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Backdoor.Padpin
Risk Level 1: Very Low
Discovered:
May 9, 2014
Updated:
May 20, 2014 9:44:15 PM
Type:
Trojan
Systems Affected:
Windows XP, Windows 7
SUMMARY
Backdoor.Padpin is a Trojan horse that targets automated teller machines (ATMs). It opens a back door on the compromised computer.
Antivirus Protection Dates
Initial Rapid Release version May 9, 2014 revision 036
Latest Rapid Release version May 9, 2014 revision 036
Initial Daily Certified version May 10, 2014 revision 001
Latest Daily Certified version May 10, 2014 revision 001
Initial Weekly Certified release date May 14, 2014
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
Wild Level: Low
Number of Infections: 0 - 49
Number of Sites: 0 - 2
Geographical Distribution: Low
Threat Containment: Easy
Removal: Easy
Damage
Damage Level: Medium
Payload: Opens a back door on the compromised computer.
Releases Confidential Info: Displays sensitive information to the attacker.
Compromises Security Settings: Disables the local network to avoid triggering alarms.
Distribution
Distribution Level: Low
TECHNICAL DETAILS
Backdoor.Padpin is a Trojan horse that targets automated teller machines (ATM). The Trojan enables an attacker to use the ATM PIN pad to submit commands to the Trojan.
Once executed, the Trojan creates the following file, which can be placed in any folder on the compromised computer:
[PATH TO THREAT]\ulssm.exe
The Trojan then creates the following registry entries so that it runs every time Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"ulssm.exe" = "[PATH TO THREAT]\ulssm.exe"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"ulssm.exe" = "[PATH TO THREAT]\ulssm.exe"
The Trojan can delete itself if it fails to gain control of the PIN pad or dispenser.
The Trojan runs in the background until a specific code is entered on the ATM's PIN pad.
The Trojan then opens a back door on the compromised computer, allowing an attacker to perform the following actions:
Dispense money from the compromised ATM
Select which cassette the ATM dispenses money from
Display cassette information such as bills left, denomination and total amount per cassette
Temporarily disable the local network to avoid triggering alarms when withdrawing money
Extend the duration of the session in order to continue stealing money
Delete the Trojan from the compromised ATM
Recommendations
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
For further information on the terms used in this document, please refer to the Security Response glossary.
REMOVAL
You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your computer has been affected by this risk.
Before proceeding further we recommend that you run a full system scan. If that does not resolve the problem you can try one of the options available below.
FOR NORTON USERS
If you are a Norton product user, we recommend you try the following resources to remove this risk.
Removal Tool
Run Norton Power Eraser (NPE)
Norton Power Eraser did not remove this risk
If you have an infected Windows system file, you may need to replace it using the Windows installation CD.
How to reduce the risk of infection
The following resources provide further information and best practices to help reduce the risk of infection.
Operating system updates to fix vulnerabilities
File sharing protection
Disable Autorun (CD/USB)
Best practices for instant messaging
Best practices for browsing the Web
Best practices for email
FOR BUSINESS USERS
If you are a Symantec business product user, we recommend you try the following resources to remove this risk.
Identifying and submitting suspect files
Submitting suspicious files to Symantec allows us to ensure that our protection capabilities keep up with the ever-changing threat landscape. Submitted files are analyzed by Symantec Security Response and, where necessary, updated definitions are immediately distributed through LiveUpdate™ to all Symantec end points. This ensures that other computers nearby are protected from attack. The following resources may help in identifying suspicious files for submission to Symantec.
Locate a sample of a threat
Submit a suspicious file to Symantec
Removal Tool
Run Symantec Power Eraser in Symantec Help (SymHelp)
About Symantec Power Eraser
Symantec Power Eraser User Guide
If you have an infected Windows system file, you may need to replace it using the Windows installation CD.
How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network
MANUAL REMOVAL
The following instructions pertain to all current Symantec antivirus products.
1. Performing a full system scan
How to run a full system scan using your Symantec product
2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.
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