TROJ_MDROP.EXT

November 06, 2014
 ALIASES:

Exploit:Win32/CVE-2014-4114 (Microsoft),Trojan-Downloader.Win32.Genome.jxcr (Kaspersky), , Win32/Exploit.CVE-2014-4114.Z (ESET), Trojan.PPDropper (Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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 takes advantage of software vulnerabilities in certain software to drop malicious files. 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:

398,621 bytes

File Type:

PPTX

Initial Samples Received Date:

04 Nov 2014

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.

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\svcmgr.gif - detected as TROJ_DLOADER.EXT
  • %User Temp%\svcmpp.inf – detected as INF_EXTANT.A

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It takes advantage of unknown vulnerabilities in the following software to drop malicious files:

  • CVE-2014-6352

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:

9.700

FIRST VSAPI PATTERN FILE:

11.256.06

FIRST VSAPI PATTERN DATE:

04 Nov 2014

VSAPI OPR PATTERN File:

11.257.00

VSAPI OPR PATTERN Date:

05 Nov 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by TROJ_MDROP.EXT. (Note: Please skip this step if the threats listed below have already been removed.)

    • INF_EXTANT.A
    • TROJ_DLOADER.EXT

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROP.EXT. 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.

  • https://technet.microsoft.com/en-us/library/security/3010060.aspx


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