This malware was involved in an attack targeting Banco de Brasil users during May 2013. It came bundled as a plugin for a customized banking browser. Once executed, it steals banking information from the affected system. Users with systems affected by this malware may find their online banking accounts compromised.
To get a one-glance comprehensive view of the behavior of this Worm, refer to the Threat Diagram shown below.
This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It 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 worm drops the following copies of itself into the affected system and executes them:
- %System%\install\server.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following component file(s):
- %Application Data%\logs.dat
- %User Temp%\XX--XX--XX.TXT
- %User Temp%\UuU.uUu
- %User Temp%\XxX.xXx
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %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 creates the following folders:
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- _x_X_UPDATE_X_x_
- _x_X_PASSWORDLIST_X_x_
- _x_X_BLOCKMOUSE_X_x_
- ***MUTEX***
- ***MUTEX***_PERSIST
It stays memory-resident by injecting codes into the following processes:
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Policies = "%System%\install\server.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Policies = "%System%\install\server.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
HKLM = "%System%\install\server.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%System%\install\server.exe"
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\vítima
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{08B0E5JF-4FCB-11CF-AAA5-00401C6XX500}
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\vítima
FirstExecution = "{current date and time with this format: dd/mm/yyy -- hh:mm}"
HKEY_CURRENT_USER\Software\vítima
NewIdentification = "vítima"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{08B0E5JF-4FCB-11CF-AAA5-00401C6XX500}
StubPath = "%System%\install\server.exe"
Propagation
This worm creates the following folders in all removable drives:
- {removable drive letter}:\RECYCLER
- {removable drive letter}:\RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013
It drops the following copy(ies) of itself in all removable drives:
- {removable drive letter}:\RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
[autorun]
;open=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
icon=shell32.dll,4
shellexecute=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
label=PENDRIVE
action=Open folder to view files
shell\Open=Open
shell\Open\command=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
shell\Open\Default=1
Information Theft
This worm gathers the following data:
- sensitive information such as account names, email addresses and passwords by monitoring web activities and logging keystrokes
Stolen Information
This worm sends the gathered information via HTTP POST to the following URL:
- {BLOCKED}-200-41.{BLOCKED}ol.com.br
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
Restart in Safe Mode
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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 3
Delete this registry value
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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
- Policies = "%System%\install\server.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
- Policies = "%System%\install\server.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- HKLM = "%System%\install\server.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKCU = "%System%\install\server.exe"
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>policies>Explorer>Run - In the right panel, locate and delete the entry:
Policies = "%System%\install\server.exe" - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Policies>Explorer>Run - In the right panel, locate and delete the entry:
Policies = "%System%\install\server.exe" - 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:
HKLM = "%System%\install\server.exe" - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
HKCU = "%System%\install\server.exe" - Close Registry Editor.
Step 4
Delete this registry key
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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_CURRENT_USER\Software
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- {08B0E5JF-4FCB-11CF-AAA5-00401C6XX500}
To delete registry keys this malware/grayware 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_CURRENT_USER>Software - Still in the left panel, locate and delete the key:
vítima - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Active Setup>Installed Components - Still in the left panel, locate and delete the key:
{08B0E5JF-4FCB-11CF-AAA5-00401C6XX500} - Close Registry Editor.
Step 5
Search and delete these files
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There may be some 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.
- %Application Data%\logs.dat
- %User Temp%\XX--XX--XX.TXT
- %User Temp%\UuU.uUu
- %User Temp%\XxX.xXx
To delete malware/grayware files:
- Search for the following files:
- %Application Data%\logs.dat
- %User Temp%\XX--XX--XX.TXT
- %User Temp%\UuU.uUu
- %User Temp%\XxX.xXx
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 6
Search and delete these folders
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Please make sure you check the
Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
- %System%\install
- {removable drive letter}:\RECYCLER
To delete malware/grayware/spyware folders:
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
- %System%\install
- {removable drive letter}:\RECYCLER
- In the Look In drop-down list, select My Computer, then press Enter.
- Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2 to 4 for the remaining folders:
- %System%\install
- {removable drive letter}:\RECYCLER
Step 7
Search and delete AUTORUN.INF files created by WORM_LUDER.USR that contain these strings
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[autorun]
;open=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
icon=shell32.dll,4
shellexecute=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
label=PENDRIVE
action=Open folder to view files
shell\Open=Open
shell\Open\command=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
shell\Open\Default=1
To identify and delete AUTORUN.INF files created:
- Right-click the Start button then choose Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
AUTORUN.INF - In the Look in: drop-down list, select a drive, then press Enter.
- Select the file, then open using Notepad.
- Check if the following lines are present in the file:
[autorun]
;open=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
icon=shell32.dll,4
shellexecute=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
label=PENDRIVE
action=Open folder to view files
shell\Open=Open
shell\Open\command=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
shell\Open\Default=1
- If the lines are present, delete the file.
- Repeat steps 3 to 6 for the remaining AUTORUN.INF files in other remaining removable drives.
- Close Search Results.
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_LUDER.USR. 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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