PUA.Win32.InstallCore.USMANHOBLH

March 05, 2020
 Analysis by: Mohammed Malubay
 ALIASES:

Win32/InstallCore.Gen.A potentially unwanted application(NOD32); HEUR:AdWare.Win32.Vosteran.heur(KASPERSKY); Adware.InstallCore.A8(QUICKHEAL);

 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

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.

  TECHNICAL DETAILS

File Size:

1,024,704 bytes

File Type:

EXE

Initial Samples Received Date:

04 Mar 2020

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 adds the following folders:

  • %User Temp%\inH{random numbers}
  • %User Temp%\inH{random numbers}\css
  • %User Temp%\inH{random numbers}\css\sdk-ui
  • %User Temp%\inH{random numbers}\css\sdk-ui\images
  • %User Temp%\inH{random numbers}\images
  • %User Temp%\inH{random numbers}\locale
  • %User Temp%\in{random characters}

(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).)

It drops the following files:

  • %User Temp%\{random characters}.log
  • %User Temp%\{random characters}.dat
  • %User Temp%\in{random characters}\{random characters}.tmp
  • %User Temp%\inH{random numbers}\bootstrap_43952.html
  • %User Temp%\inH{random numbers}\css\ie6_main.css
  • %User Temp%\inH{random numbers}\css\main.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\browse.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\button.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\checkbox.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\button-bg.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\progress-bar.css
  • %User Temp%\inH{random numbers}\csshover3.htc
  • %User Temp%\inH{random numbers}\fciv.exe
  • %User Temp%\inH{random numbers}\form.bmp.Mask
  • %User Temp%\inH{random numbers}\images\BG.png
  • %User Temp%\inH{random numbers}\images\Close.png
  • %User Temp%\inH{random numbers}\images\Close_Hover.png
  • %User Temp%\inH{random numbers}\images\Color_Button.png
  • %User Temp%\inH{random numbers}\images\Color_Button_Hover.png
  • %User Temp%\inH{random numbers}\images\Grey_Button.png
  • %User Temp%\inH{random numbers}\images\Grey_Button_Hover.png
  • %User Temp%\inH{random numbers}\images\Icon_Generic.png
  • %User Temp%\inH{random numbers}\images\Loader.gif
  • %User Temp%\inH{random numbers}\images\Pause_Button.png
  • %User Temp%\inH{random numbers}\images\Progress.png
  • %User Temp%\inH{random numbers}\images\ProgressBar.png
  • %User Temp%\inH{random numbers}\images\Quick_Specs.png
  • %User Temp%\inH{random numbers}\images\Resume_Button.png
  • %User Temp%\inH{random numbers}\images\sponsored.png
  • %User Temp%\inH{random numbers}\images\step01.png
  • %User Temp%\inH{random numbers}\images\step02.png
  • %User Temp%\inH{random numbers}\images\step03.png
  • %User Temp%\inH{random numbers}\images\step04.png
  • %User Temp%\inH{random numbers}\locale\DE.locale
  • %User Temp%\inH{random numbers}\locale\EN.locale
  • %User Temp%\inH{random numbers}\locale\ES.locale
  • %User Temp%\inH{random numbers}\locale\FR.locale
  • %User Temp%\inH{random numbers}\locale\JA.locale
  • %User Temp%\inH{random numbers}\locale\PL.locale
  • %User Temp%\inH{random numbers}\locale\PT.locale
  • %User Temp%\inH{random numbers}\locale\RU.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).)

It adds the following processes:

  • /d /c TIMEOUT 1 & cmd /d /c copy /B /Y "%User Temp%\{random characters}.dat"
  • cmd /d /c copy /B /Y "%User Temp%\inH{random numbers}\fciv.exe"
  • cmd /d /c del "%User Temp%\{random characters}.dat"
  • "{execution file path}\{original filename}.exe" /_ShowProgress /PrTxt:TG9hZGluZy4uLg==

(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).)

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

  • http://info.{BLOCKED}forgecdn.com/?v=1.03&c=d43f385c&at=386526232&cntr=0
  • http://info.{BLOCKED}forgecdn.com/?v=1.03&c=d43f385c&at=386526232&cntr=1
  • http://info.{BLOCKED}forgecdn.com/?v=1.03&c=d43f385c&at=386526232&cntr=2
  • http://rp.{BLOCKED}forgecdn.com/?pcrc=1496164721&v=2.0
  • http://rp.{BLOCKED}forgecdn.com/?pcrc=170400431&v=2.0
  • http://rp.{BLOCKED}forgecdn.com/?pcrc=1746815800&v=2.0
  • http://rp.{BLOCKED}forgecdn.com/?pcrc=854710356&v=2.0

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

2.267.00

SSAPI PATTERN Date:

12 Mar 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     Troj.Win32.TRX.XXPE50FFF034

Step 2

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 3

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 4

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%\{random characters}.log
  • %User Temp%\{random characters}.dat
  • %User Temp%\in{random characters}\{random characters}.tmp
  • %User Temp%\inH{random numbers}\bootstrap_43952.html
  • %User Temp%\inH{random numbers}\css\ie6_main.css
  • %User Temp%\inH{random numbers}\css\main.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\browse.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\button.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\checkbox.css
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\button-bg.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\inH{random numbers}\css\sdk-ui\progress-bar.css
  • %User Temp%\inH{random numbers}\csshover3.htc
  • %User Temp%\inH{random numbers}\fciv.exe
  • %User Temp%\inH{random numbers}\form.bmp.Mask
  • %User Temp%\inH{random numbers}\images\BG.png
  • %User Temp%\inH{random numbers}\images\Close.png
  • %User Temp%\inH{random numbers}\images\Close_Hover.png
  • %User Temp%\inH{random numbers}\images\Color_Button.png
  • %User Temp%\inH{random numbers}\images\Color_Button_Hover.png
  • %User Temp%\inH{random numbers}\images\Grey_Button.png
  • %User Temp%\inH{random numbers}\images\Grey_Button_Hover.png
  • %User Temp%\inH{random numbers}\images\Icon_Generic.png
  • %User Temp%\inH{random numbers}\images\Loader.gif
  • %User Temp%\inH{random numbers}\images\Pause_Button.png
  • %User Temp%\inH{random numbers}\images\Progress.png
  • %User Temp%\inH{random numbers}\images\ProgressBar.png
  • %User Temp%\inH{random numbers}\images\Quick_Specs.png
  • %User Temp%\inH{random numbers}\images\Resume_Button.png
  • %User Temp%\inH{random numbers}\images\sponsored.png
  • %User Temp%\inH{random numbers}\images\step01.png
  • %User Temp%\inH{random numbers}\images\step02.png
  • %User Temp%\inH{random numbers}\images\step03.png
  • %User Temp%\inH{random numbers}\images\step04.png
  • %User Temp%\inH{random numbers}\locale\DE.locale
  • %User Temp%\inH{random numbers}\locale\EN.locale
  • %User Temp%\inH{random numbers}\locale\ES.locale
  • %User Temp%\inH{random numbers}\locale\FR.locale
  • %User Temp%\inH{random numbers}\locale\JA.locale
  • %User Temp%\inH{random numbers}\locale\PL.locale
  • %User Temp%\inH{random numbers}\locale\PT.locale
  • %User Temp%\inH{random numbers}\locale\RU.locale

Step 5

Search and delete this folder

[ 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%\inH{random numbers}
  • %User Temp%\inH{random numbers}\css
  • %User Temp%\inH{random numbers}\css\sdk-ui
  • %User Temp%\inH{random numbers}\css\sdk-ui\images
  • %User Temp%\inH{random numbers}\images
  • %User Temp%\inH{random numbers}\locale
  • %User Temp%\in{random characters}

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.InstallCore.USMANHOBLH. 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:


Did this description help? Tell us how we did.