JAVA_LOADER.DR

October 09, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Exploit:Java/CVE-2012-0507.D (Microsoft), Trojan.Maljava (Symantec), Exploit.Java.CVE-2011-3544.np (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 malware downloads the file specified in its first parameter. It saves the downloaded file as %User Temp%\cgs8h{random number}.exe. It then executes the downloaded file by exploiting the vulnerability related to CVE-2011-3544 using certain command lines.

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

It does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

4,739 bytes

File Type:

Java Class

Initial Samples Received Date:

03 Apr 2012

Payload:

Downloads files

Arrival Details

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

More information on this vulnerability can be found below:

NOTES:

It downloads the file specified in its first parameter. It saves the downloaded file as %User Temp%\cgs8h{random number}.exe. It then executes the downloaded file by exploiting the vulnerability related to CVE-2011-3544 using the following command lines:

  • %User Temp%\cgs8h{random number}.exe
  • regsvr32 -s "%User Temp%\cgs8h{random number}.exe"

As a result, malicious routines of the downloaded file are exhibited on the affected system.

This malware does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine:

9.200

VSAPI OPR PATTERN File:

8.883.00

VSAPI OPR PATTERN Date:

03 Apr 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

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Temp%\cgs8h{random number}.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_LOADER.DR. 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 5

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.


Did this description help? Tell us how we did.