W32/Buchon@mm

Classification

Malware

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

Summary

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

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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Submit a sample

Submit a file or URL for further analysis.

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.comIf the message will not displayed automatically,
 . you cancheck original in attached message.txt
 www.acme.com/inbox/security/read.asp?sessionid-5339Attachment: "message.txtmcafee.com"

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

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

The worm also drops a keylogger.