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

• 1804

• Dashel

Characteristics

Dashel.1804 is a file infecting virus. It does not become memory resident. It infects .EXE files.

Each time an infected file is executed, the 1804 virus infects one .EXE file in the current directory.

It is not known what 1804 does besides replicate.

Additional Comments:
The 1804 virus was received from Germany in January, 1993. 1804 is a non-resident, direct action infector of .EXE programs. When a program infected with the 1804 virus is executed, the 1804 virus will infect one .EXE file located in the current directory. Infected programs will usually have a file length increase of 1,804 bytes, though occassionally the file length increase will be 1,805 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 current system date and time. No text strings are visible within the viral code. It is unknown what 1804 does besides replicate.

Symptoms

Infected files usually have a file length increase of 1,804 bytes, though occasionally the file length increase will be 1,805 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 current system date and time.

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.

Aliases

• 1804

• Dashel

Characteristics

Characteristics -

Dashel.1804 is a file infecting virus. It does not become memory resident. It infects .EXE files.

Each time an infected file is executed, the 1804 virus infects one .EXE file in the current directory.

It is not known what 1804 does besides replicate.

Additional Comments:
The 1804 virus was received from Germany in January, 1993. 1804 is a non-resident, direct action infector of .EXE programs. When a program infected with the 1804 virus is executed, the 1804 virus will infect one .EXE file located in the current directory. Infected programs will usually have a file length increase of 1,804 bytes, though occassionally the file length increase will be 1,805 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 current system date and time. No text strings are visible within the viral code. It is unknown what 1804 does besides replicate.

Symptoms

Symptoms -

Infected files usually have a file length increase of 1,804 bytes, though occasionally the file length increase will be 1,805 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 current system date and time.

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