Analysis by: Arvin Roi Macaraeg

ALIASES:

Win32/OpenCandy Potentially Unsafe(ESET-NOD32); HEUR:AdWare.Win32.OpenCandy.gen(KASPERSKY)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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: 2,197,344 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 11 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%\nsu{random characters}.tmp\System.dll
  • %User Temp%\nsu{random characters}.tmp\LangDLL.dll
  • %User Temp%\nsu{random characters}.tmp\OCSetupHlp.dll
  • %Program Files%\MediaInfo\MediaInfo.exe
  • %Program Files%\MediaInfo\MediaInfo_InfoTip.dll
  • %Program Files%\MediaInfo\MediaInfo.dll
  • %Program Files%\MediaInfo\History.txt
  • %Program Files%\MediaInfo\License.html
  • %Program Files%\MediaInfo\ReadMe.txt
  • %Program Files%\MediaInfo\Plugin\Custom\Example.csv
  • %Program Files%\MediaInfo\Plugin\Custom\Example_HTML.csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by fields, compact (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by fields, short (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by fields, standard (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by fields, verbose (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by streams, compact (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by streams, short (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by streams, standard (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\Table by streams, verbose (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Custom\XML.csv
  • %Program Files%\MediaInfo\Plugin\Custom\en.Example.csv
  • %Program Files%\MediaInfo\Plugin\Custom\en.Example_HTML.csv
  • %Program Files%\MediaInfo\Plugin\Custom\fr.Example.csv
  • %Program Files%\MediaInfo\Plugin\Custom\it.Esempio.csv
  • %Program Files%\MediaInfo\Plugin\Custom\it.Esempio_HTML.csv
  • %Program Files%\MediaInfo\Plugin\Custom\zzz_Contrib - Dusil (HTML).csv
  • %Program Files%\MediaInfo\Plugin\Language\ar.csv
  • %Program Files%\MediaInfo\Plugin\Language\be.csv
  • %Program Files%\MediaInfo\Plugin\Language\bg.csv
  • %Program Files%\MediaInfo\Plugin\Language\ca.csv
  • %Program Files%\MediaInfo\Plugin\Language\cs.csv
  • %Program Files%\MediaInfo\Plugin\Language\da.csv
  • %Program Files%\MediaInfo\Plugin\Language\de.csv
  • %Program Files%\MediaInfo\Plugin\Language\en.csv
  • %Program Files%\MediaInfo\Plugin\Language\es.csv
  • %Program Files%\MediaInfo\Plugin\Language\fa.csv
  • %Program Files%\MediaInfo\Plugin\Language\fr.csv
  • %Program Files%\MediaInfo\Plugin\Language\gl.csv
  • %Program Files%\MediaInfo\Plugin\Language\gr.csv
  • %Program Files%\MediaInfo\Plugin\Language\hr.csv
  • %Program Files%\MediaInfo\Plugin\Language\hu.csv
  • %Program Files%\MediaInfo\Plugin\Language\it.csv
  • %Program Files%\MediaInfo\Plugin\Language\ja.csv
  • %Program Files%\MediaInfo\Plugin\Language\ko.csv
  • %Program Files%\MediaInfo\Plugin\Language\lt.csv
  • %Program Files%\MediaInfo\Plugin\Language\nl.csv
  • %Program Files%\MediaInfo\Plugin\Language\pl.csv
  • %Program Files%\MediaInfo\Plugin\Language\pt-BR.csv
  • %Program Files%\MediaInfo\Plugin\Language\pt.csv
  • %Program Files%\MediaInfo\Plugin\Language\ro.csv
  • %Program Files%\MediaInfo\Plugin\Language\ru.csv
  • %Program Files%\MediaInfo\Plugin\Language\sk.csv
  • %Program Files%\MediaInfo\Plugin\Language\sq.csv
  • %Program Files%\MediaInfo\Plugin\Language\sv.csv
  • %Program Files%\MediaInfo\Plugin\Language\th.csv
  • %Program Files%\MediaInfo\Plugin\Language\tr.csv
  • %Program Files%\MediaInfo\Plugin\Language\uk.csv
  • %Program Files%\MediaInfo\Plugin\Language\zh-CN.csv
  • %Program Files%\MediaInfo\Plugin\Language\zh-TW.csv
  • %Program Files%\MediaInfo\Plugin\Sheet\Example.csv
  • %Program Files%\MediaInfo\Plugin\Sheet\Export example.csv
  • %Program Files%\MediaInfo\MediaInfo.url
  • %Programs%\MediaInfo\Website.lnk
  • %Programs%\MediaInfo\Uninstall.lnk
  • %Programs%\MediaInfo\History.lnk
  • %Program Files%\MediaInfo\uninst.exe

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).. %Programs% is the folder that contains the user’s program groups, which is usually C:\Windows\Start Menu\Programs or C:\Documents and Settings\{User name}\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.)

It adds the following processes:

  • regsvr32 "%Program Files%\MediaInfo\MediaInfo_InfoTip.dll" /s

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

Other System Modifications

This Potentially Unwanted Application adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
DisplayName = "MediaInfo 0.7.37"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
Publisher = "MediaArea.net"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
UninstallString = "%Program Files%\MediaInfo\uninst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
DisplayIcon = "%Program Files%\MediaInfo\MediaInfo.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
DisplayVersion = "0.7.37"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
URLInfoAbout = "http://med{BLOCKED}orge.net"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MediaInfo
NSIS:Language = "1033"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager
PendingFileRenameOperations = "\??\%User Temp%\nsu{random characters}.tmp\LangDLL.dll, , \??\%User Temp%\nsu{random characters}.tmp\, "

Other Details

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

  • http://med{BLOCKED}orge.net

  SOLUTION

Minimum Scan Engine: 9.850
SSAPI PATTERN File: 2.167.00
SSAPI PATTERN Date: 18 Apr 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

Remove PUA.Win32.OpenCandy.GN by using its own Uninstall option

[ Learn More ]
To uninstall the grayware process

Step 4

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.OpenCandy.GN. 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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