Analysis by: JasperM
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. 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: 28 Jun 2010
Payload: Connects to URLs/Ips, Downloads files

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

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

Installation

This Trojan drops the following non-malicious files:

  • %System Root%\DOCUMENTS AND SETTINGS\ALL USERS\FAVORITES\_favdata.dat

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Printers\Connections
subid = new

HKEY_CURRENT_USER\Printers\Connections
affid = 203

Download Routine

This Trojan accesses the following websites to download files:

  • http://www.citingsecurity.com/up4/setup
  • http://findermem.org/up4/setup
  • http://www.raisfind.org/up4/setup
  • http://www.raisfind.org/up4/install01
  • http://www.citingsecurity.com/up4/install01
  • http://findermem.org/up4/install01

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.275.80
VSAPI PATTERN Date: 29 Jun 2010
VSAPI PATTERN Date: 6/29/2010 12:00:00 AM

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

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_CURRENT_USER\Printers\Connections
    • subid = new
  • In HKEY_CURRENT_USER\Printers\Connections
    • affid = 203

Step 3

Search and delete these files

[ 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.  %System Root%\DOCUMENTS AND SETTINGS\ALL USERS\FAVORITES\_favdata.dat

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_TDSS.SMDJ. 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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