BKDR_GIBON.SMA
Windows 2000, XP, Server 2003
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
Varies
PE
No
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
8.900
7.665.00
01 Dec 2010
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
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}
- 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
- %System%\wininet.exe = %System%\wininet.exe:*:Enabled:Windows XP Update
Step 4
Delete this registry key
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
- winsys
- In HKEY_CLASSES_ROOT\CLSID\{D7FFD784-5276-42D1-887B-00267870A4C7}
- InProcServer32
- 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.
Did this description help? Tell us how we did.