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Virus Profile: Delta.1163

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 6/1/1996
Date Added: 6/15/1996
Origin: Brazil
Length: 1,163 Bytes
Type: Virus
Subtype: File Infector
DAT Required: 4002
Removal Instructions
   
 
 
   

Description

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.

Indication of Infection

Delta.1163 contains the following text string:

"Good bytes from (DEL)ta Virus!!!"

The virus is triggered on November 9 (any year). On this date, the payload for Delta.1163 is the erasure of CMOS and to display the above text string.

Infected files increase in length by 1,163 bytes. The virus is located at the end of the infected file.

Methods 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.
   

Virus Characteristics

Delta.1163 is an encrypting, memory resident, file infecting virus. Delta.1163 infects .COM and .EXE files.

Upon infection, Delta.1163 becomes memory resident. It hooks interrupt 21h. Interrupt 6B is also called.

   
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:

SCANPM /ADL /CLEAN /ALL

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.