Analysis by: Michael Cabel
 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:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It bears the file icons of certain applications to avoid easy detection and consequent removal.

It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 02 May 2009
Payload: Connects to URLs/IPs

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This spyware drops the following component file(s):

  • %User Temp%\fontbuf.dll - also detected as TSPY_DOJACK.A

(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.)

It bears the file icons of the following applications:

  • Microsoft Word

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
FONTBUF = "rundll32.exe %User Temp%\fontbuf.dll,XMLResCfun FONTBUF 0"

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}r.{BLOCKED}ster.com:443/cxpid/submit.php?SessionID={Random ID}
  • http://{BLOCKED}r.{BLOCKED}ster.com:443/send.php?id={Random ID}

Other Details

This spyware connects to the following website to send and receive information:

  • http://{BLOCKED}r.{BLOCKED}ster.com:443/cxgid/{Computer Name}/{Random Numbers}/{Random Numbers}/index.php
  • http://{BLOCKED}r.{BLOCKED}ster.com:443/query.php?id={Random ID}

However, as of this writing, the said sites are inaccessible.

NOTES:

This spyware also drops and opens the following legitimate word file to trick users into thinking that the executed file is legitimate:

  • %User Temp%\17λ×Էٵľ³ÄÚ²ØÈ˸ſö.doc

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 6.104.10
FIRST VSAPI PATTERN DATE: 02 May 2009
VSAPI OPR PATTERN File: 6.105.00
VSAPI OPR PATTERN Date: 04 May 2009

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • FONTBUF = "rundll32.exe %User Temp%\fontbuf.dll,XMLResCfun FONTBUF 0"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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%\17λ×Էٵľ³ÄÚ²ØÈ˸ſö.doc

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_DOJACK.A. 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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