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Toal


Aliases:


Toal
Win95/Toal@mm, I-Worm.Toil, BinLaden, Bin Laden, Osama Bin Laden

Malware
Worm
W32

Summary

Toal is an e-mail virus-worm. It uses ICQ White Pages to look for e-mail addresses so the spreading is limited to ICQ users. It also has functionality to spread trough local network but due to a programming error the worm crashes when it tries to browse the network.

The virus does not work on Windows NT system due to a Windows 9x/ME specific property.

The origin is most likely Brasil (judging from the messages it has inside). By the time of description creation the worm was not in the wild.



Disinfection & Removal

Since the virus infects 'explorer.exe' that is always locked the system must be cleaned from DOS.

The virus shares the C: drive with full access so that share has to be removed.



Technical Details

The messages the worm sends have randomly chosen Subject: line but the attachment name is fixed ('BINLADEN_BRASIL.EXE').

When the attachment is executed it infects 'hh.exe' (HTML Help executable) and 'explorer.exe' in the windows directory. The worm body is dropped to the Windows directory with a random three character long name. This file is added to 'system.ini':

[boot]
 shell=Explorer.exe XXX.exe


Payload

The worm does not have a destructive payload. After starting sometimes it displays a message.





Technical Details: Gergely Erdelyi; F-Secure Corp.; 24 of October, 2001



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