Full description

Virus:	Worm/Warezov.Q.1
Date discovered:	11/09/2006
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	151.251 Bytes
MD5 checksum:	abbb2b9923428eb2b396ac70f1b34ad4
VDF version:	6.35.01.209
IVDF version:	6.35.01.213 - Tuesday, September 12, 2006

General Method of propagation:
   • Email

Aliases:
   • Symantec: W32.Stration.A@mm
   • Mcafee: W32/Stration@MM
   • TrendMicro: WORM_STRATION.AZ
   • Sophos: W32/Stration-S
   • VirusBuster: I-Worm.Stration.C
   • Eset: Win32/Stration.AF
   • Bitdefender: Win32.Warezov.Q@mm

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Blocks access to security websites
   • Downloads a malicious file
   • Drops malicious files
   • Uses its own Email engine
   • Steals information

Right after execution the following information is displayed:

Files It copies itself to the following location:
   • %WINDIR%\tsrv.exe

The following files are created:

– A file that contains collected email addresses:
   • %WINDIR%\tsrv.wax

– %WINDIR%\tsrv.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Warezov.Q.1

– %SYSDIR%\hpzl449c14b7.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Warezov.Q.1

– %SYSDIR%\msji449c14b7.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Stration

– %SYSDIR%\cmut449c14b7.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Warezov.Q

It tries to download a file:

– The location is the following:
   • http://yuhadefunjinsa.com/chr/grw/**********
It is saved on the local hard drive under: %TEMPDIR%\~%number%.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • tsrv = %WINDIR%\tsrv.exe s

The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows]
   Old value:
   • AppInit_DLLs =
   New value:
   • AppInit_DLLs = msji449c14b7.dll

Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:

From:
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.

To:
– Email addresses found in specific files on the system.
– Email addresses gathered from WAB (Windows Address Book)

Email design:

From: sec@%recipient's domain%
Subject: Mail server report.
Body:
   • Mail server report.
     Our firewall determined the e-mails containing worm copies are being sent from your computer.
     Nowadays it happens from many computers, because this is a new virus type (Network Worms).
     Using the new bug in the Windows, these viruses infect the computer unnoticeably.
     After the penetrating into the computer the virus harvests all the e-mail addresses and sends the copies of itself to these e-mail addresses
     Please install updates for worm elimination and your computer restoring.
     Best regards,
     Customers support service
Attachment:
   • Update-KB%number%-x86.exe

From: secur@%recipient's domain%
Subject: Mail server report.
Body:
   • Mail server report.
     Our firewall determined the e-mails containing worm copies are being sent from your computer.
     Nowadays it happens from many computers, because this is a new virus type (Network Worms).
     Using the new bug in the Windows, these viruses infect the computer unnoticeably.
     After the penetrating into the computer the virus harvests all the e-mail addresses and sends the copies of itself to these e-mail addresses
     Please install updates for worm elimination and your computer restoring.
     Best regards,
     Customers support service
Attachment:
   • Update-KB%number%-x86.exe

From: serv@%recipient's domain%
Subject: Mail server report.
Body:
   • Mail server report.
     Our firewall determined the e-mails containing worm copies are being sent from your computer.
     Nowadays it happens from many computers, because this is a new virus type (Network Worms).
     Using the new bug in the Windows, these viruses infect the computer unnoticeably.
     After the penetrating into the computer the virus harvests all the e-mail addresses and sends the copies of itself to these e-mail addresses
     Please install updates for worm elimination and your computer restoring.
     Best regards,
     Customers support service
Attachment:
   • Update-KB%number%-x86.exe

Subject:
One of the following:
   • Error
   • Good day
   • hello
   • Mail Delivery System
   • Mail Transaction Failed
   • picture
   • Server Report
   • Status
   • test

Body:
The body of the email is one of the lines:
   • Mail transaction failed. Partial message is available.
   • The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment
   • The message contains Unicode characters and has been sent as a binary attachment

Attachment:
The filename of the attachment is constructed out of the following:

– It starts with one of the following:
   • body
   • data
   • doc
   • docs
   • document
   • file
   • message
   • readme
   • test
   • tex

    Continued by one of the following fake extensions:
   • dat
   • elm
   • log
   • msg
   • txt

    The file extension is one of the following:
   • bat
   • cmd
   • exe
   • pif
   • scr

The attachment is a copy of the malware itself.

The email may look like one of the following:

Mailing Search addresses:
It searches the following file for email addresses:
• %every *.htm file%

Hosts The host file is modified as explained:

– In this case already existing entries remain unmodified.

– Access to the following domains is effectively blocked:
   • download.microsoft.com; go.microsoft.com; msdn.microsoft.com;
      office.microsoft.com; windowsupdate.microsoft.com;
      http://www.microsoft.com/downloads/Search.aspx?displaylang=en; avp.ru;
      www.avp.ru; http://avp.ru; http://www.avp.ru; kaspersky.ru;
      www.kaspersky.ru; http://kaspersky.ru; kaspersky.com;
      www.kaspersky.com; http://kaspersky.com; kaspersky-labs.com;
      www.kaspersky-labs.com; http://kaspersky-labs.com; avp.ru/download/;
      www.avp.ru/download/; http://www.avp.ru/download/;
      http://www.kaspersky.ru/updates/;
      http://www.kaspersky-labs.com/updates/; http://kaspersky.ru/updates/;
      http://kaspersky-labs.com/updates/; downloads1.kaspersky-labs.com;
      downloads2.kaspersky-labs.com; downloads3.kaspersky-labs.com;
      downloads4.kaspersky-labs.com; downloads5.kaspersky-labs.com;
      http://downloads1.kaspersky-labs.com;
      http://downloads2.kaspersky-labs.com;
      http://downloads3.kaspersky-labs.com;
      http://downloads4.kaspersky-labs.com;
      http://downloads5.kaspersky-labs.com;
      downloads1.kaspersky-labs.com/products/;
      downloads2.kaspersky-labs.com/products/;
      downloads3.kaspersky-labs.com/products/;
      downloads4.kaspersky-labs.com/products/;
      downloads5.kaspersky-labs.com/products/;
      http://downloads1.kaspersky-labs.com/products/;
      http://downloads2.kaspersky-labs.com/products/;
      http://downloads3.kaspersky-labs.com/products/;
      http://downloads4.kaspersky-labs.com/products/;
      http://downloads5.kaspersky-labs.com/products/;
      downloads1.kaspersky-labs.com/updates/;
      downloads2.kaspersky-labs.com/updates/;
      downloads3.kaspersky-labs.com/updates/;
      downloads4.kaspersky-labs.com/updates/;
      downloads5.kaspersky-labs.com/updates/;
      http://downloads1.kaspersky-labs.com/updates/;
      http://downloads2.kaspersky-labs.com/updates/;
      http://downloads3.kaspersky-labs.com/updates/;
      http://downloads4.kaspersky-labs.com/updates/;
      http://downloads5.kaspersky-labs.com/updates/;
      ftp://downloads1.kaspersky-labs.com;
      ftp://downloads2.kaspersky-labs.com;
      ftp://downloads3.kaspersky-labs.com;
      ftp://downloads4.kaspersky-labs.com;
      ftp://downloads5.kaspersky-labs.com;
      ftp://downloads1.kaspersky-labs.com/products/;
      ftp://downloads2.kaspersky-labs.com/products/;
      ftp://downloads3.kaspersky-labs.com/products/;
      ftp://downloads4.kaspersky-labs.com/products/;
      ftp://downloads5.kaspersky-labs.com/products/;
      ftp://downloads1.kaspersky-labs.com/updates/;
      ftp://downloads2.kaspersky-labs.com/updates/;
      ftp://downloads3.kaspersky-labs.com/updates/;
      ftp://downloads4.kaspersky-labs.com/updates/;
      ftp://downloads5.kaspersky-labs.com/updates/;
      http://updates.kaspersky-labs.com/updates/;
      http://updates1.kaspersky-labs.com/updates/;
      http://updates2.kaspersky-labs.com/updates/;
      http://updates3.kaspersky-labs.com/updates/;
      http://updates4.kaspersky-labs.com/updates/;
      ftp://updates.kaspersky-labs.com/updates/;
      ftp://updates1.kaspersky-labs.com/updates/;
      ftp://updates2.kaspersky-labs.com/updates/;
      ftp://updates3.kaspersky-labs.com/updates/;
      ftp://updates4.kaspersky-labs.com/updates/; viruslist.com;
      www.viruslist.com; http://viruslist.com; viruslist.ru;
      www.viruslist.ru; http://viruslist.ru;
      ftp://ftp.kasperskylab.ru/updates/; symantec.com; www.symantec.com;
      http://symantec.com; customer.symantec.com;
      http://customer.symantec.com; liveupdate.symantec.com;
      http://liveupdate.symantec.com; liveupdate.symantecliveupdate.com;
      http://liveupdate.symantecliveupdate.com;
      securityresponse.symantec.com; http://securityresponse.symantec.com;
      service1.symantec.com; http://service1.symantec.com;
      symantec.com/updates; http://symantec.com/updates;
      updates.symantec.com; http://updates.symantec.com; eset.com/;
      www.eset.com/; http://www.eset.com/; eset.com/products/index.php;
      www.eset.com/products/index.php;
      http://www.eset.com/products/index.php; eset.com/download/index.php;
      www.eset.com/download/index.php;
      http://www.eset.com/download/index.php; eset.com/joomla/;
      www.eset.com/joomla/; http://www.eset.com/joomla/; u3.eset.com/;
      http://u3.eset.com/; u4.eset.com/; http://u4.eset.com/;
      www.symantec.com/updates

The modified host file will look like this:

Backdoor Contact server:
The following:
   • http://yuhadefunjinsa.com/cgi-bin/**********

As a result it may send some information. This is done via the HTTP POST method using a CGI script.

Sends information about:
    • Collected Email addresses
    • Current malware status

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Gherman on vrijdag 15 september 2006
Description updated by Andrei Gherman on maandag 18 september 2006

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