Classification

Category: Malware

Type: Worm

Aliases: Matcher, I-Worm_Matcher, I-Worm.Matcher

Summary


Matcher is an email 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.

Removal


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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Technical Details


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 email 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.