Analysis by: Jeanne Jocson
ALIASES:

Adware.CornerSunshine (Symantec)

 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: Dropped by other malware, 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. It may be manually installed by a user.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 1,755,896 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 01 Nov 2016
Payload: Connects to URLs/IPs, Displays graphics/image

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 creates the following folders:

  • %Program Files%\Corner Sunshine\res
  • %Program Files%\Corner Sunshine\res\picture
  • %Program Files%\Corner Sunshine\res\picture\uninstall
  • %Program Files%\Corner Sunshine\res\CN
  • %Program Files%\Corner Sunshine\res\DE
  • %Program Files%\Corner Sunshine\res\EN
  • %Program Files%\Corner Sunshine\res\FR

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Autostart Technique

This potentially unwanted application adds and runs the following services:

  • CornerSunshineSvc

Other System Modifications

This potentially unwanted application adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
Corner Sunshine

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine

HKEY_LOCAL_MACHINE\SOFTWARE\Corner Sunshine

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine
DisplayName = "Corner Sunshine"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine
DisplayIcon = "%Program Files%\Corner Sunshine\CornerSunshineInst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine
UninstallString = "%Program Files%\Corner Sunshine\CornerSunshineInst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine
ProductVersion = "1.0.2"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine
InstallLocation = "%Program Files%\Corner Sunshine"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Corner Sunshine
DisplayVersion = "1.0.2"

HKEY_LOCAL_MACHINE\SOFTWARE\Corner Sunshine
path = "%Program Files%\Corner Sunshine\"

HKEY_LOCAL_MACHINE\SOFTWARE\Corner Sunshine
channel = "official"

HKEY_LOCAL_MACHINE\SOFTWARE\Corner Sunshine
guid = "{GUID}"

HKEY_LOCAL_MACHINE\SOFTWARE\Corner Sunshine
wheref = "from-self"

HKEY_LOCAL_MACHINE\SOFTWARE\Corner Sunshine
InstTime = "{install time}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
Description = "The CornerSunshine service that aims to offer weather forcast "

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
DisplayName = "CornerSunshineSvc"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
FailureActions = "{hex values}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
ImagePath = ""%Program Files%\Corner Sunshine\CornerSunshineSvc.exe" {UID}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
Start = "2" (SERVICE_AUTO_START)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\CornerSunshineSvc
Type = "272"

Dropping Routine

This potentially unwanted application drops the following files:

  • %Program Files%\Corner Sunshine\CornerSunshine.exe
  • %Program Files%\Corner Sunshine\CornerSunshineDll.dll
  • %Program Files%\Corner Sunshine\CornerSunshineInst.exe
  • %Program Files%\Corner Sunshine\CornerSunshineSvc.exe
  • %Program Files%\Corner Sunshine\main
  • %Program Files%\Corner Sunshine\res\CN\city_list_item.xml
  • %Program Files%\Corner Sunshine\res\CN\UISkin1.xml
  • %Program Files%\Corner Sunshine\res\CN\UISkin2.xml
  • %Program Files%\Corner Sunshine\res\DE\city_list_item.xml
  • %Program Files%\Corner Sunshine\res\DE\UISkin1.xml
  • %Program Files%\Corner Sunshine\res\DE\UISkin2.xml
  • %Program Files%\Corner Sunshine\res\EN\city_list_item.xml
  • %Program Files%\Corner Sunshine\res\EN\UISkin1.xml
  • %Program Files%\Corner Sunshine\res\EN\UISkin2.xml
  • %Program Files%\Corner Sunshine\res\FR\city_list_item.xml
  • %Program Files%\Corner Sunshine\res\FR\UISkin1.xml
  • %Program Files%\Corner Sunshine\res\FR\UISkin2.xml
  • %Program Files%\Corner Sunshine\res\picture\bg_main.png
  • %Program Files%\Corner Sunshine\res\picture\bg_menu.png
  • %Program Files%\Corner Sunshine\res\picture\bg_search.png
  • %Program Files%\Corner Sunshine\res\picture\bg_user_guide.png
  • %Program Files%\Corner Sunshine\res\picture\btn_cancel.png
  • %Program Files%\Corner Sunshine\res\picture\btn_delete.png
  • %Program Files%\Corner Sunshine\res\picture\btn_menu.png
  • %Program Files%\Corner Sunchine\res\picture\btn_radio.png
  • %Program Files%\Corner Sunchine\res\picture\clear.png
  • %Program Files%\Corner Sunchine\res\picture\cloudy.png
  • %Program Files%\Corner Sunchine\res\picture\cloudy_fg.png
  • %Program Files%\Corner Sunchine\res\picture\fog.png
  • %Program Files%\Corner Sunchine\res\picture\Humidity.png
  • %Program Files%\Corner Sunchine\res\picture\icn_add.png
  • %Program Files%\Corner Sunchine\res\picture\icn_fail.png
  • %Program Files%\Corner Sunchine\res\picture\icn_info_grey.png
  • %Program Files%\Corner Sunchine\res\picture\icn_location_gray.png
  • %Program Files%\Corner Sunchine\res\picture\icn_precipitation.png
  • %Program Files%\Corner Sunchine\res\picture\icn_success.png
  • %Program Files%\Corner Sunchine\res\picture\icn_thermo.png
  • %Program Files%\Corner Sunchine\res\picture\icn_units.png
  • %Program Files%\Corner Sunchine\res\picture\Icon24_layout.png
  • %Program Files%\Corner Sunchine\res\picture\Icon48_layout.png
  • %Program Files%\Corner Sunchine\res\picture\img_degree.png
  • %Program Files%\Corner Sunchine\res\picture\img_dot_normal.png
  • %Program Files%\Corner Sunchine\res\picture\img_dot_selected.png
  • %Program Files%\Corner Sunchine\res\picture\img_minus.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_0.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_1.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_2.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_3.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_4.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_5.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_6.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_7.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_8.png
  • %Program Files%\Corner Sunchine\res\picture\img_num_9.png
  • %Program Files%\Corner Sunchine\res\picture\overcast.png
  • %Program Files%\Corner Sunchine\res\picture\rain.png
  • %Program Files%\Corner Sunchine\res\picture\Refresh.png
  • %Program Files%\Corner Sunchine\res\picture\scrollbar.png
  • %Program Files%\Corner Sunchine\res\picture\sequence.png
  • %Program Files%\Corner Sunchine\res\picture\snow.png
  • %Program Files%\Corner Sunchine\res\picture\sunny.png
  • %Program Files%\Corner Sunchine\res\picture\tstorm.png
  • %Program Files%\Corner Sunchine\res\picture\windy.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\bg.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\btn.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\button.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\buttondown.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\checkbox.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\click.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\close.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\hover.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\normal.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\page1.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\page2.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\page3.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\page4.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\progress_back.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\progress_fore.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\uninstall.png
  • %Program Files%\Corner Sunshine\res\picture\uninstall\uninstalldown.png

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other Details

This potentially unwanted application connects to the following website to send and receive information:

  • http://deo74dnlruyj.{BLOCKED}ront.net/plg/up?qd=CornerSunshine&day=&qv=1.0.2&pd=official&lan=&qu={GUID}&os={OS version}&pi=&it={install time}
  • http://d1x98kyej8b0kj.{BLOCKED}ront.net/v4/sunshine/{GUID}?action=cornersunshine.upgrade.checkstart
  • http://api.{BLOCKED}sunshine.com/?key=autoip&lang={language}
  • http://api.{BLOCKED}sunshine.com/?q=&lang=EN
  • http://download.{BLOCKED}ch100.net/weather_animate/cloudy_E17E6047CF929E7EA4C815F67132B949.zip
  • http://d1x98kyej8b0kj.{BLOCKED}ront.net/v4/sunshine/{GUID}?action=uninstall.cornersunshine.start
  • http://d1x98kyej8b0kj.{BLOCKED}ront.net/v4/sunshine/{GUID}?action=install.cornersunshine.start

NOTES:

This PUA uninstalls itself on Windows XP and below.

It displays an icon on the corner of the taskbar.

It displays the following GUI when icon was clicked:

  SOLUTION

Minimum Scan Engine: 9.800

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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

Disable this malware service

[ Learn More ]
  •  
    • CornerSunshineSvc

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_LOCAL_MACHINE\SOFTWARE\Clients
    • Corner Sunshine
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • Corner Sunshine
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • Corner Sunshine
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services
    • CornerSunshineSvc

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\Corner Sunshine

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA_CORNERSUNSHINE.GA. 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 this Knowledge Base page for more information.


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