Malware Trojan.Maljava!gen23

Posted: September 4, 2012 in Encyclopedia viruses
Tags: , , , , ,

Virus AlertTrojan.Maljava!gen23 is a heuristic detection for files attempting to exploit the Oracle Java SE CVE-2012-1723 Remote Code Execution Vulnerability.

Technical details

Systems Affected:

Windows NT, Windows XP,Windows Server 2003, Windows Server 2008,Windows Vista, Windows 7, Solaris, Mac OS X, Linux, Windows 2000

CVE References: CVE-2012-1723

Technical details

Files that are detected as Trojan.Maljava!gen23 are considered malicious. We suggest that any files you believe are incorrectly detected be submitted to Symantec Security Response. For instructions on how to do this using Scan and Deliver, read Submit Virus Samples.

How to reduce the risk of infection

Recommendations:

  • 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.

Remove

If you have an infected Windows system file, you may need to replace it using the Windows installation CD.

Manual removal

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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