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SWF_EXPLOYT.YYKM

July 30, 2015
 Analysis by: RonJay Kristoffer Caragay
 ALIASES:

Exploit:SWF/CVE-2015-5122 (Microsoft); CVE155122 (F-Prot); Exploit:SWF/Salama.T (F-Secure); Exploit.SWF.Agent.ln (Kaspersky); SWF/Exploit.DE (AVG)

 PLATFORM:

Windows, Mac OS

 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 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. However, as of this writing, the said sites are inaccessible.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

85,054 bytes

File Type:

SWF

Memory Resident:

No

Initial Samples Received Date:

27 Jul 2015

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.

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

It may be downloaded from the following remote site(s):

  • http://www.{BLOCKED}rat.com/info/news/movie.swf

However, as of this writing, the said sites are inaccessible.

Dropping Routine

This Trojan takes advantage of the following software vulnerabilities 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.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

It checks if it is running in the following OS versions and platforms:

  • Windows OS 32-bit/64-bit
  • Mac OS 32-bit/64-bit

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.804.03

FIRST VSAPI PATTERN DATE:

21 Jul 2015

VSAPI OPR PATTERN File:

11.804.03

VSAPI OPR PATTERN Date:

22 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

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as SWF_EXPLOYT.YYKM. 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 these security patches 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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