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SWF_DROPPR.IJ

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 Modified by: Christopher Daniel So
 ALIASES:

Trojan.Swifi (Symantec)

 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

Infection Channel:

Downloaded from the Internet


This malware is loaded by HTML_EXPDROP.II. It attempts to connect to a site to download an archive file containing other files.

The downloaded files are executed, loading other files detected as TROJ_PLUGX.SME and TROJ_PLUGX.ME. As a result, malicious routines of the executed files are exhibited on the affected system.

This Trojan may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size:

8,372 bytes

File Type:

SWF

Initial Samples Received Date:

17 Sep 2012

Payload:

Downloads files

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

NOTES:

Once this malware is loaded by exploit.html, detected as HTML_EXPDROP.II, it exploits the following vulnerability to download other malware:

  • CVE-2010-2884

It attempts to connect to the following site to download a malicious file:

  • http://www.{BLOCKED}e.com/test.exe

The downloaded file is a self-extracting archive containing the following 3 files:

  • Nv.exe - a non-malicious legitimate file
  • Nv.mp3 - detected by Trend Micro as TROJ_PLUGX.SME
  • NvSmartMax.dll - detected by Trend Micro as TROJ_PLUGX.ME

It executes the file Nv.exe, which in turn loads NvSmartMax.dll. As a result, malicious behavior of the downloaded file is exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.406.02

FIRST VSAPI PATTERN DATE:

19 Sep 2012

VSAPI OPR PATTERN File:

9.407.00

VSAPI OPR PATTERN Date:

19 Sep 2012

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

Close all opened browser windows

Step 3

Remove malware files dropped/downloaded by SWF_DROPPR.IJ

Step 4

Scan your computer with your Trend Micro product to delete files detected as SWF_DROPPR.IJ. 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 5

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.  


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