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SWF_CVE20155122.A

July 28, 2015
 Analysis by: David John Agni
 ALIASES:

Exp.CVE-2015-5122 (Symantec), SWF/Exploit.Agent.IG (ESET-NOD32)

 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:

Downloaded from the Internet


This malware is related to the campaign that targeted TV and government-related websites in Hong Kong and Taiwan. In the said campaign, attackers used Flash exploits that emerged from the Hacking Team leak to deliver PoisonIvy.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan executes when a user accesses certain websites where it is hosted.

  TECHNICAL DETAILS

File Size:

34898 bytes

File Type:

SWF

Memory Resident:

No

Initial Samples Received Date:

15 Jul 2015

Payload:

Downloads files

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://www.{BLOCKED}c.com.tw/dcalc.exe

Other Details

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

NOTES:
The downloaded file is detected as BKDR_POISON.TUFW.

  SOLUTION

Minimum Scan Engine:

9.750

VSAPI OPR PATTERN File:

11.793.00

VSAPI OPR PATTERN Date:

16 Jul 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove malware/grayware files dropped/downloaded by SWF_CVE20155122.A. (Note: Please skip this step if the threats listed below have already been removed.)

Step 4

Scan your computer with your Trend Micro product to delete files detected as SWF_CVE20155122.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 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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