Analysis by: Jed Valderama
ALIASES:

Exploit:Java/CVE-2012-4681.AL (Microsoft)

 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

Infection Channel: Downloaded from the Internet

This is used as a component of other malware. It exploits a vulnerability in several versions of Oracle Java Runtime Environment (JRE) component. It allows this Trojan to execute arbitrary codes on the affected system.

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

It accesses websites to download files. This action allows this malware to possibly add other malware on the affected computer.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: Varies
File Type: Java Class
Initial Samples Received Date: 01 Feb 2012
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

Download Routine

This Trojan accesses websites to download the following files:

  • http://{BLOCKED}rco.com.br/imgs/a22.gif

Other Details

More information on this vulnerability can be found below:

However, as of this writing, the said sites are inaccessible.

NOTES:

This malware is used as a component of other malware. It exploits multiple vulnerabilities in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 6 and earlier which allow remote attackers to execute arbitrary code through a specially crafted applet that bypasses SecurityManager restrictions.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.748.05
FIRST VSAPI PATTERN DATE: 01 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_EKSPLOYT.AE. 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.oracle.com/technetwork/topics/security/alert-cve-2012-4681-1835715.html


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