TR/Spy.ZBot.DFR - Trojan

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Summary

Full description

Statistics

Virus:	TR/Spy.ZBot.DFR
Date discovered:	02/09/2008
Type:	Trojan
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	No
File size:	~83.968 Bytes
IVDF version:	7.00.06.101 - Tue, 02 Sep 2008 08:45 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: Backdoor.Paproxy
   • Mcafee: Spy-Agent.cf trojan
   • Kaspersky: Trojan.Win32.Agent.acbn
   • F-Secure: Trojan-Spy:W32/Zbot.SQ
   • Sophos: Troj/NtRootK-DW
   • Eset: Win32/Spy.Agent.NIQ trojan
   • Bitdefender: Trojan.Spy.ZBot.KW

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

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

The following files are created:

– Temporary files that might be deleted afterwards:
   • %SYSDIR%\sysproc64\sysproc32.sys
   • %SYSDIR%\sysproc64\sysproc32.sys.cla
   • %SYSDIR%\sysproc64\sysproc86.sys

It tries to download a file:

– The location is the following:
   • http://www.goetschhofer.at/**********.exe
It is saved on the local hard drive under: %TEMPDIR%\4.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.RKit.BO

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%\oembios.exe,"

Backdoor Contact server:
The following:
• http://malafikarubik.ru/revolution/rev.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

   If successful, the malware process terminates while the injected part remains active.

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Thomas Wegele on Tue, 02 Sep 2008 12:10 (GMT+1)
Description updated by Thomas Wegele on Tue, 02 Sep 2008 14:44 (GMT+1)

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