TROJ_BAMITAL.SM
TrojanDropper:Win32/Bamital.A (Microsoft); Generic Dropper.rj (McAfee); Trojan.Dropper (Symantec); Trojan-Dropper.Win32.Drooptroop.wc (Kaspersky); Trojan.Win32.Bamital.G (v) (Sunbelt); Trojan-Dropper:W32/Agent.NYL (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
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 adds the following registry keys:
HKEY_CLASSES_ROOT\00UATXSTQ
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Session Manager\AppCertDlls
HKEY_CURRENT_USER\Software\QG94S0NKSE
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
00UATXSTQ
KSE = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
00UATXSTQ
0NKSE = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
00UATXSTQ
00UATXSTQ = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\AppCertDlls
AppSecDll = "%System%\mshlps.dll"
HKEY_CURRENT_USER\Software\QG94S0NKSE
QG94S0NKSE = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows
LoadAppInit_DLLs = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows
AppInit_DLLs = "%System%\kbdsock.dll"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\sr\Parameters
FirstRun = "1"
Dropping Routine
This Trojan drops the following files:
- %System%\mshlps.dll
- %System%\kbdsock.dll
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
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_CLASSES_ROOT
- 00UATXSTQ
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
- AppCertDlls
- In HKEY_CURRENT_USER\Software
- QG94S0NKSE
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\00UATXSTQ
- KSE = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\00UATXSTQ
- 0NKSE = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\00UATXSTQ
- 00UATXSTQ = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\AppCertDlls
- AppSecDll = "%System%\mshlps.dll"
- In HKEY_CURRENT_USER\Software\QG94S0NKSE
- QG94S0NKSE = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
- LoadAppInit_DLLs = "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\Windows NT\CurrentVersion\Windows
- AppInit_DLLs = "%System%\kbdsock.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\sr\Parameters
- FirstRun = "1"
Step 5
Search and delete these components
- %System%\mshlps.dll
- %System%\kbdsock.dll
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_BAMITAL.SM. 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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