Worm/Warezov.DLL.C - Worm

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Virus:	Worm/Warezov.DLL.C
Date discovered:	22/09/2006
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Low to medium
Static file:	Yes
File size:	153.128 Bytes
MD5 checksum:	6d5b6945f50dc801208525936d5c24b9
VDF version:	6.36.00.50 - Fri, 22 Sep 2006 09:32 (GMT+1)
IVDF version:	6.36.00.61 - Tue, 26 Sep 2006 14:30 (GMT+1)

General Method of propagation:
   • Email

Aliases:
   • Mcafee: W32/Stration@MM
   • Kaspersky: Email-Worm.Win32.Warezov.ab
   • TrendMicro: WORM_STRATION.BC
   • F-Secure: Email-Worm.Win32.Warezov.ab
   • Eset: Win32/Stration.AR

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

Side effects:
   • Blocks access to security websites
   • Drops malicious files
   • Uses its own Email engine
   • Lowers security settings
   • Registry modification

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

– %home%\Desktop\%two-digit random character string%.tmp This is a non malicious text file with the following content:
   • %random character string%

– %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.AB

– %SYSDIR%\hpzl449c14b7.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Warezov.AB.2

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

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:
The sender address is spoofed.
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)
– Generated addresses

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 following:

   • 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 filenames of the attachments is constructed out of the following:

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

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

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

The attachment is a copy of the malware itself.

The email may look like one of the following:

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:

Injection – It injects the following file into a process: tsrv.dll

Process name:
• %all running processes%

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• MEW

See a brief description here.

Description inserted by Adriana Popa on Tue, 26 Sep 2006 11:29 (GMT+1)
Description updated by Adriana Popa on Tue, 26 Sep 2006 13:26 (GMT+1)

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