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JAVA_EXPLOIT.JDM

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size:

3,397 bytes

File Type:

Java Class

Initial Samples Received Date:

25 Feb 2012

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

NOTES:

This is the Trend Micro detection for malicious Java class files used as a component of other malware. Once the user accesses a malicious site, this malicious script is executed.

This file may download a possibly malicious file into the system. It saves the downloaded file as %User Temp%\best.exe. However, the URL where the file is downloaded is not found in the code of the malicious Java class file.

(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.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.798.08

FIRST VSAPI PATTERN DATE:

25 Feb 2012

VSAPI OPR PATTERN File:

8.799.00

VSAPI OPR PATTERN Date:

25 Feb 2012

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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JAVA_EXPLOIT.JDM. 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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