PUA_INSTACORE
PUP.Optional.InstallCore.SID.A (Malwarebytes); Riskware/InstallCore (Fortinet); InstallCore (fs) (Sunbelt); a variant of Win32/InstallCore.YV potentially unwanted (ESET-NOD32); Install Core Click run software (Sophos)
Windows
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.
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 number}.log
- %User Temp%\ICReinstall_{number}.exe
- %User Temp%\is{random number}\{random number}_stp.EXE
- %User Temp%\is{random number}\{random number}_stp.EXE.part
- %User Temp%\ish{random number}\bootstrap_{number}.html
- %User Temp%\ish{random number}\css\ie6_main.css
- %User Temp%\ish{random number}\css\main.css
- %User Temp%\ish{random number}\css\sdk-ui\browse.css
- %User Temp%\ish{random number}\css\sdk-ui\button.css
- %User Temp%\ish{random number}\css\sdk-ui\checkbox.css
- %User Temp%\ish{random number}\css\sdk-ui\images\button-bg.png
- %User Temp%\ish{random number}\css\sdk-ui\images\progress-bg.png
- %User Temp%\ish{random number}\css\sdk-ui\images\progress-bg2.png
- %User Temp%\ish{random number}\css\sdk-ui\images\progress-bg-corner.png
- %User Temp%\ish{random number}\css\sdk-ui\progress-bar.css
- %User Temp%\ish{random number}\csshover3.htc
- %User Temp%\ish{random number}\dat\upd.DAT
- %User Temp%\ish{random number}\form.bmp.Mask
- %User Temp%\ish{random number}\images\BG.png
- %User Temp%\ish{random number}\images\Close.png
- %User Temp%\ish{random number}\images\Close_Hover.png
- %User Temp%\ish{random number}\images\Color_Button.png
- %User Temp%\ish{random number}\images\Color_Button_Hover.png
- %User Temp%\ish{random number}\images\default_tb.png
- %User Temp%\ish{random number}\images\default_wi.png
- %User Temp%\ish{random number}\images\Grey_Button.png
- %User Temp%\ish{random number}\images\Grey_Button_Hover.png
- %User Temp%\ish{random number}\images\Icon_Generic.png
- %User Temp%\ish{random number}\images\Loader.gif
- %User Temp%\ish{random number}\images\Pause_Button.png
- %User Temp%\ish{random number}\images\Progress.png
- %User Temp%\ish{random number}\images\ProgressBar.png
- %User Temp%\ish{random number}\images\Quick_Specs.png
- %User Temp%\ish{random number}\images\Resume_Button.png
- %User Temp%\ish{random number}\images\sponsored.png
- %User Temp%\ish{random number}\images\text-bg.png
- %User Temp%\ish{random number}\locale\CS.locale
- %User Temp%\ish{random number}\locale\DA.locale
- %User Temp%\ish{random number}\locale\DE.locale
- %User Temp%\ish{random number}\locale\EL.locale
- %User Temp%\ish{random number}\locale\EN.locale
- %User Temp%\ish{random number}\locale\ES.locale
- %User Temp%\ish{random number}\locale\FI.locale
- %User Temp%\ish{random number}\locale\FR.locale
- %User Temp%\ish{random number}\locale\ID.locale
- %User Temp%\ish{random number}\locale\IT.locale
- %User Temp%\ish{random number}\locale\JA.locale
- %User Temp%\ish{random number}\locale\KO.locale
- %User Temp%\ish{random number}\locale\NL.locale
- %User Temp%\ish{random number}\locale\NO.locale
- %User Temp%\ish{random number}\locale\PL.locale
- %User Temp%\ish{random number}\locale\PT.locale
- %User Temp%\ish{random number}\locale\RU.locale
- %User Temp%\ish{random number}\locale\SV.locale
- %User Temp%\ish{random number}\locale\TR.locale
- %User Temp%\ish{random number}\locale\ZH.locale
(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%\is{random number}
- %User Temp%\ish{random number}
- %User Temp%\ish{random number}\css
- %User Temp%\ish{random number}\images
- %User Temp%\ish{random number}\locale
- %User Temp%\ish{random number}\dat
(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 Details
This potentially unwanted application connects to the following possibly malicious URL:
- http://giserv.{BLOCKED}no.com/details
- http://info.{BLOCKED}no.com/?v=1.03&c={data}
- http://os.{BLOCKED}no.com/Coinis/?v=5.0&c={data}
- http://os2.{BLOCKED}no.com/Coinis/?v=5.0&c={data}
- http://rp.{BLOCKED}no.com/?pcrc={data}
- http://emb.{BLOCKED}twareking.com/cast/emb.html
- http://os.{BLOCKED}twareking.com/MEDIA_YTZ/?v=5.0&c={data}
- http://os2.{BLOCKED}twareking.com/Aff-AD/?v=5.0&c={data}
- http://rp.{BLOCKED}twareking.com/?pcrc={data}
- http://info.{BLOCKED}v.com/?v=1.03&c=?pcrc={data}
- http://os.{BLOCKED}v.com/Vittalia/?v=5.0&c={data}
- http://rp.{BLOCKED}v.com/?pcrc={data}
- http://cdneu.{BLOCKED}iacdn.com/ofr/Malaromoro/Malaromoro.cis
- http://cdneu.{BLOCKED}iacdn.com/ofr/Mapayuy/Mapayuy_0819.cis
- http://cdnus.{BLOCKED}iacdn.com/ofr/Malaromoro/Malaromoro.cis
- http://cdnus.{BLOCKED}iacdn.com/ofr/Mapayuy/Mapayuy_0819.cis
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
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
Search and delete these folders
- %User Temp%\is{random number}
- %User Temp%\ish{random number}
- %User Temp%\ish{random number}\css
- %User Temp%\ish{random number}\images
- %User Temp%\ish{random number}\locale
- %User Temp%\ish{random number}\dat
Step 4
Search and delete these files
- %User Temp%\{random number}.log
- %User Temp%\ICReinstall_{number}.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as PUA_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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