PUA.Win32.InstallCore.USMANHOBCL

October 13, 2020
 Analysis by: Thea Patrice Tajonera
 ALIASES:

Adware/DealPly (FORTINET); PUP/DownloadAssistant (PANDA)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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.

  TECHNICAL DETAILS

File Size:

1,180,472 bytes

Memory Resident:

No

Initial Samples Received Date:

23 Sep 2019

Payload:

Connects to URLs/IPs, Displays graphics/image, Deletes files

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%\inH{Random Characters}.log
  • %User Temp%\inH{Random Characters}\css\ie6_main.css
  • %User Temp%\inH{Random Characters}\css\main.css
  • %User Temp%\inH{Random Characters}\css\sdk-ui\browse.css
  • %User Temp%\inH{Random Characters}\css\sdk-ui\button.css
  • %User Temp%\inH{Random Characters}\css\sdk-ui\checkbox.css
  • %User Temp%\inH{Random Characters}\css\sdk-ui\images\button-bg.png
  • %User Temp%\inH{Random Characters}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\inH{Random Characters}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\inH{Random Characters}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\inH{Random Characters}\css\sdk-ui\progress-bar.css
  • %User Temp%\inH{Random Characters}\csshover3.htc
  • %User Temp%\inH{Random Characters}\form.bmp.Mask
  • %User Temp%\inH{Random Characters}\images\BG.png
  • %User Temp%\inH{Random Characters}\images\Close.png
  • %User Temp%\inH{Random Characters}\images\Close_Hover.png
  • %User Temp%\inH{Random Characters}\images\Color_Button.png
  • %User Temp%\inH{Random Characters}\images\Color_Button_Hover.png
  • %User Temp%\inH{Random Characters}\images\Grey_Button.png
  • %User Temp%\inH{Random Characters}\images\Grey_Button_Hover.png
  • %User Temp%\inH{Random Characters}\images\Icon_Generic.png
  • %User Temp%\inH{Random Characters}\images\Loader.gif
  • %User Temp%\inH{Random Characters}\images\Pause_Button.png
  • %User Temp%\inH{Random Characters}\images\Progress.png
  • %User Temp%\inH{Random Characters}\images\ProgressBar.png
  • %User Temp%\inH{Random Characters}\images\Quick_Specs.png
  • %User Temp%\inH{Random Characters}\images\Resume_Button.png
  • %User Temp%\inH{Random Characters}\images\sponsored.png
  • %User Temp%\inH{Random Characters}\locale\EN.locale
  • %User Temp%\inH{Random Characters}\locale\TR.locale
  • %User Temp%\in{Random Characters}\{Random Characters}.tmp
  • %User Temp%\inH{Random Characters}\bootstrap_48971.html
  • %User Temp%\in{Random Characters}\{Random Characters}_stp.dat.tmp
  • %User Temp%\in{Random Characters}\{Random Characters}_stp.dat.part
  • %User Profile%\Downloads\Internet Download Manager.exe
  • %User Temp%\ICReinstall_{File Name}.exe
  • %User Profile%\Desktop\Continue Dosyayi yuklemek icin ileri tusuna basiniz Installation.lnk

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

It adds the following processes:

  • "{File Path}\{File Name}.exe" /_ShowProgress /mnl
  • "{File Path}\{File Name}.exe" /_ShowProgress /PrTxt:TG9hZGluZy4uLg== /mnl
  • %User Profile%\Downloads\Internet Download Manager.exe
  • "%Program Files*\Internet Explorer\iexplore.exe" http://www.indirads.net/git/59
  • "%Program Files*\Internet Explorer\iexplore.exe" SCODEF:376 CREDAT:14337

It creates the following folders:

  • %User Temp%\inH{Random Characters}\css\sdk-ui\images
  • %User Temp%\inH{Random Characters}\css\sdk-ui
  • %User Temp%\inH{Random Characters}\css
  • %User Temp%\inH{Random Characters}\images
  • %User Temp%\inH{Random Characters}\locale
  • %User Temp%\inH{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).)

Other System Modifications

This Potentially Unwanted Application adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings
JITDebug = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = {File Name}.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = 708992537

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\MostRecentApplication
Name = {File Name}.exe

HKEY_CURRENT_USER\Software\Kralprogram
Internet Download Manager.exe = 1602472381320,http://dosya.wboo.net/Dosya%20Kurulum.exe

Download Routine

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

  • http://rp.{BLOCKED}mopa.com/
  • http://os.{BLOCKED}mopa.com/Kralprogram_Y/
  • http://www.{BLOCKED}ds.net/resim/files.jpg
  • http://www.{BLOCKED}ds.net/resim/64px2.png
  • http://dosya.{BLOCKED}o.net/Dosya%20Kurulum.exe
  • http://os2.{BLOCKED}mopa.com/Kralprogram_Y/
  • http://www.{BLOCKED}ds.net/git/59
  • http://info.{BLOCKED}mopa.com/

Other Details

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\MostRecentApplication

HKEY_CURRENT_USER\Software\Kralprogram

It does the following:

  • It displays the following during installation:


It deletes the following files to remove its traces in the system:

  • %User Temp%\{Random Characters}.log
  • %User Temp%\{Random Characters}\bootstrap_48971.html
  • %User Profile%\Desktop\Continue Dosyayi yuklemek icin ileri tusuna basiniz Installation.lnk
  • %User Temp%\ICReinstall_{File Name}.exe
  • %User Temp%\in{Random Characters}\{Random Characters}_stp.dat.part
  • %User Temp%\in{Random Characters}\{Random Characters}_stp.exe
  • %User Temp%\in{Random Characters}\{Random Characters}.tmp
  • %User Temp%\{Random Characters}\css\ie6_main.css
  • %User Temp%\{Random Characters}\css\main.css
  • %User Temp%\{Random Characters}\css\sdk-ui\browse.css
  • %User Temp%\{Random Characters}\css\sdk-ui\button.css
  • %User Temp%\{Random Characters}\css\sdk-ui\checkbox.css
  • %User Temp%\{Random Characters}\css\sdk-ui\images\button-bg.png
  • %User Temp%\{Random Characters}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\{Random Characters}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\{Random Characters}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\{Random Characters}\css\sdk-ui\progress-bar.css
  • %User Temp%\{Random Characters}\csshover3.htc
  • %User Temp%\{Random Characters}\form.bmp.Mask
  • %User Temp%\{Random Characters}\images\BG.png
  • %User Temp%\{Random Characters}\images\Close.png
  • %User Temp%\{Random Characters}\images\Close_Hover.png
  • %User Temp%\{Random Characters}\images\Color_Button.png
  • %User Temp%\{Random Characters}\images\Color_Button_Hover.png
  • %User Temp%\{Random Characters}\images\Grey_Button.png
  • %User Temp%\{Random Characters}\images\Grey_Button_Hover.png
  • %User Temp%\{Random Characters}\images\Icon_Generic.png
  • %User Temp%\{Random Characters}\images\Loader.gif
  • %User Temp%\{Random Characters}\images\Pause_Button.png
  • %User Temp%\{Random Characters}\images\Progress.png
  • %User Temp%\{Random Characters}\images\ProgressBar.png
  • %User Temp%\{Random Characters}\images\Quick_Specs.png
  • %User Temp%\{Random Characters}\images\Resume_Button.png
  • %User Temp%\{Random Characters}\images\sponsored.png
  • %User Temp%\{Random Characters}\locale\EN.locale
  • %User Temp%\{Random Characters}\locale\TR.locale
  • %User Temp%\$inst
  • %User Temp%\in{Random Characters}
  • %User Temp%\inH{Random Characters}\css\sdk-ui\images
  • %User Temp%\inH{Random Characters}\css\sdk-ui
  • %User Temp%\inH{Random Characters}\css
  • %User Temp%\inH{Random Characters}\images
  • %User Temp%\inH{Random Characters}\locale
  • %User Temp%\inH{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).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Minimum Scan Engine:

9.800

SSAPI PATTERN File:

2.217.00

SSAPI PATTERN Date:

26 Sep 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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows Script\Settings
    • JITDebug = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • Name = {File Name}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • ID = 708992537
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\MostRecentApplication
    • Name = {File Name}.exe
  • In HKEY_CURRENT_USER\Software\Kralprogram
    • Internet Download Manager.exe = 1602472381320,http://dosya.wboo.net/Dosya%20Kurulum.exe

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • HKEY_CURRENT_USER\Software\Microsoft\Windows Script
  • HKEY_CURRENT_USER\Software\Microsoft\Windows Script\Settings
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\MostRecentApplication
  • HKEY_CURRENT_USER\Software\Kralprogram

Step 5

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 Profile%\Downloads\Internet Download Manager.exe

Step 6

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