TROJ_VB.JBT
TrojanDownloader:Win32/Nubjub.A (Microsoft); [2.nsis]:Generic Downloader.x!cqw (McAfee); Trojan Horse (Symantec); ARC:NSIS, [data0002]:Trojan-Downloader.Win32.VB.qcd, [data0002]:Trojan-Downloader.Win32.VB.qcd (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Gen:Trojan.Heur.GZ.eq0@bKHAAani (FSecure)
Windows 2000, Windows, XP, Windows Server 2003
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
94,405 bytes
EXE
No
23 Nov 2011
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.
Installation
This Trojan creates the following folders:
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsp3.tmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsv1.tmp
- %User Temp%\nsp3.tmp
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
It deletes the following folders:
- %User Temp%\nsp3.tmp\
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\InprocServer32
HKEY_CLASSES_ROOT\InetCtls.Inet
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
InetCtls.Inet\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
InetCtls.Inet\CurVer
HKEY_CLASSES_ROOT\InetCtls.Inet.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
InetCtls.Inet.1\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\Version
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\Control
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\MiscStatus
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\MiscStatus\
1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\ToolboxBitmap32
HKEY_CLASSES_ROOT\CLSID\{48E59294-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59294-9880-11CF-9754-00AA00C00908}\InprocServer32
HKEY_CLASSES_ROOT\CLSID\{48E59295-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59295-9880-11CF-9754-00AA00C00908}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59291-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59291-9880-11CF-9754-00AA00C00908}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59291-9880-11CF-9754-00AA00C00908}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59291-9880-11CF-9754-00AA00C00908}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59292-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59292-9880-11CF-9754-00AA00C00908}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59292-9880-11CF-9754-00AA00C00908}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59292-9880-11CF-9754-00AA00C00908}\TypeLib
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59291-9880-11CF-9754-00AA00C00908}\TypeLib
Version = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59292-9880-11CF-9754-00AA00C00908}\TypeLib
Version = "1.0"
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59294-9880-11CF-9754-00AA00C00908}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59295-9880-11CF-9754-00AA00C00908}
Dropping Routine
This Trojan drops the following files:
- %User Temp%\nsa2.tmp
- %User Temp%\nsp3.tmp\data116.exe
- %System%\MSINET.OCX
- %User Startup%\santa.bat
- %System%\data116.txt
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
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_CLASSES_ROOT\CLSID
- {48E59293-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- InprocServer32
- In HKEY_CLASSES_ROOT
- InetCtls.Inet
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InetCtls.Inet
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InetCtls.Inet
- CurVer
- In HKEY_CLASSES_ROOT
- InetCtls.Inet.1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InetCtls.Inet.1
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- Version
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- Control
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- MiscStatus
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\MiscStatus
- 1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
- ToolboxBitmap32
- In HKEY_CLASSES_ROOT\CLSID
- {48E59294-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59294-9880-11CF-9754-00AA00C00908}
- InprocServer32
- In HKEY_CLASSES_ROOT\CLSID
- {48E59295-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59295-9880-11CF-9754-00AA00C00908}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {48E59290-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {48E59291-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59291-9880-11CF-9754-00AA00C00908}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59291-9880-11CF-9754-00AA00C00908}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59291-9880-11CF-9754-00AA00C00908}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {48E59292-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59292-9880-11CF-9754-00AA00C00908}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59292-9880-11CF-9754-00AA00C00908}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59292-9880-11CF-9754-00AA00C00908}
- TypeLib
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\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\InprocServer32
- ThreadingModel="Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59291-9880-11CF-9754-00AA00C00908}\TypeLib
- Version="1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59292-9880-11CF-9754-00AA00C00908}\TypeLib
- Version="1.0"
Step 4
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsp3.tmp
Step 5
Search and delete these files
- %User Temp%\nsa2.tmp
- %User Temp%\nsp3.tmp\data116.exe
- %System%\MSINET.OCX
- %User Startup%\santa.bat
- %System%\data116.txt
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_VB.JBT. 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 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.
- %User Temp%\nsv1.tmp
- %User Temp%\nsp3.tmp
Step 8
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
- {48E59293-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {48E59294-9880-11CF-9754-00AA00C00908}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {48E59295-9880-11CF-9754-00AA00C00908}
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