TROJ_MALF.EX
TrojanDropper:Win32/Malf.gen (Microsoft); Trojan.Win32.Generic!BT (Sunbelt)
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.
It modifies files, disabling programs and applications from properly running.
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 files:
- %User Profile%\Application Data\Microsoft
(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.)
It deletes the following files:
- %Temp%\EUPD-f4f588c509e8c31e.EXE
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\ECAT\
Temp
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\ECAT\
Temp
ServiceUid = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812
ServiceVersion = "cf8"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812
ServiceUid = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812
ServiceDate = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812
ServiceInfo = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812
ServiceRun = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812Driver
MemoryTrackerConfig = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Mot210812Driver
MonitorConfig = "2"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager
GlobalFlag = "84"
Dropping Routine
This Trojan drops the following files:
- %System%\drivers\Mot210812.sys
- %System%\Mot210812.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-18
- %User Profile%\RSA\MachineKeys
(Note: %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 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
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\ECAT
- Temp
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\ECAT\Temp
- ServiceUid = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812
- ServiceVersion = "cf8"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812
- ServiceUid = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812
- ServiceDate = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812
- ServiceInfo = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812
- ServiceRun = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812Driver
- MemoryTrackerConfig = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Mot210812Driver
- MonitorConfig = "2"
Step 4
Restore this modified 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\SYSTEM\ControlSet001\Control\Session Manager
- GlobalFlag = "84"
Step 5
Search and delete these files
- %System%\drivers\Mot210812.sys
- %System%\Mot210812.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-18
- %User Profile%\RSA\MachineKeys
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_MALF.EX. 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.
- %User Profile%\Application Data\Microsoft
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.
- %Temp%\EUPD-f4f588c509e8c31e.EXE
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