Analysis by: Nikko Tamana
ALIASES:

Trojan.Maljava (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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any downloading capability.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: Varies
File Type: Java Class
Memory Resident: No
Initial Samples Received Date: 26 Aug 2012
Payload: Drops files

Arrival Details

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

Installation

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

  • %User Temp%\MARKETING.EXE
  • %User Temp%\BASE{random value}.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan requires the following additional components to properly run:

  • win32.bin

NOTES:

It checks if Java versions are the following:

  • 1.6.0.31
  • 1.6.0.32
  • 1.6.0.33
  • 1.6.0.34
  • 1.7.0.2

If Java version is one of the following, it will not load one of its components named EnterpriseFrameworkDependencyInjectionContainer.class.

It checks if OS is Windows. It OS is not Windows, it will create a directory named {Malware Path}/PRT/Report/{OS Name}/Unknown OS.

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.350.05
FIRST VSAPI PATTERN DATE: 26 Aug 2012
VSAPI OPR PATTERN File: 9.351.00
VSAPI OPR PATTERN Date: 27 Aug 2012

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%\MARKETING.EXE
  • %User Temp%\BASE{random value}.EXE

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_KRYPTIK.TK. 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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