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JAVA_EXPLYOT.GRR

October 09, 2012
 Analysis by: Mark Joseph Manahan
 ALIASES:

Exploit:Java/CVE-2012-1723.I (Microsoft), Exploit.Java.CVE-2012-0507.nc (Kaspersky), Java/Exploit.CVE-2012-0507.CW trojan (ESET), Troj/JavaDl-FC (Sophos), Exploit-CVE2012-1723 (McAfee)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Java Class

Initial Samples Received Date:

18 Jul 2012

Arrival Details

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

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Temp%\{Random File 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.)

Other Details

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

This is a Java class file that is used to execute an exploit code. Once successful, it may download a possibly malicious file from a certain URL.

The URL where this malware downloads the said file depends on the parameter passed on to it by its components.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.282.03

FIRST VSAPI PATTERN DATE:

24 Jul 2012

VSAPI OPR PATTERN File:

9.283.00

VSAPI OPR PATTERN Date:

25 Jul 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_EXPLYOT.GRR 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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