W32/Bagle-K 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 extensions WAB, TXT, HTM, XML, DBX, MDX, EML, NCH, MMF, ODS, CFG, ASP, PHP, PL, ADB, TBB and SHT.
When run the worm opens copies itself to the Windows system folder as winsys.exe.
W32/Bagle-K adds the value ssate.exe = <SYSTEM>\winsys.exe to the registry entry HKCU\Software\Microsoft\Windows\CurrentVersion\Run.
This means that W32/Bagle-K runs every time you logon to your computer.
Emails have the following characteristics:
Sender: One of -
management@<recipient_internet_domain>
administration@<recipient_internet_domain>
staff@<recipient_internet_domain>
noreply@<recipient_internet_domain>
support@<recipient_internet_domain>
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.
Notify about your e-mail account utilization.
E-mail account disabling warning.
Message text: Randomly combined by taking one string from each of the following paragraphs:
Dear user of <recipient_internet_domain>
Dear user of <recipient_internet_domain> e-mail server gateway,
Dear user of e-mail server <recipient_internet_domain>",
Hello user of <recipient_internet_domain> e-mail server,
Dear user of <recipient_internet_domain>" mailing system,
Dear user, the management of <recipient_internet_domain> mailing system wants to let you know that,
and
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.
and
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.
and
For security reasons attached file is password protected. The password is "<randomly_generated_numeric_pasword>".
For security purposes the attached file is password protected. Password is "<randomly_generated_numeric_pasword>".
Attached file is protected with the password for security reasons. Password is "<randomly_generated_numeric_pasword>.
In order to read the attach you have to use the following password: "<randomly_generated_numeric_pasword>.
and
The Management,
Sincerely,
Best wishes,
Have a good day,
Cheers,
Kind regards,
and
The <recipient_internet_domain> team http://www.<recipient_internet_domain>
Attached file: a randomly named ZIP archive. The name is chosen from:
Attach
Information
Readme
Document
Info
TextDocument
Text
MoreInfo
Message
As an example, here is how the worm could appear if your company's domain name was XYZCORP.COM:
An example of the kind of email which can be sent by the Bagle-K worm
W32/Bagle-K opens up a backdoor on port 2745 and listens for connections. If it receives the appropriate command it attempts to download and execute a file. W32/Bagle-K also makes a web connection to a remote URL, thus reporting the location and open port of infected computers.
W32/Bagle-K attempts to terminate several anti-virus and security-related processes:
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
W32/Bagle-K searches the mapped drives for the folders containing the string "shar" in the folder name. If such folder is found, the worm copies itself to the folder using the following 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
XX hardcore images.exe
If the date is after 25 April 2005, W32/Bagle-K terminates itself and deletes all the registry entries it created.
W32/Bagle-K contains the following text hidden inside its code, which is not displayed:
Hey, NetSky, fuck off you bitch!