Virus:TR/Spy.Zbot.nm
Date discovered:24/01/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:No
File size:44.000 Bytes
IVDF version:7.00.02.39 - Thursday, January 24, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Spy.Win32.Zbot.nm
   •  F-Secure: Trojan-Spy.Win32.Zbot.nm
   •  Panda: Trj/Sinowal.ABH
   •  Eset: Win32/Spy.Agent.PZ trojan


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%\wsnpoem\audio.dll
   • %SYSDIR%\wsnpoem\video.dll

 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 ports are opened:

– svchost.exe on a random TCP port in order to provide backdoor capabilities.
– svchost.exe on a random TCP port in order to provide a proxy server.
– svchost.exe on a random TCP port in order to provide a Socks 4 proxy server.


Contact server:
The following:
   • http://77.221.133.188/**********/cfg.bin

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

 Injection – It injects itself into a process.

    Process name:
   • svchost.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 Thomas Wegele on Tuesday, March 4, 2008
Description updated by Thomas Wegele on Tuesday, March 4, 2008

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