TR/Spy.Goldun.axt - Trojan

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Summary

Full description

Statistics

Virus:	TR/Spy.Goldun.axt
Date discovered:	12/09/2008
Type:	Trojan
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	34.931 Bytes
MD5 checksum:	6ba40E29db8fb6f9145fde7a45708875
IVDF version:	7.00.06.149 - Fri, 12 Sep 2008 08:47 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: Spy-Agent.bg trojan
   • Kaspersky: Trojan-Spy.W32.Goldun.axt
   • F-Secure: Trojan-Spy:W32/Goldun.RR
   • Sophos: Troj/Meredrop-A

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

Side effects:
   • Drops malicious files
   • Lowers security settings
   • Registry modification
   • Steals information

Files The following files are created:

– Non malicious file:
• %SYSDIR%\k86.bin

– %SYSDIR%\cabpck.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.Goldun.axn

– %SYSDIR%\krnlcab.sys Further investigation pointed out that this file is malware, too. Detected as: TR/Rootkit.Gen

It tries to download a file:

– The location is the following:
• http://social-bos.biz/**********/data.php**********

Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\
   krnlcab.sys]
   • @="Driver"

One of the following values is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\
   cabpck]
   • DllName=hex(2):%hex values% (cabpck.dll)
   • Startup="cabpck"
   • mpersonate=dword:00000001
   • Asynchronous=dword:00000001
   • MaxWait=dword:00000001
   • a950="[FA5BF78BD77A4464E]"

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

– [HKLM\SYSTEM\CurrentControlSet\Services\krnlcab]
   • "Type"=dword:00000001
   • "Start"=dword:00000001
   • "ErrorControl"=dword:00000000
   • "ImagePath"=hex(2):%hex values% (system32\krnlcab.sys)
   • "DisplayName"="Cabinet Kernel Packer"

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

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

It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%executed file% "="%executed file% :*:Enabled:rundll32"


The following registry keys are added:

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

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

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

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

See a brief description here.

Description inserted by Alexander Neth on Fri, 12 Sep 2008 07:13 (GMT+1)
Description updated by Alexander Neth on Fri, 12 Sep 2008 07:36 (GMT+1)

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