JAVA_DLOAD.MB

October 09, 2012
 Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

8,192 bytes

File Type:

Java Class

Memory Resident:

No

Initial Samples Received Date:

25 Aug 2011

Payload:

Downloads files

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

  • Java Runtime Environment

Other Details

More information on this vulnerability can be found below:

NOTES:
This is Trend Micro's detection for malicious java class which exploits the vulnerability stated in CVE-2010-0840.

If exploit is successful, the malware downloads a file from a certain URL and saves it using a random file name.

The URL, however, is not specified in the code.

The downloaded file is then executed, thus, the malicious behaviors of the said file are also exhibited in the system.

  SOLUTION

Minimum Scan Engine:

8.900

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product to delete files detected as JAVA_DLOAD.MB. 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 3

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

 

NOTES:

RECOMMENDATIONS:

This malware is detected and removed by the latest Trend Micro anti-malware engine and pattern. Always keep pattern files and engines up-to-date. To know more about updating your Trend Micro product’s pattern, please refer to the following Trend Micro support page:


Note: The steps apply for specific products indicated in the page.

To actively detect and protect your machine, enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support page to know more about enabling real-time scanning in your Trend Micro product:

Enable firewall to protect against threats. More information here.

Be aware of social engineering attacks.

Monitor network connections for any suspicious connection or connectivity.

Regularly update list of sites that are trusted.

Always keep software patch levels up-to-date.

Avoid visiting un-trusted sites that may redirect or download malware into the system.


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