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TROJ_MDROPPER.HI

October 09, 2012
 Analysis by: Rhena Inocencio
 ALIASES:

Exploit:Win32/CVE-2012-0158 (Microsoft), Bloodhound.Exploit.457 (Symantec)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

270,848 bytes

File Type:

XLS

Initial Samples Received Date:

11 Mar 2008

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Dropping Routine

This Trojan drops the following files:

  • {All User's Profile}\Application Data\mspool.dll
  • %User Profile%\{number}.tmp
  • %User Profile%\{Malware File Name}.xls

(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 executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

5.152.03

FIRST VSAPI PATTERN DATE:

11 Mar 2008

VSAPI OPR PATTERN File:

5.153.00

VSAPI OPR PATTERN Date:

12 Mar 2008

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_MDROPPER.HI

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.  
  • {All User's Profile}\Application Data\mspool.DLL
  • %User Profile%\{number}.tmp
  • %User Profile%\{Malware File Name}.xls

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROPPER.HI. 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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