Virus:TR/Spy.ZBot.DPE
Date discovered:05/08/2008
Type:Trojan
Subtype:Spy
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:59.904 Bytes
MD5 checksum:606ab42e4c906f933bc9c5ab62b798d9
IVDF version:7.00.05.213 - Tuesday, August 5, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  F-Secure: Trojan-PSW:W32/Zbot.FO
   •  Sophos: Troj/Agent-HJG
   •  Eset: Win32/Spy.Agent.NES trojan
   •  Bitdefender: Trojan.Agent.AJLI


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


Side effects:
   • Downloads a malicious file
   • Registry modification
   • Steals information
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\ntos.exe



The following files are created:

– Temporary files that might be deleted afterwards:
   • %SYSDIR%\wnspoem\video.dll
   • %SYSDIR%\wnspoem\audio.dll




It tries to download a file:

– The location is the following:
   • http://dr-mahmoud.com/**********.exe
It is saved on the local hard drive under: %TEMPDIR%\1.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Small.zou

 Registry The following registry key is changed:

– [HKLM\software\microsoft\windows nt\currentversion\winlogon]
   Old value:
   • "userinit"="%SYSDIR%\userinit.exe,"
   New value:
   • "userinit"="%SYSDIR%\userinit.exe,%SYSDIR%\ntos.exe,"

 Email It doesn't have its own spreading routine but it was spammed out via email. The characteristics are described in the following:


From:
The sender address is spoofed.


Subject:
The following:
   • Rechnung N%number%

The body of the email is one of the following:

   • Sehr geehre Damen und Herren,
     Ihr Auftrag Nr. SP7848895 wurde erfullt.
     Ein Betrag von 6536.02 EURO wurde abgebucht und wird in Ihrem Bankauszug als “Paypalabbuchung ” angezeigt.
     Sie finden die Details zu der Rechnung im Anhang
     
     PayPal (Europe)
     S.158; r.l. & Cie, S.C.A.
     50-40 Boulevard Royal
     L-7672 Luxembourg
     
     Hochachtungsvoll,
     Vertretungsberechtigter: Armand Kruse
     Handelsregisternummer: R.C.S. B 285 380
     

   • Sehr geehrte Kunden,
     Ihr Auftrag Nr. SP8742024 wurde erfullt.
     Ein Betrag von 6127.53 EURO wurde abgebucht und wird in Ihrem Bankauszug als "Paypalabbuchung " angezeigt.
     Sie finden die Details zu der Rechnung im Anhang
     
     PayPal (Europe)
     S.392; r.l. & Cie, S.C.A.
     63-88 Boulevard Royal
     L-2082 Luxembourg
     
     Mit freundlichen Grussen,
     Vertretungsberechtigter: Joanna Muller
     Handelsregisternummer: R.C.S. B 922 819
     


Attachment:
The filename of the attachment is:
   • REC719271.zip

The attachment is an archive containing a copy of the malware itself.



The email looks like the following:


 Backdoor The following port is opened:

– svchost.exe on a random TCP port


Contact server:
The following:
   • http://ahleinaks.ru/**********/millionertest.bin

As a result it may send information and remote control could be provided.

 Injection –  It injects the following file into a process: %SYSDIR%\ntos.exe

    Process name:
   • winlogon.exe


 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 a runtime packer.

Description inserted by Alexander Neth on Tuesday, August 5, 2008
Description updated by Philipp Wolf on Tuesday, August 5, 2008

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