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Baba, W32/NetSky.AG@mm, W32/NetSky.AH@mm




W32/Buchon@mm worm was found on October 21st, 2004. This variant is probably a hack made in South Korea.It was originally identified as Netsky, but all major Antivirus vendors realized it has not much to do with that family besides some similarities in the emails it sends. Therefore the new name is Buchon.

Disinfection & Removal

Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

Technical Details

The worm is packed with an unmodified version of UPX, once unpacked it grows to around 60 KiB. This worm contains two hidden strings: "SoonChunHyang" and "Bucheon". There's a University called SoonChunHyang in the city of Bucheon, South Korea.This virus is buggy and fails to replicate properly.Email messages W32/Buchon@mm tries to send can vary a lot. In some cases it sends somewhat personalized messages looking like this:

From: randomaddress@somewhere.com
  To: bob@acme.com
  Subject: Mail Delivery failure - bob@acme.com 
  If the message will not displayed automatically,
  . you cancheck original in attached message.txt
  Attachment: "message.txt      mcafee.com"

W32/Buchon@mm searches local drives for e-mail addresses. Files with following extensions are scanned for e-mail addresses:


The worm also drops a keylogger.


F-Secure AntiVirus detects W32/Buchon@mm with update

Detection Type: PC
Database: 2004-10-21_03

Description Created: Mikko Hypponen, October 21st, 2004
Description Last Modified: Ero Carrera, October 22nd, 2004

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