TROJ_VBKRYPT.BCG
Trojan.Win32.Generic!BT (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{457C57B8-5A6D-458D-80A2-F6A27914421A}
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Description\
Microsoft\Rpc\UuidTemporaryData
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
MSSQLServer\Client\SuperSocketNetLib\
LastConnect
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}\TypeLib
HKEY_CLASSES_ROOT\CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}\InprocServer32
HKEY_CLASSES_ROOT\BrowserHelper.CBrowserHelper
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Description\
Microsoft\Rpc\UuidTemporaryData
NetworkAddress = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Description\
Microsoft\Rpc\UuidTemporaryData
NetworkAddressLocal = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
MSSQLServer\Client\SuperSocketNetLib\
LastConnect
mixtux.db.7172228.hostedresource.com = "-334876150:tcp:mixtux.db.7172228.hostedresource.com,1433"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}\TypeLib
Version = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
ProgID = "BrowserHelper.CBrowserHelper"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
TypeLib = "{B36032E1-C64C-422F-95CB-347AC027C807}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
VERSION = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
BrowserHelper.CBrowserHelper
Clsid = "{457C57B8-5A6D-458D-80A2-F6A27914421A}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\syscape.dll
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
This report is generated via an automated analysis system.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Close all opened browser windows
Step 3
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 HKEY_LOCAL_MACHINE\Software\Description\Microsoft\Rpc
- UuidTemporaryData
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\Client\SuperSocketNetLib
- LastConnect
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {B36032E1-C64C-422F-95CB-347AC027C807}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B36032E1-C64C-422F-95CB-347AC027C807}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {953DC57F-5A20-467E-9C9E-D9631783CE0B}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
- TypeLib
- In HKEY_CLASSES_ROOT\CLSID
- {457C57B8-5A6D-458D-80A2-F6A27914421A}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
- InprocServer32
- In HKEY_CLASSES_ROOT
- BrowserHelper.CBrowserHelper
Step 4
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\Description\Microsoft\Rpc\UuidTemporaryData
- NetworkAddress = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Description\Microsoft\Rpc\UuidTemporaryData
- NetworkAddressLocal = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\Client\SuperSocketNetLib\LastConnect
- mixtux.db.7172228.hostedresource.com = "-334876150:tcp:mixtux.db.7172228.hostedresource.com,1433"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}\TypeLib
- Version = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
- ProgID = "BrowserHelper.CBrowserHelper"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
- TypeLib = "{B36032E1-C64C-422F-95CB-347AC027C807}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{457C57B8-5A6D-458D-80A2-F6A27914421A}
- VERSION = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\BrowserHelper.CBrowserHelper
- Clsid = "{457C57B8-5A6D-458D-80A2-F6A27914421A}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
- ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{953DC57F-5A20-467E-9C9E-D9631783CE0B}
- ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
Step 5
Search and delete this file
- %User Profile%\Application Data\syscape.dll
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_VBKRYPT.BCG. 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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