PUA_INSTALLCORE.GZ

March 06, 2018
 Analysis by: Mio Fidel Villena
 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

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:

1,597,257 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Mar 2018

Payload:

Drops files, Connects to URLs/IPs

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%\{random}.log
  • %User Temp%\in{random}\css\ie6_main.css
  • %User Temp%\in{random}\css\main.css
  • %User Temp%\in{random}\css\sdk-ui\browse.css
  • %User Temp%\in{random}\css\sdk-ui\button.css
  • %User Temp%\in{random}\css\sdk-ui\checkbox.css
  • %User Temp%\in{random}\css\sdk-ui\images\button-bg.png
  • %User Temp%\in{random}\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\in{random}\css\sdk-ui\images\progress-bg.png
  • %User Temp%\in{random}\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\in{random}\css\sdk-ui\progress-bar.css
  • %User Temp%\in{random}\csshover3.htc
  • %User Temp%\in{random}\form.bmp.Mask
  • %User Temp%\in{random}\images\arrow.png
  • %User Temp%\in{random}\images\BG.png
  • %User Temp%\in{random}\images\Close.png
  • %User Temp%\in{random}\images\Close_Hover.png
  • %User Temp%\in{random}\images\Color_Button.png
  • %User Temp%\in{random}\images\Color_Button_Hover.png
  • %User Temp%\in{random}\images\default_tb.png
  • %User Temp%\in{random}\images\default_wi.png
  • %User Temp%\in{random}\images\Grey_Button.png
  • %User Temp%\in{random}\images\Grey_Button_Hover.png
  • %User Temp%\in{random}\images\Icon_Generic.png
  • %User Temp%\in{random}\images\Loader.gif
  • %User Temp%\in{random}\images\Pause_Button.png
  • %User Temp%\in{random}\images\Progress.png
  • %User Temp%\in{random}\images\ProgressBar.png
  • %User Temp%\in{random}\images\Quick_Specs.png
  • %User Temp%\in{random}\images\Resume_Button.png
  • %User Temp%\in{random}\images\sponsored.png
  • %User Temp%\in{random}\locale\CS.locale
  • %User Temp%\in{random}\locale\DA.locale
  • %User Temp%\in{random}\locale\DE.locale
  • %User Temp%\in{random}\locale\EL.locale
  • %User Temp%\in{random}\locale\EN.locale
  • %User Temp%\in{random}\locale\ES.locale
  • %User Temp%\in{random}\locale\FI.locale
  • %User Temp%\in{random}\locale\FR.locale
  • %User Temp%\in{random}\locale\ID.locale
  • %User Temp%\in{random}\locale\IT.locale
  • %User Temp%\in{random}\locale\JA.locale
  • %User Temp%\in{random}\locale\KO.locale
  • %User Temp%\in{random}\locale\NL.locale
  • %User Temp%\in{random}\locale\NO.locale
  • %User Temp%\in{random}\locale\PL.locale
  • %User Temp%\in{random}\locale\PT.locale
  • %User Temp%\in{random}\locale\RU.locale
  • %User Temp%\in{random}\locale\SV.locale
  • %User Temp%\in{random}\locale\TR.locale
  • %User Temp%\in{random}\locale\ZH.locale
  • %User Temp%\in{random}\bootstrap_35506.html
  • %User Temp%\daraden\lilasan

(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 Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Setting
JITDebug = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = {malware name}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = 708992537

HKEY_CURRENT_USER\Software\CoinisRevShare
flashplayer_setup.exe = 1520314272493,http://appsstaticitpytfh82o.s3.amazonaws.com/install_flash_player_13_plugin.exe

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
vendor_id = ic

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
publisher_id = {random characters}

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
install_id = {random characters}

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
install_time_client = {Date&Time}

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
install_time_server = {Date&Time}

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
channel = {random characters}

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
advertisers_ids = {random characters}

HKEY_CURRENT_USER\Software\csastats\
ic\{install id value}
hmac_sha256_validation = {random characters}

HKEY_CURRENT_USER\Software\ProductSetup\
Uninstall\0B2U2Z1P0F1P1G1R1P1V0A1Q1Q0O1G
uninstall = 0B2U2Z1P0F1P1G1R1P0M1F1Q2Y1I1P

HKEY_CURRENT_USER\Software\ProductSetup\
Uninstall\0S1P1T1C1R1MtT0P1C1F2X1L1Q1P1QtT1S2UtT0Y1T1M1F1F

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
7db511425fa522ba5d24fdcfbf202551
{GUID} = S2256

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\pilplloabdedfmialnfchjomjmpjcoej
update_url = https://clients2.google.com/service/update2/crx

HKEY_CURRENT_USER\Software\Google\
Chrome\Extensions\pilplloabdedfmialnfchjomjmpjcoej
update_url = https://clients2.google.com/service/update2/crx

Other Details

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

  • http://{BLOCKED}.{BLOCKED}oteh.com/
  • http://{BLOCKED}.{BLOCKED}oteh.com/?jewugid=0
  • http://{BLOCKED}.{BLOCKED}oteh.com/?haf=1
  • http://{BLOCKED}.{BLOCKED}oteh.com/?zap=2
  • http://{BLOCKED}.{BLOCKED}oteh.com/?feque=retry
  • http://{BLOCKED}.{BLOCKED}oteh.com/?tepe=retry
  • http://{BLOCKED}.{BLOCKED}oteh.com/CoinisRevShare
  • http://{BLOCKED}ina38q6v9z2k.{BLOCKED}.amazonaws.com/icons/lps/images/icons/AdobeFlash_32.png
  • http://{BLOCKED}aticitpytfh82o.{BLOCKED}.amazonaws.com/install_flash_player_13_plugin.exe
  • http://{BLOCKED}.{BLOCKED}oteh.com/img/Jimomoromoj/Jimomoromoj_logo.png
  • http://{BLOCKED}.{BLOCKED}oteh.com/ofr/Gigigiyiwig/Gigigiyiwig_b.cis
  • http://{BLOCKED}.{BLOCKED}oteh.com/ofr/Gigigiyiwig/Gigigiyiwig_b.cis
  • http://{BLOCKED}.{BLOCKED}oteh.com/ofr/Gigigiyiwig/Gigigiyiwig_b.cis
  • http://{BLOCKED}.{BLOCKED}oteh.com/ofr/Solululadul/icut_v2_2.cis
  • http://{BLOCKED}.{BLOCKED}oteh.com/ofr/Solululadul/icut_v2_2.cis
  • http://{BLOCKED}ca.{BLOCKED}/
  • http://{BLOCKED}qh0a47e0.{BLOCKED}ront.net/4.21.0.89.dat
  • http://{BLOCKED}.{BLOCKED}/

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

1.925.00

SSAPI PATTERN Date:

08 Mar 2018

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

Identify and terminate files detected as PUA_INSTALLCORE.GZ

[ 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 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_CURRENT_USER\Software\Microsoft\Windows Script
    • JITDebug = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • Name = "{malware name}"
  • In HKEY_CURRENT_USER\Software
    • CoinisRevShare
  • In HKEY_CURRENT_USER\Software
    • csastats
  • In HKEY_CURRENT_USER\Software
    • ProductSetup
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • 7db511425fa522ba5d24fdcfbf202551
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Google\Chrome\Extensions
    • pilplloabdedfmialnfchjomjmpjcoe
  • In HKEY_CURRENT_USER\Software\Google\Chrome\Extensions
    • pilplloabdedfmialnfchjomjmpjcoej

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.
  • %User Temp%\in{random}
  • %User Temp%\daraden

Step 6

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 Temp%\{random}.log

Step 7

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