Analysis by: Karl Dominguez

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: Varies
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 Oct 2010
Payload: Downloads files, Connects to URLs/IPs

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\{random characters}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It stays memory-resident by injecting codes into the following processes:

  • svchost.exe
  • csrss.exe
  • lsass.exe

It injects codes into the following process(es):

  • firefox.exe
  • Maxthon.exe
  • iexplore.exe

Autostart Technique

This Trojan drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:

  • {spaces}.lnk

Other System Modifications

This Trojan deletes the following folders:

  • %User Profile%\Local Settings\history

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • www.{BLOCKED}te.10dig.net
  • {BLOCKED}lmall.8866.org
  • {BLOCKED}er.{BLOCKED}ts.org
  • {BLOCKED}ns.{BLOCKED}8.net
  • {BLOCKED}ercenter.vicp.cc

It saves the files it downloads using the following names:

  • %User Profile%\Local Settings\{random characters}

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

  • www.microsoft.com

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.540.06
FIRST VSAPI PATTERN DATE: 15 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 and note files detected as TROJ_VUNDO.SMCP

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this file

[ 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.
  • {spaces}.lnk

Step 5

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