Modified by: Adrian Cofreros

ALIASES:

InstallCore.b (fs) (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Adware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 678,768 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 09 Jun 2014
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Adware 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 Adware drops the following copies of itself into the affected system:

  • %User Temp%\ICReinstall_{grayware file name}.exe -deleted afterwards

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • %User Temp%\ish{random}\css
  • %User Temp%\ish{random}\css\sdk-ui
  • %User Temp%\ish{random}\css\sdk-ui\images
  • %User Temp%\ish{random}\images
  • %User Temp%\is149698924
  • %User Temp%\is1590112554
  • %User Temp%\ish{random}

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other System Modifications

This Adware adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Adorika
flashplayer.exe = "{value},{URL of the downloaded file}"

It adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\Adorika

Dropping Routine

This Adware drops the following files:

  • %User Temp%\is1590112554\{random}_stp.CIS
  • %User Temp%\ish{random}\css\ie6_main.css
  • %User Temp%\ish{random}\css\main.css
  • %User Temp%\ish{random}\css\sdk-ui\browse.css
  • %User Temp%\ish{random}\css\sdk-ui\button.css
  • %User Temp%\ish{random}\css\sdk-ui\checkbox.css
  • %User Temp%\ish{random}\css\sdk-ui\images\button-bg.png
  • %User Temp%\ish{random}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ish{random}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ish{random}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ish{random}\css\sdk-ui\progress-bar.css
  • %User Temp%\ish{random}\csshover3.htc
  • %User Temp%\ish{random}\form.bmp.Mask
  • %User Temp%\ish{random}\images\BG.png
  • %User Temp%\ish{random}\images\Close.png
  • %User Temp%\ish{random}\images\Close_Hover.png
  • %User Temp%\ish{random}\images\Color_Button.png
  • %User Temp%\ish{random}\images\Color_Button_Hover.png
  • %User Temp%\ish{random}\images\default_tb.png
  • %User Temp%\ish{random}\images\default_wi.png
  • %User Temp%\ish{random}\images\Grey_Button.png
  • %User Temp%\ish{random}\images\Grey_Button_Hover.png
  • %User Temp%\ish{random}\images\Icon_Generic.png
  • %User Temp%\ish{random}\images\Loader.gif
  • %User Temp%\ish{random}\images\Pause_Button.png
  • %User Temp%\ish{random}\images\Progress.png
  • %User Temp%\ish{random}\images\ProgressBar.png
  • %User Temp%\ish{random}\images\Quick_Specs.png
  • %User Temp%\ish{random}\images\Resume_Button.png
  • %User Temp%\ish{random}\images\sponsored.png
  • %User Temp%\ish{random}\images\welcome_BG.png
  • %User Temp%\ish{random}\locale\EN.locale
  • %User Temp%\is149698924\{random}_stp.EXE
  • %User Temp%\is149698924\{random}_stp.EXE.part
  • %User Temp%\{random}.log -deleted afterwards

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Download Routine

This Adware saves the files it downloads using the following names:

  • %User Profile%\My Documents\Downloads\flashplayer.exe

(Note: %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 and 7.)

Other Details

This Adware connects to the following possibly malicious URL:

  • http://{BLOCKED}i.com/MAIN/IMAGES/v64.jpg
  • http://{BLOCKED}i.com/MAIN/IMAGES/iconFlv.png
  • img.{BLOCKED}riro.com
  • http://os.{BLOCKED}riro.com
  • http://www.{BLOCKED}e.com/MAIN/ironsource/flashplayer.exe -downloads flashplayer.exe
  • http://{BLOCKED}p.{BLOCKED}team.com
  • http://rp.{BLOCKED}creatorapp.com
  • http://{BLOCKED}s.{BLOCKED}creatorapp.com/app/Cmp/PDFCreatorV4.cis
  • http://{BLOCKED}u.{BLOCKED}creatorapp.com/app/Cmp/PDFCreatorV4.cis
  • http://{BLOCKED}t.{BLOCKED}creatorapp.com
  • http://{BLOCKED}2.{BLOCKED}creatorapp.com

NOTES:

It has an option to install its downloaded file as Extreme Flash Player.

  SOLUTION

Minimum Scan Engine: 9.300
SSAPI PATTERN File: 1.504.09
SSAPI PATTERN Date: 24 Apr 2014

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

Remove ADW_INSTACORE by using its own Uninstall option

[ Learn More ]
To uninstall the grayware process

Step 3

Scan your computer with your Trend Micro product and note files detected as ADW_INSTACORE

Step 4

Identify and terminate files detected as ADW_INSTACORE

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 5

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_CURRENT_USER\Software
    • Adorika

Step 6

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.
  • %User Temp%\ish{random}
  • %User Temp%\is149698924
  • %User Temp%\is1590112554

Step 7

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 Profile%\My Documents\Downloads\flashplayer.exe

Step 8

Scan your computer with your Trend Micro product to delete files detected as ADW_INSTACORE. 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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