Analysis by: JessaD
ALIASES:

Trojan-Downloader.Java.OpenStream.bf (Kaspersky)

 PLATFORM:

Windows 2000, XP, 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 takes advantage of the following software vulnerabilities to download possibly malicious files:

  • CVE-2010-0840

This Trojan executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It checks the operating system name of the affected computer.

  TECHNICAL DETAILS

File Size: 6,097 bytes
File Type: Java Class
Memory Resident: Yes
Initial Samples Received Date: 24 Jan 2011
Payload: Downloads files

Arrival Details

This malware arrives via the following means:

  • It is bundled inside a Java package named "Rleh" that is hosted in a malicious Web site.

Download Routine

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

  • CVE-2010-0840

It saves the files it downloads using the following names:

  • %User Temp%\{random name}.exe

(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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan checks the operating system name of the affected computer if it is any of the following:

  • Windows platform

More information on this vulnerability can be found below:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0840

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.806.14
VSAPI PATTERN Date: 02 Feb 2011
VSAPI PATTERN Date: 2/2/2011 12:00:00 AM

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_BYTEVER.HBB. 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 4

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.  http://www.java.com/en/download/manual.jsp


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