PUA.Win32.InstallCore.MANHOBVL
a variant of Win32/InstallCore.BK.gen potentially unwanted application(NOD32);
Windows

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 connects to certain websites to send and receive information. It redirects browsers to certain sites.
TECHNICAL DETAILS
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%\ish{random numbers}
- %User Temp%\ish{random numbers}\css
- %User Temp%\ish{random numbers}\css\sdk-ui
- %User Temp%\ish{random numbers}\css\sdk-ui\images
- %User Temp%\ish{random numbers}\images
- %User Temp%\ish{random numbers}\locale
- %User Temp%\is{random numbers}
(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%\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}\images\Sponsored-Offer.png
- %User Temp%\ish{random numbers}\locale\DE.locale
- %User Temp%\ish{random numbers}\locale\EN.locale
- %User Temp%\ish{random numbers}\locale\ES.locale
- %User Temp%\ish{random numbers}\locale\FR.locale
- %User Temp%\ish{random numbers}\locale\IT.locale
- %User Temp%\ish{random numbers}\locale\JA.locale
- %User Temp%\ish{random numbers}\locale\NL.locale
- %User Temp%\ish{random numbers}\locale\PL.locale
- %User Temp%\ish{random numbers}\locale\PT.locale
- %User Temp%\ish{random numbers}\locale\RU.locale
- %User Temp%\ish{random numbers}\bootstrap_{random numbers}.html
- %User Temp%\ICReinstall_{Malware Filename}.exe
- %User Temp%\is{random numbers}\{random numbers}_stp.EXE
- %User Temp%\is{random numbers}\{random numbers}_stp.EXE.part
- %Desktop%\Continue Vlc Media Player 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).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop 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 website to send and receive information:
- http://os.{BLOCKED}ritcdn.com/ForumerIT_Adwords/?v=3.0&c=370382921
- http://os2.{BLOCKED}ritcdn.com/ForumerIT_Adwords/?v=3.0&c=370382921
It displays the following images:
It redirects browsers to the following sites:
- https://{BLOCKED}dia-player.jp.{BLOCKED}ad.it/
It accesses the following websites to download its configuration/component files:
- http://{BLOCKED}a.{BLOCKED}n.com/JP/vlc-media-player.exe
SOLUTION
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
- %User Temp%\{random characters}.log
- %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}\images\Sponsored-Offer.png
- %User Temp%\ish{random numbers}\locale\DE.locale
- %User Temp%\ish{random numbers}\locale\EN.locale
- %User Temp%\ish{random numbers}\locale\ES.locale
- %User Temp%\ish{random numbers}\locale\FR.locale
- %User Temp%\ish{random numbers}\locale\IT.locale
- %User Temp%\ish{random numbers}\locale\JA.locale
- %User Temp%\ish{random numbers}\locale\NL.locale
- %User Temp%\ish{random numbers}\locale\PL.locale
- %User Temp%\ish{random numbers}\locale\PT.locale
- %User Temp%\ish{random numbers}\locale\RU.locale
- %User Temp%\ish{random numbers}\bootstrap_{random numbers}.html
- %User Temp%\ICReinstall_{Malware Filename}.exe
- %User Temp%\is{random numbers}\{random numbers}_stp.EXE
- %User Temp%\is{random numbers}\{random numbers}_stp.EXE.part
- %Desktop%\Continue Vlc Media Player Installation.lnk
Step 4
Search and delete this folder
- %User Temp%\ish{random numbers}
- %User Temp%\ish{random numbers}\css
- %User Temp%\ish{random numbers}\css\sdk-ui
- %User Temp%\ish{random numbers}\css\sdk-ui\images
- %User Temp%\ish{random numbers}\images
- %User Temp%\ish{random numbers}\locale
- %User Temp%\is{random numbers}
Step 5
Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.InstallCore.MANHOBVL. 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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