Modified by: Bren Matthew Ebriega

ALIASES:

Downloader.Win32.Snojan.gpvu (KASPERSKY); Trj/CI.A (PANDA)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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: 1,282,373 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 27 Mar 2020
Payload: 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.

Installation

This Potentially Unwanted Application drops the following files:

  • %User Temp%\RarSFX0\bass.dll
  • %User Temp%\RarSFX0\bass_aac.dll
  • %User Temp%\RarSFX0\BoxMini.exe
  • %User Temp%\RarSFX0\skin.zip
  • %User Temp%\RarSFX0\start.bat
  • %User Temp%\RarSFX0\update.dll

(Note: %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).)

It adds the following processes:

  • %System%\cmd.exe /c "%User Temp%\RarSFX0\start.bat"
  • %User Temp%\RarSFX0\{filename}

(Note: %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).)

It creates the following folders:

  • %User Temp%\RarSFX0

(Note: %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).)

Other System Modifications

This Potentially Unwanted Application adds the following registry keys as part of its installation routine:

HKLM\SYSTEM\ControlSet001\
Control\MediaResources\MediaResources\
DirectSound
Speaker Configuration = 4

Other Details

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

  • http://box2.{BLOCKED}u.com/client/BoxMiniUpdate.xml
  • http://api2015.{BLOCKED}u.com/soft/testApi.php
  • http://api.{BLOCKED}anlaoge.com/box/gd
  • http://adtest.{BLOCKED}ital.com/rt?type=2

It does the following:

  • Downloads mp3 files and plays them
    • Connects to http://www.{BLOCKED}u.com/html/pxml/1/{mp3name}.xml to retrieve mp3 details
    • Connects to http://{BLOCKED}.{BLOCKED}.181.35/hot/2004/07-13/{mp3name}.mp3 to download the mp3
    • Connects to http://aliyunimg.{BLOCKED}u.com to retrive the image for the mp3
    • The mp3 files are saved at %User Profile%\My Music

  SOLUTION

Minimum Scan Engine: 9.850
SSAPI PATTERN File: 2.275.00
SSAPI PATTERN Date: 02 Apr 2020

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

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

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%\RarSFX0

Step 4

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%\RarSFX0\bass.dll
  • %User Temp%\RarSFX0\bass_aac.dll
  • %User Temp%\RarSFX0\BoxMini.exe
  • %User Temp%\RarSFX0\skin.zip
  • %User Temp%\RarSFX0\start.bat
  • %User Temp%\RarSFX0\update.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.BoxMini.A. 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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