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TROJ_MDROPPE.M

February 23, 2011
 Analysis by: Christopher Daniel So
 ALIASES:

Trojan.Mdropper (Symantec); Troj/XLSDrop-A (Sophos)

 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 be unknowingly downloaded by a user while visiting malicious websites.

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

  TECHNICAL DETAILS

File Size:

157,185 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

06 Jan 2011

Arrival Details

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

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\svohost.exe - detected as BKDR_VAGOTO.SMA
  • %User Profile%\Local Settings\Wmi.exe - detected as BKDR_VAGOTO.SMA

(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.. %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 files it drops, prompting the affected system to exhibit the malicious routines they contain.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.749.00

VSAPI PATTERN Date:

06 Jan 2011

VSAPI PATTERN Date:

1/6/2011 12:00:00 AM

Step 1

For Windows ME and XP 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_MDROPPE.M

    BKDR_VAGOTO.SMA

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROPPE.M 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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