Analysis by: Jimelle Monteser
ALIASES:

Exploit.Java.CVE, Exploit.Java.CVE (Ikarus), Exploit:Java/CVE-2011-3544 (Microsoft), a variant of Java/Exploit.Agent.OTT trojan, a variant of Java/Exploit.Agent.OTT trojan (NOD32), Trojan.Maljava!gen21 (Norton)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Others

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This malware 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: 9,025 bytes
File Type: Java Class
Initial Samples Received Date: 05 Nov 2013

Arrival Details

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

Installation

This malware drops the following file(s)/component(s):

  • %User Temp%\{random name}.exe
  • %User Temp%\{random name}.dll

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Download Routine

This malware downloads 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.

Other Details

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

NOTES:
The file type will depend on the parameter passed into the script.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.396.05
FIRST VSAPI PATTERN DATE: 07 Nov 2013
VSAPI OPR PATTERN File: 10.397.00
VSAPI OPR PATTERN Date: 08 Nov 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Search and delete these files

[ Learn More ]
There may be some 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%\{random name}.exe
  • %User Temp%\{random name}.dll

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_EXPLOYT.JQ. 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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