Analysis by: Kathleen Notario
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 195,964 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 23 Jul 2010
Payload: Drops files

Installation

This Trojan drops and executes the following files:

  • %User Temp%\ {malware name}.pdf - non-malicious .PDF file
  • %User Temp%\ offer.exe - detected as TROJ_PROTUX.BB

(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.)

Dropping Routine

This Trojan takes advantage of the following software vulnerabilities to drop malicious files:

  • Adobe Reader and Acrobat 'newplayer()' JavaScript Method Remote Code Execution Vulnerability

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.334.02
FIRST VSAPI PATTERN DATE: 24 Jul 2010
VSAPI OPR PATTERN File: 7.581.00
VSAPI OPR PATTERN Date: 29 Oct 2010

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

Scan your computer with your Trend Micro product to delete files detected as JS_UTOTI.JA. 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 3

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.


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