Virus:TR/Spy.ZBot.dbi
Date discovered:09/07/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:56.832 Bytes
MD5 checksum:5a1434342ac892e7fc3c004977de6fd3
IVDF version:7.00.05.71 - Wednesday, July 9, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Spy.Win32.Zbot.dbi
   •  F-Secure: Trojan-Downloader:W32/Zlob.HSY
   •  Sophos: Troj/Agent-HEY
   •  Eset: Win32/Spy.Agent.PZ trojan
   •  Bitdefender: Trojan.Spy.Zbot.GF


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


Side effects:
   • 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\audio.dll
   • %SYSDIR%\wnspoem\video.dll

 Registry The following registry keys are changed:

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

– [HKLM\software\microsoft\Windows nt\currentversion\network]
   New value:
   • "UID"="%computer name%_%hex values%"

 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:
   • Ihr UPS Paket %random character string%



Body:
The body of the email is the following:

   • Guten Tag,
     leider konnten wir ihren Paket gesendet am 01. Juli nicht zustellen, da
     die Adresse des Empfangers nicht existiert. Drucken Sie bitte den Lieferschein im Anhang dieser Mail aus,
     und holen Sie ihr Paket bei uns ab.
     Mit freundlichen Grussen,
     Ihre UPS


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

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

 Backdoor The following port is opened:

– svchost.exe on a random TCP port


Contact server:
The following:
   • http://fixbserver.ru/**********AhsAAs.bin

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

 Injection – It injects itself into a process.

    Process name:
   • winlogon.exe


 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 Thomas Wegele on Wednesday, July 9, 2008
Description updated by Thomas Wegele on Wednesday, July 9, 2008

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