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

• Lib1172

Characteristics

Liberty-1172 is a memory resident, file infecting virus. It infects .COM files, including COMMAND.COM.

Upon infection, the Liberty-1172 virus becomes memory resident at the top of system memory but below the 640K DOS boundary. Interrupt 12's return is not moved. Interrupts 09 and 21 are hooked by Liberty-1172 in high system memory.

Once Liberty-1172 is memory resident, it infects .COM files, as they are executed.

It is not known what Liberty-1172 does besides replicate.

Additional Comments:
The Liberty-1172 virus was received in December, 1991. Its origin is unknown. Liberty-1172 is a memory resident infector of .COM programs, including COMMAND.COM. When the first Liberty-1172 virus infected program is executed, the Liberty-1172 virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,568 bytes. Interrupt 12's return will not have been moved. Interrupts 09 and 21 will be hooked by Liberty-1172 in high system memory. After Liberty-1172 has become memory resident, it will infect .COM programs, including COMMAND.COM, when they are executed. Infected programs will have a file length increase of 1,172 to 1,186 bytes. The virus will be located at the end of the file. The program's date and time in the DOS disk directory listing will have been updated to the system date and time when infection occurred. One text string can be found within the viral code in infected files: "Liberty" This text string will alo be found near the beginning of the file, which is how Liberty-1172 marks the file as being infected. It is unknown if Liberty-1172 does anything besides replicate.

Symptoms

One text string is found within the viral code in infected files:

"Liberty"

This text string is also found near the beginning of the file.

Total system and available free memory decreases by 1,568 bytes. Infected files have a file length increase of 1,172 to 1,186 bytes. The virus is located at the end of the file. The file's date and time in the DOS disk directory listing are updated to the system date and time 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

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

• Lib1172

Characteristics

Characteristics -

Liberty-1172 is a memory resident, file infecting virus. It infects .COM files, including COMMAND.COM.

Upon infection, the Liberty-1172 virus becomes memory resident at the top of system memory but below the 640K DOS boundary. Interrupt 12's return is not moved. Interrupts 09 and 21 are hooked by Liberty-1172 in high system memory.

Once Liberty-1172 is memory resident, it infects .COM files, as they are executed.

It is not known what Liberty-1172 does besides replicate.

Additional Comments:
The Liberty-1172 virus was received in December, 1991. Its origin is unknown. Liberty-1172 is a memory resident infector of .COM programs, including COMMAND.COM. When the first Liberty-1172 virus infected program is executed, the Liberty-1172 virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,568 bytes. Interrupt 12's return will not have been moved. Interrupts 09 and 21 will be hooked by Liberty-1172 in high system memory. After Liberty-1172 has become memory resident, it will infect .COM programs, including COMMAND.COM, when they are executed. Infected programs will have a file length increase of 1,172 to 1,186 bytes. The virus will be located at the end of the file. The program's date and time in the DOS disk directory listing will have been updated to the system date and time when infection occurred. One text string can be found within the viral code in infected files: "Liberty" This text string will alo be found near the beginning of the file, which is how Liberty-1172 marks the file as being infected. It is unknown if Liberty-1172 does anything besides replicate.

Symptoms

Symptoms -

One text string is found within the viral code in infected files:

"Liberty"

This text string is also found near the beginning of the file.

Total system and available free memory decreases by 1,568 bytes. Infected files have a file length increase of 1,172 to 1,186 bytes. The virus is located at the end of the file. The file's date and time in the DOS disk directory listing are updated to the system date and time of infection.

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