Virus:TR/Spy.ZBot.DPF
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:58.368 Bytes
MD5 checksum:eead764389f7e2b1939d147b198443a3
IVDF version:7.00.05.216 - Tuesday, August 5, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: Trojan.Wsnpoem
   •  Mcafee: Spy-Agent.bw trojan
   •  Kaspersky: Trojan-Spy.Win32.Zbot.dri
   •  TrendMicro: TSPY_ZBOT.RK
   •  F-Secure: Trojan-Spy.Win32.Zbot.dri
   •  Sophos: Troj/Agent-HJN
   •  Eset: a variant of Win32/Spy.Agent.NES trojan


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/**********x.exe
It is saved on the local hard drive under: %TEMPDIR%\5.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,"

 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 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 Tuesday, August 5, 2008
Description updated by Philipp Wolf on Wednesday, August 6, 2008

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