Analysis by: Karl Dominguez
ALIASES:

Trojan.Maljava (Symantec); Exploit-CVE2010-0840 (McAfee); Exploit.Java.CVE-2010-0840.eBookmark (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as a component bundled with malware/grayware packages. It executes when a user accesses certain websites where it is hosted.

  TECHNICAL DETAILS

File Size: 4,497 bytes
File Type: Java Class
Memory Resident: No
Initial Samples Received Date: 27 Mar 2011
Payload: Downloads files

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

It executes when a user accesses certain websites where it is hosted.

Download Routine

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

  • Vulnerability found in the Java Runtime Environment component in Oracle Java SE and Java for Business 6

Other Details

For more information on the aforementioned vulnerabilities, please see the following pages:

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.930.06
FIRST VSAPI PATTERN DATE: 27 Mar 2011

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_DLOADR.VTG. 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.


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