PUA.Win32.InstallCore.USMANHOBKC

February 20, 2020

Analysis by: Mohammed Malubay

ALIASES:

PUP/InstallCore(PANDA); Mal/EncPk-NST(SOPHOS_LITE); Application.InstallCore.IB(BITDEFENDER);

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: 3,053,872 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 19 Feb 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\helpers
%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}\libs
%User Temp%\inH{random numbers}\libs\localAssests
%User Temp%\inH{random numbers}\libs\localAssests\icc
%User Temp%\inH{random numbers}\libs\localAssests\icut
%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%\inH{random numbers}\bootstrap_40707.html
%User Temp%\inH{random numbers}\css\_functions.scss
%User Temp%\inH{random numbers}\css\_helpers.scss
%User Temp%\inH{random numbers}\css\_variables.scss
%User Temp%\inH{random numbers}\css\helpers\_align.scss
%User Temp%\inH{random numbers}\css\helpers\_backgrounds.scss
%User Temp%\inH{random numbers}\css\helpers\_border-radius.scss
%User Temp%\inH{random numbers}\css\helpers\_border.scss
%User Temp%\inH{random numbers}\css\helpers\_clearfix.scss
%User Temp%\inH{random numbers}\css\helpers\_colors.scss
%User Temp%\inH{random numbers}\css\helpers\_display.scss
%User Temp%\inH{random numbers}\css\helpers\_float.scss
%User Temp%\inH{random numbers}\css\helpers\_lists.scss
%User Temp%\inH{random numbers}\css\helpers\_margin.scss
%User Temp%\inH{random numbers}\css\helpers\_padding.scss
%User Temp%\inH{random numbers}\css\helpers\_positions.scss
%User Temp%\inH{random numbers}\css\helpers\_typography.scss
%User Temp%\inH{random numbers}\css\helpers\_visibility.scss
%User Temp%\inH{random numbers}\css\helpers\_width-height.scss
%User Temp%\inH{random numbers}\css\helpers\_z-index.scss
%User Temp%\inH{random numbers}\css\ie6_main.css
%User Temp%\inH{random numbers}\css\ie6_main.scss
%User Temp%\inH{random numbers}\css\main.css
%User Temp%\inH{random numbers}\css\main.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_browse.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_button.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_checkbox.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_progress-bar.scss
%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\swAgent.css
%User Temp%\inH{random numbers}\csshover3.htc
%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}\libeay32.dll
%User Temp%\inH{random numbers}\libs\localAssests\icc\icc_v5_8.cis
%User Temp%\inH{random numbers}\libs\localAssests\icut\icut_v2_2.cis
%User Temp%\inH{random numbers}\locale\DE.locale
%User Temp%\inH{random numbers}\locale\EN.locale
%User Temp%\inH{random numbers}\locale\FR.locale
%User Temp%\inH{random numbers}\locale\JA.locale
%User Temp%\inH{random numbers}\locale\ZH.locale
%User Temp%\inH{random numbers}\ssleay32.dll
%User Temp%\in{random characters}\{random characters}.tmp
%User Temp%\{random characters}.log

It adds the following processes:

"{execution file path}\{original file name}.exe" /_ShowProgress /mnl

NOTES:

The PUA displays the following windows:

SOLUTION

Minimum Scan Engine: 9.850

SSAPI PATTERN File: 2.262.00

SSAPI PATTERN Date: 20 Feb 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.XXPE50FFF033

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%\inH{random numbers}\bootstrap_40707.html
%User Temp%\inH{random numbers}\css\_functions.scss
%User Temp%\inH{random numbers}\css\_helpers.scss
%User Temp%\inH{random numbers}\css\_variables.scss
%User Temp%\inH{random numbers}\css\helpers\_align.scss
%User Temp%\inH{random numbers}\css\helpers\_backgrounds.scss
%User Temp%\inH{random numbers}\css\helpers\_border-radius.scss
%User Temp%\inH{random numbers}\css\helpers\_border.scss
%User Temp%\inH{random numbers}\css\helpers\_clearfix.scss
%User Temp%\inH{random numbers}\css\helpers\_colors.scss
%User Temp%\inH{random numbers}\css\helpers\_display.scss
%User Temp%\inH{random numbers}\css\helpers\_float.scss
%User Temp%\inH{random numbers}\css\helpers\_lists.scss
%User Temp%\inH{random numbers}\css\helpers\_margin.scss
%User Temp%\inH{random numbers}\css\helpers\_padding.scss
%User Temp%\inH{random numbers}\css\helpers\_positions.scss
%User Temp%\inH{random numbers}\css\helpers\_typography.scss
%User Temp%\inH{random numbers}\css\helpers\_visibility.scss
%User Temp%\inH{random numbers}\css\helpers\_width-height.scss
%User Temp%\inH{random numbers}\css\helpers\_z-index.scss
%User Temp%\inH{random numbers}\css\ie6_main.css
%User Temp%\inH{random numbers}\css\ie6_main.scss
%User Temp%\inH{random numbers}\css\main.css
%User Temp%\inH{random numbers}\css\main.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_browse.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_button.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_checkbox.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_progress-bar.scss
%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\swAgent.css
%User Temp%\inH{random numbers}\csshover3.htc
%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}\libeay32.dll
%User Temp%\inH{random numbers}\libs\localAssests\icc\icc_v5_8.cis
%User Temp%\inH{random numbers}\libs\localAssests\icut\icut_v2_2.cis
%User Temp%\inH{random numbers}\locale\DE.locale
%User Temp%\inH{random numbers}\locale\EN.locale
%User Temp%\inH{random numbers}\locale\FR.locale
%User Temp%\inH{random numbers}\locale\JA.locale
%User Temp%\inH{random numbers}\locale\ZH.locale
%User Temp%\inH{random numbers}\ssleay32.dll
%User Temp%\in{random characters}\{random characters}.tmp
%User Temp%\{random characters}.log

To manually delete a malware/grayware file from an affected system:

•For Windows 7, Windows Server 2008 (R2), Windows 8, Windows 8.1, Windows 10, and Windows Server 2012 (R2):

Open a Windows Explorer window.
- For Windows 7 and Server 2008 (R2) users, click Start>Computer.
- For Windows 8, 8.1, 10, and Server 2012 (R2) users, right-click on the lower-left corner of the screen,then click File Explorer.
In the Search Computer/This PC input box, type:
%User Temp%\inH{random numbers}\bootstrap_40707.html
%User Temp%\inH{random numbers}\css\_functions.scss
%User Temp%\inH{random numbers}\css\_helpers.scss
%User Temp%\inH{random numbers}\css\_variables.scss
%User Temp%\inH{random numbers}\css\helpers\_align.scss
%User Temp%\inH{random numbers}\css\helpers\_backgrounds.scss
%User Temp%\inH{random numbers}\css\helpers\_border-radius.scss
%User Temp%\inH{random numbers}\css\helpers\_border.scss
%User Temp%\inH{random numbers}\css\helpers\_clearfix.scss
%User Temp%\inH{random numbers}\css\helpers\_colors.scss
%User Temp%\inH{random numbers}\css\helpers\_display.scss
%User Temp%\inH{random numbers}\css\helpers\_float.scss
%User Temp%\inH{random numbers}\css\helpers\_lists.scss
%User Temp%\inH{random numbers}\css\helpers\_margin.scss
%User Temp%\inH{random numbers}\css\helpers\_padding.scss
%User Temp%\inH{random numbers}\css\helpers\_positions.scss
%User Temp%\inH{random numbers}\css\helpers\_typography.scss
%User Temp%\inH{random numbers}\css\helpers\_visibility.scss
%User Temp%\inH{random numbers}\css\helpers\_width-height.scss
%User Temp%\inH{random numbers}\css\helpers\_z-index.scss
%User Temp%\inH{random numbers}\css\ie6_main.css
%User Temp%\inH{random numbers}\css\ie6_main.scss
%User Temp%\inH{random numbers}\css\main.css
%User Temp%\inH{random numbers}\css\main.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_browse.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_button.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_checkbox.scss
%User Temp%\inH{random numbers}\css\sdk-ui\_progress-bar.scss
%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\swAgent.css
%User Temp%\inH{random numbers}\csshover3.htc
%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}\libeay32.dll
%User Temp%\inH{random numbers}\libs\localAssests\icc\icc_v5_8.cis
%User Temp%\inH{random numbers}\libs\localAssests\icut\icut_v2_2.cis
%User Temp%\inH{random numbers}\locale\DE.locale
%User Temp%\inH{random numbers}\locale\EN.locale
%User Temp%\inH{random numbers}\locale\FR.locale
%User Temp%\inH{random numbers}\locale\JA.locale
%User Temp%\inH{random numbers}\locale\ZH.locale
%User Temp%\inH{random numbers}\ssleay32.dll
%User Temp%\in{random characters}\{random characters}.tmp
%User Temp%\{random characters}.log
Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7 and Windows Server 2008 (R2).

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\helpers
%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}\libs
%User Temp%\inH{random numbers}\libs\localAssests
%User Temp%\inH{random numbers}\libs\localAssests\icc
%User Temp%\inH{random numbers}\libs\localAssests\icut
%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.USMANHOBKC. 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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PUA.Win32.InstallCore.USMANHOBKC

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