Analysis by: RonJay Kristoffer Caragay
ALIASES:

Exploit:HTML/CVE-2013-3918.A (F-Secure); JS/Kryptik.ARX trojan (NOD32)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as a component bundled with malware/grayware packages. It may be hosted on a website and run when a user accesses the said website.

It requires its main component to successfully perform its intended routine. It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size: 16,499 bytes
File Type: HTML, HTM
Memory Resident: No
Initial Samples Received Date: 12 Aug 2014

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

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

Other Details

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

It requires the existence of the following files to properly run:

  • lspinq/d390f.js
  • lspinq/57ee0.js

More information on this vulnerability can be found below:

It takes advantage of the following vulnerabilities:

NOTES:

It creates an iframe or redirects to certain URLs depending on the parameter it receives.

It may redirect to the following URL:

  • {malware’s host}/{malware’s URL path}/nhopee.php

The iframe consists any of the following URLs that is appended to the current URL:

  • {malware's host}/{malware's URL path}/bgamesn.php
  • {malware's host}/{malware's URL path}/sboheld php - detected also as PHP_EXPLOYT.GES
  • {malware's host}/{malware's URL path}/kbadq.php
  • {malware's host}/{malware's URL path}/ssaidu.php
  • {malware's host}/{malware's URL path}/ibattestinj.php
  • {malware's host}/{malware's URL path}/stensiond.php
  • {malware's host}/{malware's URL path}/qaheadk.php
  • {malware's host}/{malware's URL path}/dcontrollingk.php
  • {malware's host}/{malware's URL path}/jmoralm.php

{malware’s host}/{malware’s URL path}/sboheld.php uses the said exploit to execute arbitrary code depending on the existing object in the host site.

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

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.980.03
FIRST VSAPI PATTERN DATE: 12 Aug 2014
VSAPI OPR PATTERN File: 10.981.00
VSAPI OPR PATTERN Date: 12 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

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 PHP_EXPLOYT.GES. 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.  


Did this description help? Tell us how we did.