W32/Bagle-O

Please follow the instructions for removing worms.

Sophos Anti-Virus can disinfect files containing a parasitic infection of W32/Bagle-O, detected by Sophos Anti-Virus as W32/Bagle-N. Parasitic infections are those in which the virus adds itself into an existing file. The winupd.exe file cannot be disinfected as the entire file is created by W32/Bagle-O. This means there is no original file to restore, and that the file can simply be deleted.

W32/Bagle-O is an email worm which sends itself via its own SMTP engine to addresses harvested from your hard disk. The worm searches for files with the following extensions:

WAB, TXT, MSG, HTM, SHTM, STM, XML, DBX, MBX, MDX, EML, NCH, MMF, ODS, CFG, ASP, PHP, PL, ADB, TBB, SHT, XLS, OFT, UIN, CGI, MHT, DHTM, JSP.

When run the worm copies itself to the Windows system folder using the name winupd.exe.

Note that W32/Bagle-O is also a parasitic virus which infects EXE files already
present on your hard disk (infected files are detected as W32/Bagle-N). If you run an infected program the worm file will reappear, just as if you had opened an infected email attachment. Be sure to replace or to disinfect files infected in this way to prevent winupd.exe from reappearing. (See the Recovery section below.)

W32/Bagle-O adds the value:

winupd.exe = <SYSTEM>\winupd.exe

to the registry entry:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run

This means that W32/Bagle-O runs every time you logon to your computer.

W32/Bagle-O avoids email addresses containing the following:

sopho, @hotmail.com, @msn, @microsoft, anyone@, bugs@, contract@, feste,
gold-certs@, help@, info@, nobody@, noone@, rating@, kasp, admin, icrosoft,
support, ntivi, unix, bsd, linux, listserv, certific, samples, @foo, @iana, free-av, @messagelab, winzip, google, winrar, abuse, panda, cafee, spam, pgp, @avp., noreply, local, root@, postmaster@, f-secur

Emails have the following characteristics:

Subject lines:

E-mail account security warning.
Notify about using the e-mail account.
Warning about your e-mail account.
Important notify about your e-mail account.
Email account utilization warning.
E-mail technical support message.
E-mail technical support warning.
Email report
Important notify
Account notify
E-mail warning
Notify from e-mail technical support.
Notify about your e-mail account utilization.
E-mail account disabling warning.
Re: Msg reply
Re: Hello
Re: Yahoo!
Re: Thank you!
Re: Thanks :)
RE: Text message
Re: Document
Incoming message
Re: Incoming Message
Re: Incoming Fax
Hidden message
Fax Message Received
Protected message
RE: Protected message
Forum notify
Request response
Site changes
Re: Hi
Encrypted document

Message texts (contructed from the following):

Dear user of <recipient_domain_name>,
Dear user of <recipient_domain_name> e-mail server gateway,
Dear user of "<recipient_domain_name>" mailing server,
Dear user of "<recipient_domain_name>" mailing domain,
Dear user of "<recipient_domain_name>" domain,
Dear user of e-mail server "<recipient_domain_name>",
Hello user of <recipient_domain_name> e-mail server,
Dear user of "<recipient_domain_name>" mailing system,
Dear user, the management of <recipient_domain_name> mailing system wants to let you know that,

Your e-mail account has been temporary disabled because of unauthorized access.

Our main mailing server will be temporary unavaible for next two days, to continue receiving mail in these days you have to configure our free auto-forwarding service.

Your e-mail account will be disabled because of improper using in next three days, if you are still wishing to use it, please, resign your account information.

We warn you about some attacks on your e-mail account. Your computer may contain viruses, in order to keep your computer and e-mail account safe, please, follow the instructions.

Our antivirus software has detected a large ammount of viruses outgoing from your email account, you may use our free anti-virus tool to clean up your computer software.

Some of our clients complained about the spam (negative e-mail content) outgoing from your e-mail account. Probably, you have been infected by a proxy-relay trojan server. In order to keep your computer safe, follow the instructions.

Read the attach.
Your file is attached.
More info in attach
See attach.
Follow the wabbit.
Find the white rabbit.
Please, have a look at the attached file.
See the attached file for details.
Message is in attach
Here is the file.

For more information see the attached file.
Further details can be obtained from attached file.
Advanced details can be found in attached file.
For details see the attach.
For details see the attached file.
For further details see the attach.
Please, read the attach for further details.
Pay attention on attached file.

The <recipient_domain_name> team

The Management,
Sincerely,
Best wishes,
Yours,
Have a good day,
Cheers,
Kind regards,

For security reasons attached file is password protected. The password is
<img src="cid:<imagefile>">
For security purposes the attached file is password protected. Password --
<img src="cid:<imagefile>">
Note: Use password <img src="cid:<imagefile>"> to open archive.
Attached file is protected with the password for security reasons. Password is
<img src="cid:<imagefile>">
In order to read the attach you have to use the following password:
<img src="cid:<imagefile>">
Archive password: <img src="cid:<imagefile>">
Password - <img src="cid:<imagefile>">
Password: <img src="cid:<imagefile>">

Note, the email may have image files with extensions BMP, GIF or JPEG which
contain a password.

Attached filenames:

Attach
Information
Details
Encrypted
first_part
Readme
Document
Info
TextDocument
Text
details
text_document
pub_document
MoreInfo
Message

Note, the attached file arrives either as programs (with an EXE or a PIF extension) or as password-protected archives (with a ZIP or RAR extension). The password is included in the email.

A typical email sent by W32/Bagle-O

W32/Bagle-O opens port 2556 and listens for remote commands. If it receives the appropriate command it attempts to download and execute a file. W32/Bagle-O also makes a web connection to a remote URL, thus reporting the location and open port of infected computers.

W32/Bagle-O attempts to terminate a wide range of anti-virus and security related processes.

W32/Bagle-O searches the mapped drives for the folders containing the string
"shar" in the folder name. The worm copies itself to these folders using the names:

ACDSee 9.exe
Adobe Photoshop 9 full.exe
Ahead Nero 7.exe
Matrix 3 Revolution English Subtitles.exe
Microsoft Office 2003 Crack, Working!.exe
Microsoft Office XP working Crack, Keygen.exe
Microsoft Windows XP, WinXP Crack, working Keygen.exe
Opera 8 New!.exe
Porno Screensaver.scr
Porno pics arhive, xxx.exe
Porno, sex, oral, anal cool, awesome!!.exe
Serials.txt.exe
WinAmp 5 Pro Keygen Crack Update.exe
WinAmp 6 New!.exe
Windown Longhorn Beta Leak.exe
Windows Sourcecode update.doc.exe
XXX hardcore images.exe

If run after 31 December 2005 the worm deletes the registry entries it created when first run.

Curiously, the author of the worm has hidden an ASCII text representation of a butterfly inside the virus code, alongside the words:

The White Rabbit Presents
The first and the single
Anti-NetSky AntiVirus

Hidden inside the Bagle-O worm is a picture of a butterfly