F-Secure Virus Descriptions : Matcher
Matcher is an e-mail worm written in Visual Basic. It was first
discovered on April 18th, 2001. The worm's file is a PE
executable about 29kb long. The worm file is not encrypted or
packed. To be run the worm requires MSVBVM60.DLL library to be
present in a system.
When the worm's file is run, it installs itself to system by
copying itself as MATCHER.EXE to \Windows\System\ folder and
modifying a startup key in the Registry to be always run with
Windows. The worm then connects to Outlook, reads e-mail
addresses from Address Book and sends itself as MATCHER.EXE to
all these addresses. In some cases the worm repeats sending
itself every 1 minute. As a result mail servers might be
overloaded with worm's messages.
The infected message sent by the worm looks like that:
Subject: Matcher
Body: Want to find your love mates!!! Try this its cool... Looks and Attitude
Maching to opposite sex.
Attachment: Matcher.exe
After that the worm adds a few commands to AUTOEXEC.BAT file that
will output a message 'from: Bugger' and pause a system on next
startup.
The worm doesn't hide itself and doesn't delete its copies from
Sent folder.
To disinfect a system manually, the worm's file MATCHER.EXE
should be deleted from \Windows\System\ folder. It is recommended
to delete the file from pure DOS as it is locked while Windows is
active. You can also use a DOS-based scanner to disinfect your
system from pure DOS.
[Analysis: Alexey Podrezov, Katrin Tocheva; F-Secure Corp.; April 18th, 2001]
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