BKDR_GIBON.SMA

October 15, 2013
 Analysis by: jont
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This backdoor bypasses the Windows firewall. This allows the malware to perform its intended routine without being detected by an installed firewall.

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

05 Feb 2010

Installation

This backdoor drops the following files:

  • %System%\wininet.exe - copy of itself
  • %System%\svshost.dll - detected as TROJ_GIBON.X
  • %System%\winint.exe - detected as TROJ_GIBON.D

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This backdoor adds the following registry entries as part of its installation routine:

HKEY_CLASSES_ROOT\CLSID\{D7FFD784-5276-42D1-887B-00267870A4C7}\
InProcServer32
(Default) = "%System%\svshost.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\ShellServiceObjectDelayLoad
SysRun = "{D7FFD784-5276-42D1-887B-00267870A4C7}"

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\MPRServices\winsys
DLLName = "%System%\svshost.dll"

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\MPRServices\winsys
EntryPoint = "w"

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\MPRServices\winsys
StackSize = 0

It modifies the following registry entries to disable the Windows Firewall settings:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\wininet.exe = "%System%\wininet.exe:*:Enabled:Windows XP Update"

Dropping Routine

This backdoor executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.665.00

VSAPI PATTERN Date:

01 Dec 2010

VSAPI PATTERN Date:

12/1/2010 12:00:00 AM

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file dropped/downloaded by BKDR_GIBON.SMA

    • TROJ_GIBON.X
    • TROJ_GIBON.D

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad
    • SysRun = {D7FFD784-5276-42D1-887B-00267870A4C7}
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\wininet.exe = %System%\wininet.exe:*:Enabled:Windows XP Update

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKLM\System\CurrentControlSet\Control\MPRServices\
    • winsys
  • In HKEY_CLASSES_ROOT\CLSID\{D7FFD784-5276-42D1-887B-00267870A4C7}
    • InProcServer32

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_GIBON.SMA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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