Threat Detail

  • Malware Type: Virus
  • Malware Sub-type: File Infector
  • Protection Added: 1998-11-30

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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Malware Proliferation

AIDS is an overwriting, file infecting virus. It infects .COM and .EXE files.

Each time an infected file is executed, the AIDS virus may infect a .COM or .EXE file.

Additional Comments:
The AIDS virus, also known as the Hahaha virus in Europe and referred to as the Taunt virus by IBM, is a generic .COM and .EXE file infector. When the virus activates, it displays the message "Your computer now has AIDS", with AIDS covering about half of the screen. The system is then halted, and must be powered down and rebooted to restart it. Since this virus overwrites the first 13,952 bytes of the executable program, the files must be deleted and replaced with clean copies in order to remove the virus. It is not possible to recover the overwritten portion of the program. Note: this is NOT the Aids Info Disk/PC Cyborg Trojan. Known variant(s) of AIDS are:

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.

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.
When the virus activates, it displays the message

Your computer now has AIDS

The system locked, and must be rebooted.

The virus overwrites the first 13,952 bytes of the executable files, making them unrecoverable, they must be deleted. The file can only be restored through a backup.