ADW_INSTACORE
InstallCore.b (fs) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Adware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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
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
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
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
- 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.
- 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.
- 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
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
- Adorika
Step 6
Search and delete these folders
- %User Temp%\ish{random}
- %User Temp%\is149698924
- %User Temp%\is1590112554
Step 7
Search and delete this file
- %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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