PUA.Win32.InstallCore.MANHOBYP
Win32/InstallCore.Gen.A potentially unwanted application (NOD32)
Windows
Threat Type: Potentially Unwanted Application
Destructiveness: No
Encrypted: No
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.
As of this writing, the said sites are inaccessible.
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 drops the following files:
- %User Temp%\{Random characters}.log
- %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}\dat\upd.DAT
- %User Temp%\{Random characters}\form.bmp.Mask
- %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\Loader.gif
- %User Temp%\{Random characters}\images\Logo.png
- %User Temp%\{Random characters}\images\Progress.png
- %User Temp%\{Random characters}\images\ProgressBar.png
- %User Temp%\{Random characters}\images\text-bg.png
- %User Temp%\{Random characters}\locale\{Country code}.locale
- %User Temp%\{Random characters}\bootstrap_{Random number}.html
- %Program Files%\{Random characters}.log
- %User Temp%\ICReinstall_{Random characters}.exe
- %User Temp%\{Random characters}\{Random number}_stp.EXE
- %Desktop%\Continue File Opener Installation.lnk
- %User Temp%\{Random characters}\{Random number}_stp.EXE.part
(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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 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).)
Download Routine
This Potentially Unwanted Application accesses the following websites to download files:
- http://s3.{BLOCKED}aws.com/Tweaks/distros/FileOpenerSetupG.exe
As of this writing, the said sites are inaccessible.
Other Details
This Potentially Unwanted Application does the following:
- It connects to the following URL to send and receive information about its installation:
- http://rp.{BLOCKED}it.com/?pcrc={Random generated ID}
- http://os2.{BLOCKED}it.com/Aff-AD/?v={Version of file to be installed}&c={Random generated ID}
- http://os.{BLOCKED}it.com/CM_DS/?v={Version of file to be installed}&c={Random generated ID}
- It visits the following websites after installation. As of this writing, the said sites are inaccessible:
- http://www.{BLOCKED}zip-it.com/file-opener/welcome/ee/?{Parameters}
- It sends the following installation information:
- Generated ID
- Version of file to be installed
- System language
SOLUTION
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.XXPE50FSX014
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
- %User Temp%\{Random characters}.log
- %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}\dat\upd.DAT
- %User Temp%\{Random characters}\form.bmp.Mask
- %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\Loader.gif
- %User Temp%\{Random characters}\images\Logo.png
- %User Temp%\{Random characters}\images\Progress.png
- %User Temp%\{Random characters}\images\ProgressBar.png
- %User Temp%\{Random characters}\images\text-bg.png
- %User Temp%\{Random characters}\locale\{Country code}.locale
- %User Temp%\{Random characters}\bootstrap_{Random number}.html
- %Program Files%\{Random characters}.log
- %User Temp%\ICReinstall_{Random characters}.exe
- %User Temp%\{Random characters}\{Random number}_stp.EXE
- %Desktop%\Continue File Opener Installation.lnk
- %User Temp%\{Random characters}\{Random number}_stp.EXE.part
Step 5
Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.InstallCore.MANHOBYP. 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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