Troj/Agent-GVB is a Trojan for the Windows platform.

When Troj/Agent-GVB is installed the following files are created:

Current Folder\sbmdl.dll
Current Folder\sbsm.exe

Both are detected as Troj/Agent-GVB.

The following registry entry is created to run Troj/Agent-GVB on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\explorer\run start
pathname of the Trojan executable

The file sbmdl.dll is registered as a COM object and Browser Helper Object (BHO) for Microsoft Internet Explorer, creating registry entries under:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{7C109800-A5D5-438F-9640-18D17E168B88}

Troj/Agent-GVB changes search settings for Microsoft Internet Explorer by modifying values under:

HKCU\Software\Microsoft\Internet Explorer\Search\
HKCU\Software\Microsoft\Internet Explorer\SearchScopes\
HKCU\Software\Microsoft\Internet Explorer\SearchScopes\{DAED9266-8C28-4C1C-8B58-5C66EFF1D302}

More information can be found at this Sophos page.