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Alias:I-Worm.Bagz.b, W32/Bagz-B, W32/Bagz.B.worm
Type:Worm 
Size:163,844 Bytes 
Origin: 
Date:10-04-2004 
Damage:Sent by email; downloads files; deactivates local firewall. 
VDF Version:6.27.0.85 
Danger:Low 
Distribution:Medium 

General DescriptionAffected operating systems:
Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, Windows Server 2003

DistributionWorm/Bagz.B sends itself or a .ZIP archive to email addresses it can find on the infected system. It searches for emailaddresses into files of type:
.txt
.tbi
.tbb
.htm
.dbx

The infectious email can have various contents. The worm uses random textlines for the subject, email body and attachment name.

Subject:
Fwd: Password
when should i call you?
You have recieved an eCard!
What is this ????
Deactivation Notice
My funny stories
Cost Inquiry
Re: payment
WinXP
troubles are back again
Questions
Order Approval
units available
progress news
big announcements
Message recieved, please confirm
Re: User ID Update
Fwd: Your Funds are Eligible for Withdrawal
find a solution with this customer
No Subject
Re: Help Desk Registration
failure notice
referrences
RE: Re: A question
Knowledge Base Article
Open Invoices
Returned mail: see transcript for details
building maintenance
[Fwd: Broken link]
Need help pls
Webmail Invite
RE: quote request

Attachment:
doc.zip
documents.zip
atach.zip
file.zip
read.zip
readme.zip
contact.zip
mail.zip
att.zip
warning.zip
db.zip
msg.zip
message.zip
messages.zip
archive.zip
arch.zip
support.zip
account.zip
Ctutorial.doc<%blanks%>.exe
doc.doc<%blanks%>.exe
documents.doc<%blanks%>.exe
atach.doc<%blanks%>.exe
file.doc<%blanks%>.exe
read.doc<%blanks%>.exe
readme.doc<%blanks%>.exe
contact.doc<%blanks%>.exe
mail.doc<%blanks%>.exe
att.doc<%blanks%>.exe
warning.doc<%blanks%>.exe
db.doc<%blanks%>.exe
msg.doc<%blanks%>.exe
message.doc<%blanks%>.exe
messages.doc<%blanks%>.exe
archive.doc<%blanks%>.exe
arch.doc<%blanks%>.exe
support.doc<%blanks%>.exe
account.doc<%blanks%>.exe

And for the email body, Worm/Bagz.B uses one of the texts below:

Hello,
Your email was sent in an INVALID format.
To verify this email was sent from you,
simply open the attached email (.eml) file
and click yes in the sender options box.
Thank You,
User

Hello,
What version of windows you are using?
This last document I received from you came out weird.
Please see the attached word file and resend the file to me.
Many thanks,
User

Hello,
I was in a hurry and I forgot to attach an important
document. Please see attached.
Best Regards,
User

Hello,
Sorry, I forgot to attach the new contact information.
Please view the attached (.pdf) contact sheet.
Sincerely,
User

***YOUR MESSAGE HAS BEEN RECOGNIZED AS SPAM***
Hello,
The previous email you sent has been recognized as spam.
This means your email was not delivered to your friend or client.
You must open the attached file to receive more information.
***YOUR MESSAGE HAS BEEN RECOGNIZED AS SPAM***

***URGENT: SERVICE SHUTDOWN NOTICE***
Due to your failure to comply with our email
Rules and Regulations, your email account has been
temporarily suspended for 24 hours unless we are contacted regarding
this situation.
You must read the attached document for further
instructions. Failure to comply will result in termination of your account.
Regards,
Net Operator
***URGENT: SERVICE SHUTDOWN NOTICE***

Hello,
Your email was received.
YOUR REPLY IS URGENT!
Please view the attached text file for instructions.
Regards,
User

Hello,
My PC crashed while I was sending that last email.
I have re-attached the document of yours that I discovered.
Please read attached document and respond ASAP.
Sincerely,
User

***ATTENTION: YOUR EMAIL IS NOT BEING DELIVERED!***
You are currently unable to send emails.
This may be a billing issue.
Please call the billing center.
The for the billing office is located in the attached
contact list for your convenience.
***ATTENTION: YOUR EMAIL IS NOT BEING DELIVERED!***

Hello,
I resent this email as attachment because
it was previously blocked by your email filters.
Please read the attachment and respond.
Thanks,
User

Technical DetailsWorm/Bagz.B is a massmailer that uses its own SMTP engine to send itself to emailaddresses it can find on the infected system.

When activated, the worm makes the registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
"syslogin.exe" = "syslogin.exe"

It creates the files:
\%SystemDIR%\syslogin.exe
\%SystemDIR%\tutorial.zip
\%SystemDIR%\dl.exe

and it also makes a copy of itself in System or System32 directory:
\%SystemDIR%\tutorial.doc<%blanks%> .exe

After creating its files, the worm deactivates the Windows firewall, using the command:
"netsh firewall ipv4 set opmode | mode=disable"

Then the worm can download and run files. It creates its own network drive, to handle the firewall:
\%SystemDIR%\drivers\ndisrd.sys
\%SystemDIR%\ndisapi.dll
\%SystemDIR%\ndisrd.sys

The worm searches then for emailaddresses on the system, as well as for the IP address of the infected computer and for the email gateway, and saves them into the following temporary files:
\%SystemDIR%\ipdb.dll
\%SystemDIR%\jobdb.dll
\%SystemDIR%\wdate.dll
Description insérée par Crony Walker le mardi 15 juin 2004

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