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: 821,504 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 01 Jun 2020

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%\kingsoft\office6\update\dump
  • %Application Data%\kingsoft\office6\update
  • %Application Data%\kingsoft\office6
  • %Application Data%\kingsoft
  • %Application Data%\kingsoft\office6\update\log

(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 entries:

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo\cacheStatusInfo
RunningPid = "2320"

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo
LastCheckTime = "2020-02-02 11:44:26"

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo
LastLog = "MjAyMC0wMi0wMiAxMTo0NDoyNjszOzB4ODAwMDQwMDU="

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo\cacheStatusInfo
wpsUpdateStatusDetail = "NetError"

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo\cacheStatusInfo
wpsUpdateStatus = "UpdateError"

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo
LastHttpsMode = "0"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Kingsoft\
Office\6.0\Common\
updateinfo\cacheStatusInfo\RunningPid

Dropping Routine

This Potentially Unwanted Application drops the following files:

  • %Application Data%\kingsoft\office6\update\log\wpsupdate_2020_02_02.log

(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).)

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 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\Kingsoft\Office\6.0\Common\updateinfo\cacheStatusInfo
    • RunningPid = "2320"
  • In HKEY_CURRENT_USER\Software\Kingsoft\Office\6.0\Common\updateinfo
    • LastCheckTime = "2020-02-02 11:44:26"
  • In HKEY_CURRENT_USER\Software\Kingsoft\Office\6.0\Common\updateinfo
    • LastLog = "MjAyMC0wMi0wMiAxMTo0NDoyNjszOzB4ODAwMDQwMDU="
  • In HKEY_CURRENT_USER\Software\Kingsoft\Office\6.0\Common\updateinfo\cacheStatusInfo
    • wpsUpdateStatusDetail = "NetError"
  • In HKEY_CURRENT_USER\Software\Kingsoft\Office\6.0\Common\updateinfo\cacheStatusInfo
    • wpsUpdateStatus = "UpdateError"
  • In HKEY_CURRENT_USER\Software\Kingsoft\Office\6.0\Common\updateinfo
    • LastHttpsMode = "0"

Step 3

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.
  • %Application Data%\kingsoft\office6\update\log\wpsupdate_2020_02_02.log

Step 4

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%\kingsoft\office6\update\dump
  • %Application Data%\kingsoft\office6\update
  • %Application Data%\kingsoft\office6
  • %Application Data%\kingsoft
  • %Application Data%\kingsoft\office6\update\log

Step 5

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

Step 6

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Kingsoft\Office\6.0\Common\updateinfo\cacheStatusInfo
    • RunningPid


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