Analysis by: RonJay Kristoffer Caragay
ALIASES:

SWF:Nesty-A [Expl] (Avast); Exploit.SWF.CVE-2014-0497.f (Kaspersky); SWF/Exploit.ExKit.H (ESET-NOD32); Bloodhound.Flash.23 (Symantec); Trojan-Exploit/W32.CVE-2014-0497.4183.K (nProtect)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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 hosted on a website and run when a user accesses the said website.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 4,183 bytes
File Type: SWF
Memory Resident: No
Initial Samples Received Date: 29 Aug 2014
Payload: Downloads 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 hosted on a website and run when a user accesses the said website.

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It downloads a possibly malicious file from a certain URL. The URL where this malware downloads the said file depends on the parameter passed on to it by its components.

NOTES:

This Trojan checks if the affected system runs on any of the following operating system versions:

  • Windows XP
  • Windows Vista
  • Windows Server 2003 r2
  • Windows Server 2003
  • Windows 7
  • Windows 7 x64
  • Windows Server 2008 r2
  • Windows Server 2008
  • Windows 8
  • Windows 8 x64

After checking operating system versions, this Trojan checks the system the installed version of Adobe Flash Player. For Windows 8:

  • 11.3.372.94
  • 11.3.375.10
  • 11.3.376.12
  • 11.3.377.15
  • 11.3.378.5
  • 11.3.379.14
  • 11.6.602.167
  • 11.6.602.171
  • 11.6.602.180
  • 11.7.700.169
  • 11.7.700.202
  • 11.7.700.224

For other Windows operating systems:

  • 11.0.1.152
  • 11.1.102.55
  • 11.1.102.62
  • 11.1.102.63
  • 11.2.202.228
  • 11.2.202.223
  • 11.2.202.235
  • 11.3.300.257
  • 11.3.300.273
  • 11.4.402.278
  • 11.4.402.287
  • 11.5.502.110
  • 11.5.502.135
  • 11.5.502.146
  • 11.5.502.149
  • 11.6.602.168
  • 11.6.602.171
  • 11.6.602.180
  • 11.7.700.169
  • 11.7.700.202
  • 11.8.800.97
  • 11.8.800.50

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.116.07
FIRST VSAPI PATTERN DATE: 29 Aug 2014
VSAPI OPR PATTERN File: 11.117.00
VSAPI OPR PATTERN Date: 29 Aug 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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as SWF_NESTED.A. 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.


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