This is an Internet worm that spreads as an 8Kb MADCOW.EXE file attached to e-mail
messages. To send infected messages, the worm uses MS Outlook. The worm also
is able to send its copies to IRC channels by infecting an mIRC client.
When the worm is started for the first time (if a user clicks on the EXE attachment
to the message, or accepts an IRC download), the worm copies
itself to two files:
- the Windows system directory with Wininet32.exe name
- the Windows directory with MadCow.exe name
and registeres a MadCow.exe file in the auto-run section:
- in the WIN.INI file, [windows] section, “run=” key – under Win9x
- in the system registry in “Run=” key – under WinNT
The worm then creates a C:WIN32 directory and creates two files here
(DOS batch file and VBS script program):
ENVOIE.BAT – it just spawns an ENVOIE.VBS file (next file)
ENVOIE.VBS – this script spreads the worm with infected messages
While spreading, the script connects to MS Outlook and sends infected e-mail
messages to all addresses in the MS Outlook Address Book. The messages contain the following:
Subject: Pourquoi les vaches sont-elles folles ?
Body: Voila un rapport expliquant la folie des vaches
Upon the next start (next Windows restart), the worm creates its copy with
the MadCow.exe name in the C:WIN32 directory, and then infects an mIRC client in
the following directories:
The infected mIRC client sends a worm copy (MadCow.exe file) to all users
that join the infected channel.
The worm creates the registry key: HKLMSoftware[Atchoum]
If there is no mIRC client found in the system, the worm creates the
MSLS.ICO file in the Windows system directory, writes there an image of imp
(devil) and registers as a standard icon for EXE files.
The worm also contains the following text stings in its body:
IWorm.MadCow par PetiK (c)2000
I Love You Maya / Je t’aime