PUA.Win32.KuaiZip.KQ

November 05, 2019
 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • 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

File Size:

4,540,136 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Nov 2019

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 creates the following folders:

  • %Application Data%\ScreenSaver
  • %Application Data%\ScreenSaver\skin2
  • %Application Data%\ScreenSaver\dll
  • %Application Data%\ScreenSaver\skin2\1440x900

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\ScreenSaver\
exe_version

HKEY_CURRENT_USER\Software\ScreenSaver\
dll_version

HKEY_CURRENT_USER\Software\ScreenSaver\
Statistics

HKEY_CURRENT_USER\Software\ScreenSaver\
Settings

It adds the following registry entries:

HKEY_CURRENT_USER\Software\ScreenSaver\
exe_version
version = "1.0.5.8"

HKEY_CURRENT_USER\Software\ScreenSaver\
dll_version
version = "1.0.5.8"

HKEY_CURRENT_USER\Software\ScreenSaver
ScreenSaveTimeOut = "300"

HKEY_CURRENT_USER\Software\ScreenSaver
is_lock_when_exit = "0"

HKEY_CURRENT_USER\Software\ScreenSaver
show_date_and_time = "1"

HKEY_CURRENT_USER\Software\ScreenSaver
show_article = "1"

HKEY_CURRENT_USER\Software\ScreenSaver
use_run_screensaver_hotkey = "0"

HKEY_CURRENT_USER\Software\ScreenSaver
run_screensaver_hotkey = "90"

Dropping Routine

This Potentially Unwanted Application drops the following files:

  • %Application Data%\ScreenSaver\skin2\1440x900\37.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\38.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\44.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\52.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\33.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\53.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\70.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\38.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\31.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\53.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\41.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\79.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\70.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\40.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\74.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\43.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\33.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\43.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\86.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\73.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\72.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\44.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\72.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\85.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\34.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\42.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\41.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\73.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\40.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\37.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\85.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\79.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\31.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\34.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\e6e527f0adad989d04c923405e238fc1_temp.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\42.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\82.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\82.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\74.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\54.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\54.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\52.zip_temp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

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

  • http://screensavers.{BLOCKED}meng.com/skin3/skin.json
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/86.zip
  • http://report.{BLOCKED}savers.shzhanmeng.com/{BLOCKED}savers/stamp_trace?{random characters}
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/79.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/82.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/85.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/70.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/72.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/73.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/74.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/34.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/38.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/42.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/52.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/53.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/54.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/31.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/33.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/37.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/40.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/41.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/43.zip
  • http://screensavers.{BLOCKED}meng.com/skin3/1920x1080/44.zip

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

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\ScreenSaver
    • exe_version
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • dll_version
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • Statistics
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • Settings

Step 3

Delete this registry value

[ 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\ScreenSaver\exe_version
    • version = "1.0.5.8"
  • In HKEY_CURRENT_USER\Software\ScreenSaver\dll_version
    • version = "1.0.5.8"
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • ScreenSaveTimeOut = "300"
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • is_lock_when_exit = "0"
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • show_date_and_time = "1"
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • show_article = "1"
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • use_run_screensaver_hotkey = "0"
  • In HKEY_CURRENT_USER\Software\ScreenSaver
    • run_screensaver_hotkey = "90"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Application Data%\ScreenSaver\skin2\1440x900\37.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\38.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\44.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\52.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\33.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\53.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\70.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\38.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\31.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\53.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\41.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\79.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\70.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\40.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\74.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\43.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\33.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\43.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\86.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\73.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\72.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\44.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\72.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\85.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\34.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\42.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\41.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\73.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\40.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\37.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\85.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\79.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\31.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\34.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\e6e527f0adad989d04c923405e238fc1_temp.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\42.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\82.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\82.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\74.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\54.zip_temp
  • %Application Data%\ScreenSaver\skin2\1440x900\54.zip
  • %Application Data%\ScreenSaver\skin2\1440x900\52.zip_temp

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.
  • %Application Data%\ScreenSaver
  • %Application Data%\ScreenSaver\skin2
  • %Application Data%\ScreenSaver\dll
  • %Application Data%\ScreenSaver\skin2\1440x900

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.KuaiZip.KQ. 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:


Did this description help? Tell us how we did.