TROJ_FAKEMS.USRM
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Dropped by other malware
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
3,735,552 bytes
EXE
Yes
04 Jun 2018
Drops files, Connects to URLs/IPs
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 drops the following copies of itself into the affected system and executes them:
- %Windows%\ime\{random}{malware name}.exe
- %Windows%\{malware name}.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It drops the following files:
- %System%\drivers\npf.sys
- %Windows%\dllhost\MigrationDump\Packet.dll
- %Windows%\dllhost\MigrationDump\wpcap.dll
- %Windows%\dllhost\MigrationDump\dialers.exe
- %Windows%\dllhost\MigrationDump\msvcr100.dll
- %Windows%\dllhost\Eternalblue\AppCapture_x64.dll
- %Windows%\dllhost\Eternalblue\AppCapture_x32.dll
- %Windows%\dllhost\Eternalblue\svchost.xml
- %Windows%\dllhost\Eternalblue\spoolsrv.xml
- %Windows%\dllhost\Eternalblue\specials\cnli-1.dll
- %Windows%\dllhost\Eternalblue\specials\coli-0.dll
- %Windows%\dllhost\Eternalblue\specials\crli-0.dll
- %Windows%\dllhost\Eternalblue\specials\exma-1.dll
- %Windows%\dllhost\Eternalblue\specials\libeay32.dll
- %Windows%\dllhost\Eternalblue\specials\libxml2.dll
- %Windows%\dllhost\Eternalblue\specials\posh-0.dll
- %Windows%\dllhost\Eternalblue\specials\spoolsrv.exe
- %Windows%\dllhost\Eternalblue\specials\ssleay32.dll
- %Windows%\dllhost\Eternalblue\specials\svchost.exe
- %Windows%\dllhost\Eternalblue\specials\tibe-2.dll
- %Windows%\dllhost\Eternalblue\specials\trch-1.dll
- %Windows%\dllhost\Eternalblue\specials\trfo-2.dll
- %Windows%\dllhost\Eternalblue\specials\tucl-1.dll
- %Windows%\dllhost\Eternalblue\specials\ucl.dll
- %Windows%\dllhost\Eternalblue\specials\xdvl-0.dll
- %Windows%\dllhost\Eternalblue\specials\zlib1.dll
- %Windows%\dllhost\Eternalblue\specials\svchost.xml
- %Windows%\dllhost\Eternalblue\specials\spoolsrv.xml
- %Windows%\svchost.xml
- %Windows%\spoolsrv.xml
- %Windows%\dllhost\Mssql\Code.Sql
- %Windows%\dllhost\Mssql\Http.Sql
- %Windows%\dllhost\Mssql\isql.exe
- %Windows%\dllhost\Mssql\sqlack.exe
- %Windows%\dllhost\Mssql\msvcr71.dll
- %Windows%\dllhost\Mssql\ntwdblib.dll
- %Windows%\dllhost\Mssql\user.txt
- %Windows%\dllhost\Mssql\pass.txt
- %Windows%\dllhost\Struts045\Scan\IpDuan.txt
- %User Temp%\Networks\taskmgr.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It creates the following folders:
- %Windows%\dllhost
- %Windows%\dllhost\MigrationDump
- %Windows%\dllhost\Eternalblue
- %Windows%\dllhost\Eternalblue\specials
- %Windows%\dllhost\Mssql
- %Windows%\dllhost\Struts045
- %Windows%\dllhost\Struts045\Scan
- %User Temp%\Networks
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Autostart Technique
This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
Type = 272
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
Start = 2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
ErrorControl = 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
ImagePath = %Windows%\{malware filename}.exe
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
DisplayName = Disk Defragenter
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc\Security
Security = {hex values}
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
ObjectName = LocalSystem
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
Description = Provides disk defragmentation
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc\Enum
0 = Root\LEGACY_CEFRAGSVC\0000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc\Enum
Count = 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc\Enum
NextInstance = 1
It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc\Security
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\cefragsvc\Enum
It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\{malware name}.exe
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other System Modifications
This Trojan modifies the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.bat
(Default) = txtfile
(Note: The default value data of the said registry entry is batfile.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.cmd
(Default) = txtfile
(Note: The default value data of the said registry entry is cmdfile.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.js
(Default) = txtfile
(Note: The default value data of the said registry entry is JSFile.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.vbs
(Default) = txtfile
(Note: The default value data of the said registry entry is VBSFile.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.VBE
(Default) = txtfile
(Note: The default value data of the said registry entry is VBEFile.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.reg
(Default) = txtfile
(Note: The default value data of the said registry entry is regfile.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {random IP addresses}
It adds the following scheduled tasks:
- Task Name: Flashlbm
Schedule: Every one minute
Task to run: cmd /c echo Y|cacls %User Temp%\Networks\taskmgr.exe /p everyone:F - Task Name: Miscfostlbm
Schedule: Every one minute
Task to run: cmd /c %Windows%\ime\{malware filename}.exe - Task Name: Netframeworklbm
Schedule: Every one minute
Task to run: cmd /c echo Y|cacls %Windows%\{malware filename}.exe /p everyone:F
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
NOTES:
This Trojan creates the following registry entry under this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{Program Name} Debugger = %System%\svchost.exe
Where: {Program Name} can be any of the following:
- powershell.exe
- wscript.exe
- sethc.exe
- magnify.exe
- perfmon.exe
SOLUTION
9.850
14.294.04
04 Jun 2018
14.295.00
05 Jun 2018
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
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\SYSTEM\CurrentControlSet\Services\cefragsvc
- Type = 272
- Type = 272
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- Start = 2
- Start = 2
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- ErrorControl = 1
- ErrorControl = 1
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- ImagePath = %Windows%\{malware filename}.exe
- ImagePath = %Windows%\{malware filename}.exe
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- DisplayName = Disk Defragenter
- DisplayName = Disk Defragenter
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc\Security
- Security = {hex values}
- Security = {hex values}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- ObjectName = LocalSystem
- ObjectName = LocalSystem
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- Description = Provides disk defragmentation
- Description = Provides disk defragmentation
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc\Enum
- 0 = Root\LEGACY_CEFRAGSVC\0000
- 0 = Root\LEGACY_CEFRAGSVC\0000
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc\Enum
- Count = 1
- Count = 1
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc\Enum
- NextInstance = 1
- NextInstance = 1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\powershell.exe
- Debugger = %System%\svchost.exe
- Debugger = %System%\svchost.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\wscript.exe
- Debugger = %System%\svchost.exe
- Debugger = %System%\svchost.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\sethc.exe
- Debugger = %System%\svchost.exe
- Debugger = %System%\svchost.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\magnify.exe
- Debugger = %System%\svchost.exe
- Debugger = %System%\svchost.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\perfmon.exe
- Debugger = %System%\svchost.exe
- Debugger = %System%\svchost.exe
Step 5
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\SYSTEM\CurrentControlSet\Services
- cefragsvc
- cefragsvc
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- Security
- Security
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cefragsvc
- Enum
- Enum
Step 6
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\SOFTWARE\Classes\.bat
- From: (Default) = txtfile
To: (Default) = batfile
- From: (Default) = txtfile
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.cmd
- From: (Default) = txtfile
To: (Default) = cmdfile
- From: (Default) = txtfile
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.js
- From: (Default) = txtfile
To: (Default) = JSFile
- From: (Default) = txtfile
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.vbs
- From: (Default) = txtfile
To: (Default) = VBSFile
- From: (Default) = txtfile
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.VBE
- From: (Default) = txtfile
To: (Default) = VBEFile
- From: (Default) = txtfile
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.reg
- From: (Default) = txtfile
To: (Default) = regfile
- From: (Default) = txtfile
Step 7
Deleting Scheduled Tasks
The following {Task Name} - {Task to be run} listed should be used in the steps identified below:
- Task Name: Flashlbm
Task to be run: cmd /c echo Y|cacls %User Temp%\Networks\taskmgr.exe /p everyone:F - Task Name: Miscfostlbm
Task to run: cmd /c %Windows%\ime\{malware filename}.exe - Task Name: Netframeworklbm
Task to be run: cmd /c echo Y|cacls %Windows%\{malware filename}.exe /p everyone:F
For Windows 2000, Windows XP, and Windows Server 2003:
- Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
System Tools>Scheduled Tasks. - Locate each {Task Name} values listed above in the Name column.
- Right-click on the said file(s) with the aforementioned value.
- Click on Properties. In the Run field, check for the listed {Task to be run}.
- If the strings match the list above, delete the task.
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open the Windows Task Scheduler. To do this:
• On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
• On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter. - In the left panel, click Task Scheduler Library.
- In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
- In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
- If the said string is found, delete the task.
Step 8
Search and delete this file
- %System%\drivers\npf.sys
- %Windows%\dllhost\MigrationDump\Packet.dll
- %Windows%\dllhost\MigrationDump\wpcap.dll
- %Windows%\dllhost\MigrationDump\dialers.exe
- %Windows%\dllhost\MigrationDump\msvcr100.dll
- %Windows%\dllhost\Eternalblue\AppCapture_x64.dll
- %Windows%\dllhost\Eternalblue\AppCapture_x32.dll
- %Windows%\dllhost\Eternalblue\svchost.xml
- %Windows%\dllhost\Eternalblue\spoolsrv.xml
- %Windows%\dllhost\Eternalblue\specials\cnli-1.dll
- %Windows%\dllhost\Eternalblue\specials\coli-0.dll
- %Windows%\dllhost\Eternalblue\specials\crli-0.dll
- %Windows%\dllhost\Eternalblue\specials\exma-1.dll
- %Windows%\dllhost\Eternalblue\specials\libeay32.dll
- %Windows%\dllhost\Eternalblue\specials\libxml2.dll
- %Windows%\dllhost\Eternalblue\specials\posh-0.dll
- %Windows%\dllhost\Eternalblue\specials\spoolsrv.exe
- %Windows%\dllhost\Eternalblue\specials\ssleay32.dll
- %Windows%\dllhost\Eternalblue\specials\svchost.exe
- %Windows%\dllhost\Eternalblue\specials\tibe-2.dll
- %Windows%\dllhost\Eternalblue\specials\trch-1.dll
- %Windows%\dllhost\Eternalblue\specials\trfo-2.dll
- %Windows%\dllhost\Eternalblue\specials\tucl-1.dll
- %Windows%\dllhost\Eternalblue\specials\ucl.dll
- %Windows%\dllhost\Eternalblue\specials\xdvl-0.dll
- %Windows%\dllhost\Eternalblue\specials\zlib1.dll
- %Windows%\dllhost\Eternalblue\specials\svchost.xml
- %Windows%\dllhost\Eternalblue\specials\spoolsrv.xml
- %Windows%\svchost.xml
- %Windows%\spoolsrv.xml
- %Windows%\dllhost\Mssql\Code.Sql
- %Windows%\dllhost\Mssql\Http.Sql
- %Windows%\dllhost\Mssql\isql.exe
- %Windows%\dllhost\Mssql\sqlack.exe
- %Windows%\dllhost\Mssql\msvcr71.dll
- %Windows%\dllhost\Mssql\ntwdblib.dll
- %Windows%\dllhost\Mssql\user.txt
- %Windows%\dllhost\Mssql\pass.txt
- %Windows%\dllhost\Struts045\Scan\IpDuan.txt
- %User Temp%\Networks\taskmgr.exe
Step 9
Search and delete these folders
- %Windows%\dllhost
- %Windows%\dllhost\MigrationDump
- %Windows%\dllhost\Eternalblue
- %Windows%\dllhost\Eternalblue\specials
- %Windows%\dllhost\Mssql
- %Windows%\dllhost\Struts045
- %Windows%\dllhost\Struts045\Scan
- %User Temp%\Networks
Step 10
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEMS.USRM. 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 11
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEMS.USRM. 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 the following Trend Micro Support pages for more information:
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