F-Secure Virus Descriptions : Bagle.K
[Summary] | [Disinfection] | [Detailed Description] | [Detection]
| NAME: | Bagle.K |
| ALIAS: | I-Worm.Bagle.j, W32.Beagle.K@mm, W32/Bagle.K@mm |
A new Bagle variant - Bagle.K was found on March 3rd, 2004 and is
spreading in the wild. This variant is very similar to .J variant
and also spreads as an executable file or in a password protected
ZIP archive.
The worm has a new message for the NetSky worm author inside its body:
Hey, NetSky, f*ck off you b*tch!
This indicates an on-going competition/war among virus writers of
the currently widespread malware: Bagle and NetSky. However, this
variant of Bagle doesn't uninstall NetSky worm, it only has a
shorter text message to NetSky author.
F-Secure provides the special disinfection utility to eliminate
Bagle.K worm infection. You can download this utility from our
ftp site:
ftp://ftp.f-secure.com/anti-virus/tools/f-bagle.exe
ftp://ftp.f-secure.com/anti-virus/tools/f-bagle.zip
Disinfection instructions can be found here:
ftp://ftp.f-secure.com/anti-virus/tools/f-bagle.txt
System administrators who are using F-Secure Policy Manager,
can distribute the tool as a JAR package automatically to all
workstations.
System administrators can download the JAR version from:
http://www.europe.f-secure.com/tools/f-bagle.jar
ftp://ftp.europe.f-secure.com/anti-virus/tools/f-bagle.jar
The worm's file is a PE executable about 13 kilobytes in size
packed with UPX file compressor. The unpacked file's size is over
22 kilobytes. The worm adds random garbage to the end of its file
as a decoy.
The worm's lifecycle is about a year. If the date is 25th of
April 2005, the worm uninstalls itself from a system by deleting
its Registry keys and executable file.
The worm has backdoor functionality. When active, the worm
listens on port 2745 for remote commands.
Installation to system
When the worm's file is run, it copies itself as WINSYS.EXE file
to Windows System folder and creates a startup key for this file
in the Registry:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"ssate.exe" = "%winsysdir%\winsys.exe"
where %winsysdir% represents Windows System folder name. The worm
also creates 2 more files in the same foder:
winsys.exeopen
winsys.exeopenopen
These files are copies of the worm's file, but with a different
decoy.
Searching for e-mail addresses
To find victims' e-mail addresses the worm searches all available
hard drives for the files with these extensions:
.wab
.txt
.msg
.htm
.xml
.dbx
.mdx
.eml
.nch
.mmf
.ods
.cfg
.asp
.php
.pl
.adb
.tbb
.sht
.uin
.cgi
The worm avoids spreading to e-mail addresses containing any of
the following:
@hotmail.com
@msn.com
@microsoft
@avp.
noreply
local
root@
postmaster@
Spreading in e-mails
The worm spreads itself in e-mail messages as an executable with
PIF or EXE extension or in a password protected ZIP archive that
contains the worm's executable file with random name and EXE or
PIF extension. The worm randomly selects subjects, message bodies
and attachment names from its internal lists. The worm generates
random passwords that it uses to encrypt its ZIP archive with.
The infected message's From field e-mail address is generated
from a recipient's domain name and the following user name:
management@
administration@
staff@
noreply@
support@
Here are variants of subjects that the worm uses:
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.
Notify about your e-mail account utilization.
E-mail account disabling warning.
The message body is composed from several different parts. The
message begins with the following:
Dear user of <recipient's domain>,
Dear user of <recipient's domain> gateway e-mail server,
Dear user of e-mail server "<recipient's domain>",
Hello user of <recipient's domain> e-mail server,
Dear user of "<recipient's domain>" mailing system,
Dear user, the management of <recipient's domain> mailing system wants to let you know that,
followed by one of the following:
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.
followed by one of the following:
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.
followed by one of the following:
The Management,
Sincerely,
Best wishes,
Have a good day,
Cheers,
Kind regards,
followed by the following:
The <recipient's domain> team
http://www.<recipient's domain>
If the worm spreads in a password-protected ZIP archive, it adds
ZIP password information to its message. It uses one of the
following strings in the message body:
For security reasons attached file is password protected. The password is "<pass>".
For security purposes the attached file is password protected. Password is "<pass>".
Attached file protected with the password for security reasons. Password is <pass>.
In order to read the attach you have to use the following password: <pass>.
where <pass> is a randomly-generated password.
Here are variants of attachment names that the worm uses:
Attach
Information
Readme
Document
Info
TextDocument
TextFile
MoreInfo
Message
As mentioned above, the attachment can have EXE, PIF or ZIP
extension.
Spreading to shared folders
The worm spreads to shared folders on an infected computer. Such
functionality allows the worm to spread through file sharing
clients as well as it can copy itself to their shared folders.
When the worm searches for e-mail addresses on all available hard
disks and it finds a folder which name contains 'shar' substring,
it copies itself to that folder with one of the following names:
Microsoft Office 2003 Crack, Working!.exe
Microsoft Office XP working Crack, Keygen.exe
Microsoft Windows XP, WinXP Crack, working Keygen.exe
Porno Screensaver.scr
Porno, sex, oral, anal cool, awesome!!.exe
Porno pics arhive, xxx.exe
Serials.txt.exe
Windown Longhorn Beta Leak.exe
Windows Sourcecode update.doc.exe
XXX hardcore images.exe
Opera 8 New!.exe
WinAmp 5 Pro Keygen Crack Update.exe
WinAmp 6 New!.exe
Matrix 3 Revolution English Subtitles.exe
Adobe Photoshop 9 full.exe
Ahead Nero 7.exe
ACDSee 9.exe
It should be noted that NetSky worm uses the similar technique,
however it searches all available drives except CD-ROMs.
Killing processes of security software
The worm kills processes of anti-virus and security software that
are associated with these files:
ATUPDATER.EXE
AVWUPD32.EXE
AVPUPD.EXE
LUALL.EXE
DRWEBUPW.EXE
ICSSUPPNT.EXE
ICSUPP95.EXE
UPDATE.EXE
NUPGRADE.EXE
ATUPDATER.EXE
AUPDATE.EXE
AUTODOWN.EXE
AUTOTRACE.EXE
AUTOUPDATE.EXE
AVXQUAR.EXE
CFIAUDIT.EXE
MCUPDATE.EXE
NUPGRADE.EXE
OUTPOST.EXE
AVLTMAIN.EXE
Connecting to websites
The worm periodically connects to the following websites:
http://postertog.de/scr.php
http://www.gfotxt.net/scr.php
http://www.maiklibis.de/scr.php
The worm opens PHP scripts on these pages with certain
parameters. This is done for tracking purposes as the site owner
gets the IP address of an infected computer and the backdoor's
port number and version ID.
At the time of writing this description the above web pages were not
available. However it is recommended users to block access to them.
Another message for NetSky worm author
The worm has a new message for the NetSky worm author inside its
body:
Hey, NetSky, f*ck off you b*tch!
F-Secure Anti-Virus detects Bagle.K worm since the following
update:
[FSAV_Database_Version]
Version=2004-03-03_04
Description:
Katrin Tocheva, March 3rd, 2004;
Technical Details:
Alexey Podrezov, March 3rd, 2004;
Description Updated:
Alexey Podrezov, March 22nd, 2004;
F-Secure Corporation
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