Arrival Details
This backdoor may be downloaded from remote site(s) by the following malware:
It may be downloaded from the following remote sites:
- http://{BLOCKED}lcurrencyreport.com/cybercrime-suspect-arrested/up1.exe
Installation
This backdoor drops the following copies of itself into the affected system:
- %System Root%\Documents and Settings\All Users\svchost.exe - if running in virtual machine
- %System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name} - if running in admin account
- %User Temp%\ms{random characters}.{extension name} - if not running in admin account
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- {Decimal form of the Volume Serial Number of %System Root%}
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It stays memory-resident by injecting codes into the following processes:
- \system32\wuauclt.exe
- \syswow64\svchost.exe
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Temp%\ms{random}.{extension name}"
Other System Modifications
This backdoor creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:{malware name}"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download a file from C&C server and save it as %User Temp%\{random number}.exe
- Download a file from C&C server and save it in the folder %System Root%\Documents and Settings\All Users\ms{random number}.dat and loads it
- Start a process
- Uninstall itself
- Remote command prompt
(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}st.com/image.php
Other Details
This backdoor connects to the following URL(s) to check for an Internet connection:
NOTES:
The {extension name} of the dropped copy is any of the following:
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
Remove malware/grayware files that dropped/downloaded BKDR_ANDROM.NTW
Step 3
Scan your computer with your Trend Micro product and note files detected as BKDR_ANDROM.NTW
Step 4
Restart in Safe Mode
[ Learn More ]
[ back ]
To restart in Safe Mode:
• For Windows 2000 users
- Restart your computer.
- Press F8 when you see the Starting Windows bar at the bottom of the screen.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows XP users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Windows Advanced Options menu does not appear, try restarting then pressing F8 several times when the POST screen appears.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows Server 2003 users
- Restart your computer.
- Press F8 after Windows starts up. If the Windows Advanced Options menu does not appear, try restarting again and pressing F8 several times afterward.
- On the Windows Advanced Option menu, use the arrow keys to select Safe Mode then press Enter.
• For Windows Vista and Windows 7 users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Advanced Boot Options menu does not appear, try restarting and then pressing F8 several times after the POST screen is displayed.
- On the Advanced Boot Options menu, use the arrow keys to select the Safe Mode option, and then press Enter.
Step 5
Delete this registry value
[ Learn More ]
[ back ]
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\Microsoft\Windows\CurrentVersion\Run
- SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- {random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- Load = "%User Temp%\ms{random}.{extension name}"
To delete the registry value this malware created:
- Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
- In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe" - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies>Explorer>Run - In the right panel, locate and delete the entry:
{random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}" - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows NT>CurrentVersion>Windows - In the right panel, locate and delete the entry:
Load = "%User Temp%\ms{random}.{extension name}" - Close Registry Editor.
Step 6
Delete the registry entry with an unknown data value
[ Learn More ]
[ back ]
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\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- {random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:{malware name}"
To delete the registry entry this malware created:
- Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
- In the left panel of the Registry Editor window, double-click the following:
- HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\policies\\Explorer\\Run
- HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\SharedAccess\\Parameters\\FirewallPolicy\\StandardProfile\\AuthorizedApplications\\List
- In the right panel, locate and delete the entry or entries whose data value is the malware path and file name of the file(s) detected earlier.
- Close Registry Editor.
Step 7
Search and delete these files
[ Learn More ]
[ back ]
There may be some component files that are hidden. Please make sure you check the
Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
%User Temp%\{random number}.exe
%System Root%\Documents and Settings\All Users\ms{random number}.dat
To delete malware/grayware component files:
- Search for the following files:
%User Temp%\{random number}.exe
%System Root%\Documents and Settings\All Users\ms{random number}.dat
Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter. - Once located, select the file then press SHIFT+DELETE to permanently delete the file.
- Repeat the said steps for all files listed.
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ANDROM.NTW. 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.
Did this description help? Tell us how we did.