Modified by: Arvin Roi Macaraeg
ALIASES:

PUA/InstallCore.Gen7(ANTIVIR); PUA.InstallCore(IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to a website to send and receive information.

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

  TECHNICAL DETAILS

File Size: 667,880 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 17 Aug 2019
Payload: Drops files, Displays graphics/image, Connects to URLs/IPs

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:

  • %User Temp%\ish{random 6 numbers}\css\ie6_main.css
  • %User Temp%\ish{random 6 numbers}\css\main.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\browse.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\button.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\checkbox.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\progress-bar.css
  • %User Temp%\ish{random 6 numbers}\csshover3.htc
  • %User Temp%\ish{random 6 numbers}\DAT\upd.DAT
  • %User Temp%\ish{random 6 numbers}\images\BG.gif
  • %User Temp%\ish{random 6 numbers}\images\BG_gray.gif
  • %User Temp%\ish{random 6 numbers}\images\Close.png
  • %User Temp%\ish{random 6 numbers}\images\Close_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Close_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\Close_Hover_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button_Hover_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Grey_Button.png
  • %User Temp%\ish{random 6 numbers}\images\Grey_Button_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\icon.png
  • %User Temp%\ish{random 6 numbers}\images\icon_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Loader.gif
  • %User Temp%\ish{random 6 numbers}\images\Progress.png
  • %User Temp%\ish{random 6 numbers}\images\ProgressBar.png
  • %User Temp%\ish{random 6 numbers}\images\ssClose_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\xxClose.png
  • %User Temp%\ish{random 6 numbers}\images\xxProgressBar.png
  • %User Temp%\ish{random 6 numbers}\locale\EN.locale

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Backdoor Routine

This Potentially Unwanted Application connects to the following websites to send and receive information:

  • http://www.{BLOCKED}til.net/?s_token=156{BLOCKED}x=1&{BLOCKED}=1&tdfs=1

Download Routine

This Potentially Unwanted Application accesses the following websites to download files:

  • http://rp.z{BLOCKED}.net/?pcrc=1640844313
  • http://rp.z{BLOCKED}.net/?pcrc=1797158943
  • http://os-test.z{BLOCKED}.net/CM_FL_7/?v=3.0&c=221685344
  • http://cdnus.z{BLOCKED}.net/app/Cmp/openit.cis

Other Details

This Potentially Unwanted Application does the following:

  • It displays the following during installation:

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

  SOLUTION

Minimum Scan Engine: 9.850
SSAPI PATTERN File: 2.205.00
SSAPI PATTERN Date: 08 Aug 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Search and delete this file

[ Learn More ]
There may be some files 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%\ish{random 6 numbers}\css\ie6_main.css
  • %User Temp%\ish{random 6 numbers}\css\main.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\browse.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\button.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\checkbox.css
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ish{random 6 numbers}\css\sdk-ui\progress-bar.css
  • %User Temp%\ish{random 6 numbers}\csshover3.htc
  • %User Temp%\ish{random 6 numbers}\DAT\upd.DAT
  • %User Temp%\ish{random 6 numbers}\images\BG.gif
  • %User Temp%\ish{random 6 numbers}\images\BG_gray.gif
  • %User Temp%\ish{random 6 numbers}\images\Close.png
  • %User Temp%\ish{random 6 numbers}\images\Close_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Close_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\Close_Hover_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\Color_Button_Hover_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Grey_Button.png
  • %User Temp%\ish{random 6 numbers}\images\Grey_Button_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\icon.png
  • %User Temp%\ish{random 6 numbers}\images\icon_gray.png
  • %User Temp%\ish{random 6 numbers}\images\Loader.gif
  • %User Temp%\ish{random 6 numbers}\images\Progress.png
  • %User Temp%\ish{random 6 numbers}\images\ProgressBar.png
  • %User Temp%\ish{random 6 numbers}\images\ssClose_Hover.png
  • %User Temp%\ish{random 6 numbers}\images\xxClose.png
  • %User Temp%\ish{random 6 numbers}\images\xxProgressBar.png
  • %User Temp%\ish{random 6 numbers}\locale\EN.locale

Step 4

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.InstallCore.USMANHOBAP. 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 the following Trend Micro Support pages for more information:


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