Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 622 bytes
File Type: Java Class
Memory Resident: No
Initial Samples Received Date: 13 Aug 2010

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://{BLOCKED}t.com/sw/mssaezv/etsg.jar

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Functions as a Java Applet is a component of a malicious Java archive file (.JAR) that is hosted in a malicious Web site. The said .JAR file contains the following files, detected as follows:
    • JavaUpdateApplication.class (622 bytes) as TROJ_JAVADL.A
    • JavaUpdateManager.class (5,496 bytes) as TROJ_JAVADL.B
  • Contains function used by TROJ_JAVADL.B to exploit a known vulnerability in MidiSystem.getSoundbank function

More information on this vulnerability can be found below:

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.380.01
VSAPI OPR PATTERN Date: 13 Aug 2010

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

Remove malware files dropped/downloaded by TROJ_JAVADL.A

     TROJ_JAVADL.B

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_JAVADL.A. 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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