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PUA.Win32.YouXun.AN

May 14, 2020
 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:

4,699,168 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 May 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%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9
  • %Application Data%\youxunbox

(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\Youxun\
stat
year = "2020"

HKEY_CURRENT_USER\Software\Youxun\
stat
month = "1"

HKEY_CURRENT_USER\Software\Youxun\
stat
day = "12"

Dropping Routine

This Potentially Unwanted Application drops the following files:

  • %Application Data%\youxunbox\wangzdh.ico
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down1.7z
  • %Application Data%\youxunbox\aitb.ico
  • %Application Data%\youxunbox\main.7z
  • %AppDataLocal%\GDIPFONTCACHEV1.DAT
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down.7z
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\2.7z
  • %Application Data%\youxunbox\shipin.ico
  • %Application Data%\youxunbox\baidu.ico
  • %Application Data%\youxunbox\cjsf.ico
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down.zip
  • %Application Data%\youxunbox\caipiao.ico
  • %Application Data%\youxunbox\temai.ico
  • %Application Data%\youxunbox\jhs.ico
  • %Application Data%\youxunbox\biantaisifu.ico
  • %Application Data%\youxunbox\tmall.ico
  • %Application Data%\youxunbox\lsqy_tb.ico
  • %Application Data%\youxunbox\tmmarket.ico
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down.7z
  • %Application Data%\youxunbox\atb.ico
  • %Application Data%\youxunbox\cqsf.ico
  • %Application Data%\youxunbox\toutiao.ico
  • %Application Data%\youxunbox\zqcq.ico
  • %User Temp%\20200112111026.dmp

(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).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp 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\Youxun\stat
    • year = "2020"
  • In HKEY_CURRENT_USER\Software\Youxun\stat
    • month = "1"
  • In HKEY_CURRENT_USER\Software\Youxun\stat
    • day = "12"

Step 3

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%\youxunbox\wangzdh.ico
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down1.7z
  • %Application Data%\youxunbox\aitb.ico
  • %Application Data%\youxunbox\main.7z
  • %AppDataLocal%\GDIPFONTCACHEV1.DAT
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down.7z
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\2.7z
  • %Application Data%\youxunbox\shipin.ico
  • %Application Data%\youxunbox\baidu.ico
  • %Application Data%\youxunbox\cjsf.ico
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down.zip
  • %Application Data%\youxunbox\caipiao.ico
  • %Application Data%\youxunbox\temai.ico
  • %Application Data%\youxunbox\jhs.ico
  • %Application Data%\youxunbox\biantaisifu.ico
  • %Application Data%\youxunbox\tmall.ico
  • %Application Data%\youxunbox\lsqy_tb.ico
  • %Application Data%\youxunbox\tmmarket.ico
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\down.7z
  • %Application Data%\youxunbox\atb.ico
  • %Application Data%\youxunbox\cqsf.ico
  • %Application Data%\youxunbox\toutiao.ico
  • %Application Data%\youxunbox\zqcq.ico
  • %User Temp%\20200112111026.dmp

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%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9
  • %Application Data%\youxunbox\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9\xe6\x96\xb0\xe5\xbb\xba\xe6\x96\x87\xe4\xbb\xb6\xe5\xa4\xb9
  • %Application Data%\youxunbox

Step 5

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.YouXun.AN. 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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