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.
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Minimum DAT
4002 (1998-12-02) Updated DAT4397 (2004-10-06) |
Minimum Engine
5.1.00 File Length340 Bytes |
Description Added
1992-05-15 Description Modified1992-05-15 |
Malware Proliferation
Characteristics
Upon infection, the Boojum virus becomes memory resident at the top of system memory but below the 640K DOS boundary. Interrupt 12's return is not moved. Interrupt 21 is hooked by Boojum in memory.
Once the Boojum virus is memory resident, it infects .EXE files as they are executed.
Additional Comments:
The Boojum virus was received in May, 1992. Its origin or point of
isolation are unknown. Boojum is a memory resident infector of
.EXE programs.
When the first program infected with the Boojum virus is executed,
the Boojum virus will install itself memory resident at the top of
system memory but below the 640K DOS boundary. Interrupt 12's
return will not be moved. Total system and available free memory,
as indicated by the DOS CHKDSK program, will have decreased by
368 bytes. Interrupt 21 will be hooked by Boojum in memory.
Once the Boojum virus is memory resident, it will infect .EXE
programs when they are executed. Infected programs will have a
file length increase of 340 to 350 bytes with the virus being
located at the end of the infected file. The program's date and
time in the DOS disk directory listing will not be altered. No
text strings are visible within the viral code in Boojum infected
programs.
Boojum doesn't do anything besides replicate.
Symptoms
No text strings are visible within the viral code in Boojum infected files.
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 :
* 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