TR/FURootkit - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/FURootkit
Date discovered:	14/03/2006
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	19.533 Bytes
MD5 checksum:	dbd59aa4151a57c8e0124c34f9a3aef7
VDF version:	6.30.00.74

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: Hacktool.Rootkit
   • Kaspersky: Net-Worm.Win32.Mytob.r
   • TrendMicro: TROJ_ROOTDROP.A
   • Bitdefender: Trojan.Dropper.Rootkit.H

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

Side effects:
   • Drops a malicious file
   • Registry modification

Files The following file is created:

– %malware execution directory%\msdirectx.sys Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.Agent.dg.2.B

Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\msdirectx\Security]
   • "Security"=hex:%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_MSDIRECTX]
   • "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\msdirectx]
   • "Type"=dword:00000001
     "Start"=dword:00000003
     "ErrorControl"=dword:00000001
     "ImagePath"=hex(2):%malware executin directory%\msdirectx.sys
     "DisplayName"="msdirectx"

– [HKLM\SYSTEM\CurrentControlSet\Services\msdirectx\Enum]
   • "0"="Root\\LEGACY_MSDIRECTX\\0000"
     "Count"=dword:00000001
     "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_MSDIRECTX\0000]
   • "Service"="msdirectx"
     "Legacy"=dword:00000001
     "ConfigFlags"=dword:00000000
     "Class"="LegacyDriver"
     "ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}"
     "DeviceDesc"="msdirectx"

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_MSDIRECTX\0000\
   Control]
   • "*NewlyCreated*"=dword:00000000
     "ActiveService"="msdirectx"

Rootkit Technology It is a malware-specific technology. The malware hides its presence from system utilities, security applications and in the end, from the user.

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 the following runtime packer:
• FSG

See a brief description here.

Description inserted by Iulia Diaconescu on Wed, 15 Mar 2006 09:26 (GMT+1)
Description updated by Andrei Gherman on Fri, 17 Mar 2006 11:12 (GMT+1)

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