PUA_INSTALLCORE_BK082C13_TOMC

March 01, 2017
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

561,502 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

01 Mar 2017

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.

Installation

This Trojan creates the following folders:

  • %User Temp%\ish93906
  • %User Temp%\ish93906\css
  • %User Temp%\ish93906\css\sdk-ui
  • %User Temp%\ish93906\css\sdk-ui\images
  • %User Temp%\ish93906\defaultOffer
  • %User Temp%\ish93906\defaultOffer\US
  • %User Temp%\ish93906\images
  • %User Temp%\ish93906\locale
  • %User Temp%\is415804647

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\00016ED2.log
  • %User Temp%\ish93906\blank.gif
  • %User Temp%\ish93906\css\buttons.css
  • %User Temp%\ish93906\css\ie6_main.css
  • %User Temp%\ish93906\css\main.css
  • %User Temp%\ish93906\css\sdk-ui\browse.css
  • %User Temp%\ish93906\css\sdk-ui\button.css
  • %User Temp%\ish93906\css\sdk-ui\checkbox.css
  • %User Temp%\ish93906\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish93906\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish93906\css\sdk-ui\progress-bar.css
  • %User Temp%\ish93906\defaultOffer\offer_code.dat
  • %User Temp%\ish93906\defaultOffer\offer_html.dat
  • %User Temp%\ish93906\defaultOffer\US\offer_code.dat
  • %User Temp%\ish93906\defaultOffer\US\offer_html.dat
  • %User Temp%\ish93906\images\back-button.png
  • %User Temp%\ish93906\images\Bg.jpg
  • %User Temp%\ish93906\images\close_button.png
  • %User Temp%\ish93906\images\finish-button.png
  • %User Temp%\ish93906\images\finish_button.jpg
  • %User Temp%\ish93906\images\icon.png
  • %User Temp%\ish93906\images\loader.gif
  • %User Temp%\ish93906\images\next-button-over.png
  • %User Temp%\ish93906\images\next-button.png
  • %User Temp%\ish93906\images\progress-bg.png
  • %User Temp%\ish93906\images\skip-button.png
  • %User Temp%\ish93906\images\Software.png
  • %User Temp%\ish93906\license.txt
  • %User Temp%\ish93906\locale\EN.locale
  • %User Temp%\ish93906\bootstrap_38870.html
  • %Program Files%\is98734.log
  • %User Temp%\000181FC.log
  • %User Temp%\icreinstall_{malware file name}
  • %Desktop%\Continue FoxTab Video Converter Installation.lnk
  • %User Temp%\00018A49.log
  • %User Temp%\is415804647\182292433.cfg
  • %User Temp%\is415804647\1353966337.cfg
  • %User Temp%\is415804647\46990_Setup.CIS

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://os.{BLOCKED}ile.com
  • http://os.{BLOCKED}ile.com/Prod/VideoConverter-v2.cis
  • http://cdneu.{BLOCKED}ile.com/Prod/VideoConverter-v2.cis

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\00016ED2.log
  • %User Temp%\ish93906\blank.gif
  • %User Temp%\ish93906\css\buttons.css
  • %User Temp%\ish93906\css\ie6_main.css
  • %User Temp%\ish93906\css\main.css
  • %User Temp%\ish93906\css\sdk-ui\browse.css
  • %User Temp%\ish93906\css\sdk-ui\button.css
  • %User Temp%\ish93906\css\sdk-ui\checkbox.css
  • %User Temp%\ish93906\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish93906\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish93906\css\sdk-ui\progress-bar.css
  • %User Temp%\ish93906\defaultOffer\offer_code.dat
  • %User Temp%\ish93906\defaultOffer\offer_html.dat
  • %User Temp%\ish93906\defaultOffer\US\offer_code.dat
  • %User Temp%\ish93906\defaultOffer\US\offer_html.dat
  • %User Temp%\ish93906\images\back-button.png
  • %User Temp%\ish93906\images\Bg.jpg
  • %User Temp%\ish93906\images\close_button.png
  • %User Temp%\ish93906\images\finish-button.png
  • %User Temp%\ish93906\images\finish_button.jpg
  • %User Temp%\ish93906\images\icon.png
  • %User Temp%\ish93906\images\loader.gif
  • %User Temp%\ish93906\images\next-button-over.png
  • %User Temp%\ish93906\images\next-button.png
  • %User Temp%\ish93906\images\progress-bg.png
  • %User Temp%\ish93906\images\skip-button.png
  • %User Temp%\ish93906\images\Software.png
  • %User Temp%\ish93906\license.txt
  • %User Temp%\ish93906\locale\EN.locale
  • %User Temp%\ish93906\bootstrap_38870.html
  • %Program Files%\is98734.log
  • %User Temp%\000181FC.log
  • %User Temp%\icreinstall_{malware file name}
  • %Desktop%\Continue FoxTab Video Converter Installation.lnk
  • %User Temp%\00018A49.log
  • %User Temp%\is415804647\182292433.cfg
  • %User Temp%\is415804647\1353966337.cfg
  • %User Temp%\is415804647\46990_Setup.CIS

Step 3

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\ish93906
  • %User Temp%\ish93906\css
  • %User Temp%\ish93906\css\sdk-ui
  • %User Temp%\ish93906\css\sdk-ui\images
  • %User Temp%\ish93906\defaultOffer
  • %User Temp%\ish93906\defaultOffer\US
  • %User Temp%\ish93906\images
  • %User Temp%\ish93906\locale
  • %User Temp%\is415804647

Step 4

Scan your computer with your Trend Micro product to delete files detected as PUA_INSTALLCORE_BK082C13_TOMC. 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.


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