TROJ_VB.SMOA
Trojan Horse (Symantec); Trojan.Win32.VB.xtx (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse PSW.Agent.ADHO (AVG)
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.
Other System Modifications
This Trojan modifies the following file(s):
- %System%\drivers\etc\hosts
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It deletes the following files:
- %System%\drivers\etc\hosts
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Licenses
HKEY_CLASSES_ROOT\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\Implemented Categories
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\Implemented Categories\
{7DD95801-9882-11CF-9FA9-00AA006C42C4}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\Implemented Categories\
{7DD95802-9882-11CF-9FA9-00AA006C42C4}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\InProcServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\ProgID
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{R7C0DB872A3F777C0} = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{K7C0DB872A3F777C0} = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\InProcServer32
ThreadingModel = "Both"
HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{I2B9DFF78B0ACBB32} = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{02B9DFF78B0ACBB32} = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"
(Note: The default value data of the said registry entry is 3a98.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\Version
Dropping Routine
This Trojan drops the following files:
- %System Root%\ddaf.exe
- %System Root%\MFC32.dll
- %System Root%\cgdnf1.sys
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
This report is generated via an automated analysis system.
SOLUTION
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
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
- Licenses
- In HKEY_CLASSES_ROOT\CLSID
- {2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}
- Implemented Categories
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\Implemented Categories
- {7DD95801-9882-11CF-9FA9-00AA006C42C4}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\Implemented Categories
- {7DD95802-9882-11CF-9FA9-00AA006C42C4}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}
- InProcServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}
- ProgID
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- CpMRU
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\Licenses
- {R7C0DB872A3F777C0} = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
- {K7C0DB872A3F777C0} = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}\InProcServer32
- ThreadingModel = "Both"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
- {I2B9DFF78B0ACBB32} = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
- {02B9DFF78B0ACBB32} = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Enable = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Size = "a"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- InitHits = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Factor = "14"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- W2KLpk = "1"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
To: TrapPollTimeMilliSecs = ""3a98""
- From: TrapPollTimeMilliSecs = "3a98"
Step 5
Search and delete these components
- %System Root%\ddaf.exe
- %System Root%\MFC32.dll
- %System Root%\cgdnf1.sys
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_VB.SMOA. 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.
Step 7
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\drivers\etc\hosts
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System%\drivers\etc\hosts
Step 9
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2B9DFF78-B0D2-109B-B0D2-109BB0D2109B}
- Version
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