Threat Description



Category: Malware
Platform: W32
Aliases: W32/Buchon@mm, 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.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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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:   To:   Subject: Mail Delivery failure -      If the message will not displayed automatically,   . you cancheck original in attached message.txt      Attachment: "message.txt"    

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

.dbx  .wab  .mbx  .eml  .mdb  .tbb   

The worm also drops a keylogger.


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

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

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


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