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PUA.Win32.INSTALLCORE.WFEJLT

April 27, 2019
 ALIASES:

Generic.Downloader.A8 (Quickheal); Downware.InstallCore (VBA32)

 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. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size:

673,560 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

26 Apr 2019

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.

It may be manually installed by a user.

Installation

This Potentially Unwanted Application drops the following files:

  • %User Temp%\ish{random numbers}\css\ie6_main.css
  • %User Temp%\ish{random numbers}\css\main.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\browse.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\button.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\checkbox.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\progress-bar.css
  • %User Temp%\ish{random numbers}\csshover3.htc
  • %User Temp%\ish{random numbers}\form.bmp.Mask
  • %User Temp%\ish{random numbers}\images\BG.png
  • %User Temp%\ish{random numbers}\images\Close.png
  • %User Temp%\ish{random numbers}\images\Close_Hover.png
  • %User Temp%\ish{random numbers}\images\Color_Button.png
  • %User Temp%\ish{random numbers}\images\Color_Button_Hover.png
  • %User Temp%\ish{random numbers}\images\Grey_Button.png
  • %User Temp%\ish{random numbers}\images\Grey_Button_Hover.png
  • %User Temp%\ish{random numbers}\images\Icon_Generic.png
  • %User Temp%\ish{random numbers}\images\Loader.gif
  • %User Temp%\ish{random numbers}\images\Pause_Button.png
  • %User Temp%\ish{random numbers}\images\Progress.png
  • %User Temp%\ish{random numbers}\images\ProgressBar.png
  • %User Temp%\ish{random numbers}\images\Quick_Specs.png
  • %User Temp%\ish{random numbers}\images\Resume_Button.png
  • %User Temp%\ish{random numbers}\locale\DE.locale
  • %User Temp%\ish{random numbers}\locale\EN.locale
  • %User Temp%\ish{random numbers}\sdk\exceptlist.txt
  • %User Temp%\ish{random numbers}\bootstrap_{random numbers}.html
  • %User Temp%\is{random numbers}\{random numbers}_Setup.ZIP
  • %User Temp%\is{random numbers}\{random numbers}_Setup.ZIP.part
  • %User Profile%\Downloads\db2exc_NT_x86.zip

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.)

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\Soft-Ware

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Soft-Ware
db2exc_NT_x86.zip = {random numbers},http://www.{BLOCKED}are.net/ibm-db2-express/downloads/b/cddeafcd/db2exc_NT_x86.zip

Other Details

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

  • http://os.{BLOCKED}renetcdn.com/Soft-Ware/?v=3.0&c=881318804
  • http://www.{BLOCKED}are.net/ibm-db2-express/downloads/b/cddeafcd/db2exc_NT_x86.zip
  • http://isrg.trustid.ocsp.{BLOCKED}ust.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRv9GhNQxLSSGKBnMArPUcsHYovpgQUxKexpHsscfrb4UuQdf%2FEFWCFiRACEAoBQUIAAAFThXNqC4Xspwg%3D
  • http://az745681.vo.{BLOCKED}d.net/downloadguides/2d046074-e946-4b86-8738-ea747d50fe72/db2exc_NT_x86.exe
  • http://rp.{BLOCKED}renetcdn.com/?pcrc=1216703663

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

2.173.00

SSAPI PATTERN Date:

02 May 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 numbers}\css\ie6_main.css
  • %User Temp%\ish{random numbers}\css\main.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\browse.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\button.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\checkbox.css
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ish{random numbers}\css\sdk-ui\progress-bar.css
  • %User Temp%\ish{random numbers}\csshover3.htc
  • %User Temp%\ish{random numbers}\form.bmp.Mask
  • %User Temp%\ish{random numbers}\images\BG.png
  • %User Temp%\ish{random numbers}\images\Close.png
  • %User Temp%\ish{random numbers}\images\Close_Hover.png
  • %User Temp%\ish{random numbers}\images\Color_Button.png
  • %User Temp%\ish{random numbers}\images\Color_Button_Hover.png
  • %User Temp%\ish{random numbers}\images\Grey_Button.png
  • %User Temp%\ish{random numbers}\images\Grey_Button_Hover.png
  • %User Temp%\ish{random numbers}\images\Icon_Generic.png
  • %User Temp%\ish{random numbers}\images\Loader.gif
  • %User Temp%\ish{random numbers}\images\Pause_Button.png
  • %User Temp%\ish{random numbers}\images\Progress.png
  • %User Temp%\ish{random numbers}\images\ProgressBar.png
  • %User Temp%\ish{random numbers}\images\Quick_Specs.png
  • %User Temp%\ish{random numbers}\images\Resume_Button.png
  • %User Temp%\ish{random numbers}\locale\DE.locale
  • %User Temp%\ish{random numbers}\locale\EN.locale
  • %User Temp%\ish{random numbers}\sdk\exceptlist.txt
  • %User Temp%\ish{random numbers}\bootstrap_{random numbers}.html
  • %User Temp%\is{random numbers}\{random numbers}_Setup.ZIP
  • %User Temp%\is{random numbers}\{random numbers}_Setup.ZIP.part
  • %User Profile%\Downloads\db2exc_NT_x86.zip

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.

  • In HKEY_CURRENT_USER\Software
    • Soft-Ware

Step 5

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.INSTALLCORE.WFEJLT. 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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