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  4. Trojan-Spy:W32/Goldun.RR

Trojan-Spy:W32/Goldun.RR

Name : Trojan-Spy:W32/Goldun.RR
Detection Names : Trojan-Spy.Win32.Goldun.axt
Trojan-Spy:W32/Goldun.RR
Aliases : Trojan.Goldun (Symantec)
TROJ_MEREDROP.GJ (Trend Micro)
Trojan:Win32/Agent.PX (Microsoft)
Category:Malware
Type:Trojan-Spy
Platform:W32

Summary

A trojan that secretly installs spy programs, such as keyloggers.

Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

Additional Details

Trojan-Spy:W32/Goldun.RR will install two other malicious programs on the machine before terminating itself; subsequently, the malwares will communicate with a remote site without the user's knowledge or consent.

Unlike most malware, Goldun.RR will make registry changes that allow it to run even in Safe Boot Mode.



Installation

During installation, Goldun.RR drops the following files:

  •  C:\WINDOWS\system32\cabpck.dll  - detected as Trojan-Spy.Win32.Goldun.axn.
  •  C:\WINDOWS\system32\krnlcab.sys   - detected as Trojan-Spy.Win32.Goldun.axr.

The main file create this process and terminate itself:

  •  C:\WINDOWS\system32\rundll32.exe cabpck.dll,cabpck


Activity

Once installed, Goldun.RR attempts to connect to:

  •  social-bos.biz/jerken/data.php?trackid=706[...]


Registry Changes

It creates a launch point using winlogon event:

  •  HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\cabpck
      DllName = cabpck.dll
      Startup = cabpck
      Impersonate = 00000001
      Asynchronous = 00000001
      MaxWait = 00000001
      a950 = [2E09BF121A42171A6]

Goldun.RR registers itself as a service:

  •  HKLM\System\CurrentControlSet\Services\krnlcab
      Type = 00000001
      Start = 00000001
      ErrorControl = 00000000
      ImagePath = system32\krnlcab.sys
      DisplayName = Cabinet Kernel Packer
  •  HKLM\System\CurrentControlSet\Services\krnlcab\Security
      Security = \x01\x00\x14\x80\x90\x00\x00\x00\x9C\x00\x00\[...]

Creates this entry so that it will load during safe boot mode:

  •  HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\krnlcab.sys
      (default) = Driver

Adds its connection to the Windows firewall list so as by-pass it:

  •  HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
      \AuthorizedApplications\List\
      C:\WINDOWS\system32\rundll32.exe =
      C:\WINDOWS\system32\rundll32.exe:*:Enabled:rundll32