Analysis by: kathleenno
ALIASES:

Exploit:Java/CVE-2009-3869.M (Microsoft); Exploit-CVE2009-3869.a !! (Mcafee); Troj/ClsLdr-X (Sophos); Exploit.Java.CVE-2009-3867 (Ikarus)

 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 malware is a component of a malicious Java archive file (.JAR). It takes advantage of a stack-based buffer overflow in a function in Java Runtime Environment (JRE) that allows remote attackers to execute arbitrary code. More information can be found on the following link:

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 2,906 bytes
File Type: Java Class
Memory Resident: No
Initial Samples Received Date: 05 May 2011

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

NOTES:

This malware is a component of a malicious Java archive file (.JAR). It takes advantage of a stack-based buffer overflow in a function in Java Runtime Environment (JRE) that allows remote attackers to execute arbitrary code. More information can be found on the following link:

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.138.17
FIRST VSAPI PATTERN DATE: 05 May 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_OBFUS.WA. 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. http://www.oracle.com/technetwork/topics/security/whatsnew/index.html


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