Analysis by: RonJay Kristoffer Caragay
ALIASES:

Exploit:SWF/Neclu (Microsoft); EXP/SWF.Neclu.B (Avira); Exploit-SWF.f (McAfee); SWF/Exploit.ExKit.D (ESET-NOD32); Exploit.SWF.Agent.js (Kaspersky)

 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

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 unknowingly downloaded by a user while visiting malicious websites.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: 8,475 bytes
File Type: SWF
Initial Samples Received Date: 05 Feb 2015

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 unknowingly downloaded by a user while visiting malicious websites.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan 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.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan is a zero-day exploit for the following vulnerability:

NOTES:

Once a compromised website is visited, the user's browser with a vulnerable version of Adobe Flash loads a specially-crafted Adobe Flash file. This exploit Adobe Flash file allows remote arbitrary code to execute on the affected system, allowing remote malicious users to deliver and execute payload on the affected system.

Affected versions of the Adobe Flash are:

  • Adobe Flash Player 16.0.0.287 and earlier versions for Windows and Macintosh
  • Adobe Flash Player 13.0.0.262 and earlier 13.x versions
  • Adobe Flash Player 11.2.202.438 and earlier versions for Linux

It does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.476.05
FIRST VSAPI PATTERN DATE: 13 Feb 2015
VSAPI OPR PATTERN File: 11.477.00
VSAPI OPR PATTERN Date: 14 Feb 2015

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_NECLU.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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