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TROJ_ALUREON.SME

October 09, 2012
 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be downloaded by other malware/grayware/spyware from remote sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

03 Nov 2010

Payload:

Drops files

Arrival Details

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

It may be downloaded by other malware/grayware/spyware from remote sites.

Installation

This Trojan drops the following files:

  • %User Temp%\UAC{random characters}.tmp - WORM_TDSS.SMB

(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.)

NOTES:

It exploits the following vulnerability to execute the dropped WORM_TDSS.SMB malware:

It patches the legitimate file %System%\msvcrt.dll then starts the normal service msiserver to load the WORM_TDSS.SMB malware.

This malware does not continue with its routines and will terminate if the affected system's locale is any of the following:

  • Azerbaijan
  • Belarus
  • Kazakhstan
  • Kyrgyzstan
  • Russia
  • Uzbekistan
  • Ukraine

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.589.00

VSAPI OPR PATTERN Date:

03 Nov 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

Remove malware files dropped/downloaded by TROJ_ALUREON.SME

    WORM_TDSS.SMB

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ALUREON.SME. 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 4

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. Microsoft Security Bulletin MS99-006


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