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What is GreatZip?

The Malwarebytes research team has determined that GreatZip is adware. These adware applications display advertisements not originating from the sites you are browsing.
The installer also bundles several other PUPs and adware programs.

How do I know if my computer is affected by GreatZip?

You may see these warnings and additional offers during install:

warning1.png

warning2.png

warning3.png

warning5.png

and this icon in your startmenu:

icons.png

You may see this new entry in your list of installed programs and features:

warning4.png

How did GreatZip get on my computer?

Adware applications use different methods for distributing themselves. This particular one was downloaded from their website.

website.png

How do I remove GreatZip?

Our program Malwarebytes can detect and remove this potentially unwanted program.
  • Please download Malwarebytes to your desktop.
  • Double-click mb3-setup-consumer-{version}.exe and follow the prompts to install the program.
  • Then click Finish.
  • Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
  • If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
  • When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  • Restart your computer when prompted to do so.
Is there anything else I need to do to get rid of GreatZip?
  • No, Malwarebytes removes GreatZip completely.
How would the full version of Malwarebytes help protect me?

We hope our application and this guide have helped you eradicate this adware.

As you can see below the full version of Malwarebytes would have protected you against the GreatZip adware. It would have warned you before the adware could install itself, giving you a chance to stop it before it became too late.

 

protection1.png


The web protection module also blocks their domain:
 

protection2.png


Technical details for experts

Possible signs in FRST logs:

 
 (T M R G  , INC.) C:\Users\{username}\AppData\Roaming\DownloadGreatZip\rkverify.exe
 C:\Users\{username}\AppData\Roaming\DownloadGreatZip
 C:\ProgramData\Microsoft\Windows\Start Menu\Programs\GreatZip
 C:\Program Files (x86)\GreatZip

GreatZipInstaller (HKLM-x32\...\GreatZip) (Version:  - )
Changes made by the installer after declining all the extra offers:
 
File system details [View: All details] (Selection)
---------------------------------------------------
    Adds the folder C:\Program Files (x86)\GreatZip
       Adds the file 7z.dll"="4/18/2011 10:54 PM, 941568 bytes, A
       Adds the file 7z.exe"="4/18/2011 10:34 PM, 168448 bytes, A
       Adds the file 7z.sfx"="4/18/2011 10:54 PM, 161280 bytes, A
       Adds the file 7zCon.sfx"="4/18/2011 10:54 PM, 151040 bytes, A
       Adds the file 7-zip.dll"="4/18/2011 10:34 PM, 56320 bytes, A
       Adds the file descript.ion"="4/4/2011 3:54 PM, 366 bytes, A
       Adds the file GreatZIP.chm"="11/4/2012 8:21 AM, 89615 bytes, A
       Adds the file GreatZIP.exe"="11/5/2012 2:56 PM, 457728 bytes, A
       Adds the file GzG.exe"="11/3/2012 4:40 PM, 279040 bytes, A
       Adds the file History.txt"="4/18/2011 9:47 PM, 33372 bytes, A
       Adds the file License.txt"="1/9/2011 10:08 AM, 1927 bytes, A
       Adds the file readme.txt"="1/10/2011 12:27 PM, 1571 bytes, A
       Adds the file Uninstall.exe"="8/21/2017 11:10 AM, 57037 bytes, A
    Adds the folder C:\Program Files (x86)\GreatZip\Lang
       Adds the file en.ttt"="9/4/2013 9:10 PM, 12529 bytes, A
    Adds the folder C:\ProgramData\Microsoft\Windows\Start Menu\Programs\GreatZip
       Adds the file GreatZip File Manager.lnk"="8/21/2017 11:10 AM, 1025 bytes, A
       Adds the file GreatZip Help.lnk"="8/21/2017 11:10 AM, 1025 bytes, A
    Adds the folder C:\Users\{username}\AppData\Roaming\DownloadGreatZip
       Adds the file greatzip.exe"="8/21/2017 11:10 AM, 943329 bytes, A
       Adds the file rkinstaller.exe"="8/21/2017 11:10 AM, 394520 bytes, A
       Adds the file rkverify.exe"="8/21/2017 11:10 AM, 381968 bytes, A

Registry details [View: All details] (Selection)
------------------------------------------------
    [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{23170F69-40C1-278A-1000-000100020000}]
       "(Default)"="REG_SZ", "GreatZip Shell Extension"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{23170F69-40C1-278A-1000-000100020000}\InprocServer32]
       "(Default)"="REG_SZ", "C:\Program Files (x86)\GreatZIP\7-zip.dll"
       "ThreadingModel"="REG_SZ", "Apartment"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\GreatZip.exe]
       "(Default)"="REG_SZ", "C:\Program Files (x86)\GreatZIP\GreatZip.exe"
       "Path"="REG_SZ", "C:\Program Files (x86)\GreatZIP"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\GreatZip]
       "Path"="REG_SZ", "C:\Program Files (x86)\GreatZIP"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved]
       "{23170F69-40C1-278A-1000-000100020000}"="REG_SZ", "GreatZip Shell Extension"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\GreatZip]
       "DisplayName"="REG_SZ", "GreatZipInstaller"
       "NoModify"="REG_DWORD", 1
       "NoRepair"="REG_DWORD", 1
       "UninstallString"="REG_SZ", ""C:\Program Files (x86)\GreatZIP\Uninstall.exe""
    [HKEY_CURRENT_USER\Software\GreatZip]
       "Path"="REG_SZ", "C:\Program Files (x86)\GreatZIP"
Malwarebytes log:
 
Malwarebytes
www.malwarebytes.com

-Log Details-
Scan Date: 8/21/17
Scan Time: 11:19 AM
Log File: mbamGreatZip.txt
Administrator: Yes

-Software Information-
Version: 3.1.2.1733
Components Version: 1.0.160
Update Package Version: 1.0.2628
License: Premium

-System Information-
OS: Windows 7 Service Pack 1
CPU: x64
File System: NTFS
User: {computername}\{username}

-Scan Summary-
Scan Type: Threat Scan
Result: Completed
Objects Scanned: 321724
Threats Detected: 35
Threats Quarantined: 35
Time Elapsed: 5 min, 21 sec

-Scan Options-
Memory: Enabled
Startup: Enabled
Filesystem: Enabled
Archives: Enabled
Rootkits: Disabled
Heuristics: Enabled
PUP: Enabled
PUM: Enabled

-Scan Details-
Process: 1
PUP.Optional.RelevantKnowledge, C:\USERS\{username}\APPDATA\ROAMING\DOWNLOADGREATZIP\RKVERIFY.EXE, Quarantined, [1184], [294394],1.0.2628

Module: 1
PUP.Optional.RelevantKnowledge, C:\USERS\{username}\APPDATA\ROAMING\DOWNLOADGREATZIP\RKVERIFY.EXE, Quarantined, [1184], [294394],1.0.2628

Registry Key: 7
PUP.Optional.MyBit, HKLM\SOFTWARE\CLASSES\WOW6432NODE\CLSID\{23170F69-40C1-278A-1000-000100020000}, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, HKLM\SOFTWARE\WOW6432NODE\CLASSES\CLSID\{23170F69-40C1-278A-1000-000100020000}, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, HKLM\SOFTWARE\CLASSES\WOW6432NODE\CLSID\{23170F69-40C1-278A-1000-000100020000}\InprocServer32, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, HKLM\SOFTWARE\WOW6432NODE\CLASSES\CLSID\{23170F69-40C1-278A-1000-000100020000}\InprocServer32, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, HKLM\SOFTWARE\WOW6432NODE\MICROSOFT\WINDOWS\CURRENTVERSION\UNINSTALL\GreatZip, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.GreatZip, HKCU\SOFTWARE\GreatZip, Delete-on-Reboot, [8653], [427200],1.0.2628
PUP.Optional.GreatZip, HKCU\SOFTWARE\GreatZip, Delete-on-Reboot, [8653], [427200],1.0.2628

Registry Value: 1
PUP.Optional.MyBit, HKLM\SOFTWARE\WOW6432NODE\MICROSOFT\WINDOWS\CURRENTVERSION\SHELL EXTENSIONS\APPROVED|{23170F69-40C1-278A-1000-000100020000}, Delete-on-Reboot, [1826], [361607],1.0.2628

Registry Data: 0
(No malicious items detected)

Data Stream: 0
(No malicious items detected)

Folder: 3
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\Lang, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\PROGRAM FILES (X86)\GreatZip, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.GreatZip, C:\PROGRAMDATA\MICROSOFT\WINDOWS\START MENU\PROGRAMS\GREATZIP, Delete-on-Reboot, [8653], [427191],1.0.2628

File: 22
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\Lang\en.ttt, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\7-zip.dll, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\7z.dll, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\7z.exe, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\7z.sfx, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\7zCon.sfx, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\descript.ion, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\GreatZIP.chm, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\GreatZIP.exe, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\GzG.exe, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\History.txt, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\License.txt, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\readme.txt, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.MyBit, C:\Program Files (x86)\GreatZip\Uninstall.exe, Delete-on-Reboot, [1826], [361607],1.0.2628
PUP.Optional.RelevantKnowledge, C:\USERS\{username}\APPDATA\ROAMING\DOWNLOADGREATZIP\RKVERIFY.EXE, Delete-on-Reboot, [1184], [294394],1.0.2628
PUP.Optional.RelevantKnowledge, C:\USERS\{username}1\APPDATA\LOCAL\TEMP\CSM6476.TMP, Delete-on-Reboot, [1184], [294396],1.0.2628
PUP.Optional.GreatZip, C:\ProgramData\Microsoft\Windows\Start Menu\Programs\GreatZip\GreatZip File Manager.lnk, Delete-on-Reboot, [8653], [427191],1.0.2628
PUP.Optional.GreatZip, C:\ProgramData\Microsoft\Windows\Start Menu\Programs\GreatZip\GreatZip Help.lnk, Delete-on-Reboot, [8653], [427191],1.0.2628
PUP.Optional.RelevantKnowledge, C:\USERS\{username}\APPDATA\ROAMING\DOWNLOADGREATZIP\RKINSTALLER.EXE, Delete-on-Reboot, [1184], [296186],1.0.2628
PUP.Optional.GreatZip, C:\USERS\{username}\DESKTOP\GREATZIP.EXE, Delete-on-Reboot, [8653], [427190],1.0.2628
PUP.Optional.MyBit, C:\USERS\{username}\DESKTOP\SETUP.EXE, Delete-on-Reboot, [1826], [361606],1.0.2628
PUP.Optional.RelevantKnowledge, C:\USERS\{username}\APPDATA\LOCAL\TEMP\CSM6476.TMP, Delete-on-Reboot, [1184], [294396],1.0.2628

Physical Sector: 0
(No malicious items detected)


(end)
As mentioned before the full version of Malwarebytes could have protected your computer against this threat.
We use different ways of protecting your computer(s):
  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention
Save yourself the hassle and get protected.

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