Ver0.6b Copyright 1992 3Y2H"
"R3Y_06a.EXE"

Total system and available free memory decreases by 1,328 bytes. Infected files have a file length increase of 853 bytes. The virus is located at the end of the file. The file's date and time in the DOS disk directory listing are not altered.

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