Trojan.Win32.WACATAC.THDOGBO

April 20, 2020
 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:

2,343,588 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Apr 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:

  • %System Root%\r2175b2000\op.exe he name "Malaysia" is a combination of the word "Malay" and the Latin-Greek suffix "-sia"/-\xc3\x8f\xc6\x92\xc3\x8e\xc2\xaf\xc3\x8e\xc2\xb1.[14] The word "melayu" in Malay may derive from the Tamil words "malai" and "ur" meaning "mountain" and "city, land", respectively.[15][16][17] "Malayadvipa" was the word used by ancient Indian traders when referring to the Malay Peninsula.[18][19][20][21][22] Whether or not it originated from these roots, the word "melayu" or "mlayu" may have been used in early Malay/Javanese to mean to steadily accelerate or run. This term was applied to describe the strong current of the river Melayu in Sumatra.[23] The name was later adopted by the Melayu Kingdom that existed in the seventh century on Sumatra.[24][25]
  • %System Root%\r2175b2000\mtxppj.exe rijpmbset.qfn
  • OI.exe Malaysia has its origins in the Malay kingdoms which, from the 18th century,
  • %User Profile%\f8837e5313\lioqhe.exe xvxpglosl.xkb
  • "netsh" wlan show profile
  • %System%\lsass.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %User Profile%\f8837e5313
  • %System Root%\r2175b2000
  • %User Profile%\temp

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} 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 System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
UPDATE = "%System Root%\R2175B~1\mtxppj.exe %System Root%\R2175B~1\RIJPMB~1.QFN"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
UPDATE = "%User Profile%\F8837E~1\lioqhe.exe %User Profile%\F8837E~1\XVXPGL~1.XKB"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\f8837e5313\emhurfjo.docx
  • %User Profile%\f8837e5313\vnqoxxdav.msc
  • %System Root%\r2175b2000\bihj.pdf
  • %System Root%\r2175b2000\auunktuxrg.jpg
  • %System Root%\r2175b2000\oiqmswew.cpl
  • %User Profile%\f8837e5313\fcdfqkhp.pdf
  • %System Root%\r2175b2000\hohvpmqhgg.bin
  • %User Profile%\f8837e5313\oerjrktq.cpl
  • %User Profile%\f8837e5313\egimes.jpg
  • %System Root%\r2175b2000\birf.xl
  • %System Root%\r2175b2000\urbgam.log
  • %System Root%\r2175b2000\qitb.pdf
  • %User Profile%\f8837e5313\lioqhe.exe
  • %System Root%\r2175b2000\ctijkb.ppt
  • %User Profile%\f8837e5313\mvfqsjdmi.txt
  • %System Root%\r2175b2000\op.exe
  • %User Profile%\f8837e5313\iaianlg.xls
  • %User Profile%\temp\pvaxdhitv.bin
  • %User Profile%\f8837e5313\ehvivur.ico
  • %User Profile%\f8837e5313\vqucilxfj.docx
  • %System Root%\r2175b2000\vnafuhkwu.log
  • %System Root%\r2175b2000\rijpmbset.qfn
  • %System Root%\r2175b2000\udubfamcs.docx
  • %User Profile%\f8837e5313\jkhomwak.vbs
  • %User Profile%\f8837e5313\tjkxxrfkqg.xl
  • %System Root%\r2175b2000\hwgfulwwe.mp3
  • %System Root%\r2175b2000\cgulvqora.dll
  • %System Root%\r2175b2000\qhgpbkpd.ico
  • %User Profile%\f8837e5313\lhmhsclsv.mp3
  • %System Root%\r2175b2000\mtxppj.exe
  • %System Root%\r2175b2000\fnme.vbe
  • %User Profile%\f8837e5313\xvxpglosl.xkb
  • %User Profile%\f8837e5313\shiqtxjdis.icm
  • %System Root%\r2175b2000\arboapxp.jpg
  • %System Root%\r2175b2000\pqlghql.xls
  • %System Root%\r2175b2000\aokxqwll.ppt
  • %User Profile%\f8837e5313\lxmvbnbhx.mp3
  • %User Profile%\f8837e5313\mpmcbvrign.docx
  • %User Profile%\f8837e5313\taqnfa.pdf
  • %System Root%\r2175b2000\pvaxdhitv.bin
  • %System Root%\r2175b2000\viwwt.nls
  • %User Profile%\temp\lhquvtph.msc
  • %System Root%\r2175b2000\mafcvwm.bmp
  • %System Root%\r2175b2000\gkmdlvp.ico
  • %User Profile%\f8837e5313\lhquvtph.msc
  • %System Root%\r2175b2000\jtiqioqbme.cpl
  • %User Profile%\f8837e5313\pgkwceld.log
  • %System Root%\r2175b2000\afojrl.txt
  • %System Root%\r2175b2000\nmnlik.ppt
  • %System Root%\r2175b2000\ltwk.icm

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} 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.)

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.THDOGBO

[ 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

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_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • UPDATE = "%System Root%\R2175B~1\mtxppj.exe %System Root%\R2175B~1\RIJPMB~1.QFN"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • UPDATE = "%User Profile%\F8837E~1\lioqhe.exe %User Profile%\F8837E~1\XVXPGL~1.XKB"

Step 4

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 Profile%\f8837e5313\emhurfjo.docx
  • %User Profile%\f8837e5313\vnqoxxdav.msc
  • %System Root%\r2175b2000\bihj.pdf
  • %System Root%\r2175b2000\auunktuxrg.jpg
  • %System Root%\r2175b2000\oiqmswew.cpl
  • %User Profile%\f8837e5313\fcdfqkhp.pdf
  • %System Root%\r2175b2000\hohvpmqhgg.bin
  • %User Profile%\f8837e5313\oerjrktq.cpl
  • %User Profile%\f8837e5313\egimes.jpg
  • %System Root%\r2175b2000\birf.xl
  • %System Root%\r2175b2000\urbgam.log
  • %System Root%\r2175b2000\qitb.pdf
  • %User Profile%\f8837e5313\lioqhe.exe
  • %System Root%\r2175b2000\ctijkb.ppt
  • %User Profile%\f8837e5313\mvfqsjdmi.txt
  • %System Root%\r2175b2000\op.exe
  • %User Profile%\f8837e5313\iaianlg.xls
  • %User Profile%\temp\pvaxdhitv.bin
  • %User Profile%\f8837e5313\ehvivur.ico
  • %User Profile%\f8837e5313\vqucilxfj.docx
  • %System Root%\r2175b2000\vnafuhkwu.log
  • %System Root%\r2175b2000\rijpmbset.qfn
  • %System Root%\r2175b2000\udubfamcs.docx
  • %User Profile%\f8837e5313\jkhomwak.vbs
  • %User Profile%\f8837e5313\tjkxxrfkqg.xl
  • %System Root%\r2175b2000\hwgfulwwe.mp3
  • %System Root%\r2175b2000\cgulvqora.dll
  • %System Root%\r2175b2000\qhgpbkpd.ico
  • %User Profile%\f8837e5313\lhmhsclsv.mp3
  • %System Root%\r2175b2000\mtxppj.exe
  • %System Root%\r2175b2000\fnme.vbe
  • %User Profile%\f8837e5313\xvxpglosl.xkb
  • %User Profile%\f8837e5313\shiqtxjdis.icm
  • %System Root%\r2175b2000\arboapxp.jpg
  • %System Root%\r2175b2000\pqlghql.xls
  • %System Root%\r2175b2000\aokxqwll.ppt
  • %User Profile%\f8837e5313\lxmvbnbhx.mp3
  • %User Profile%\f8837e5313\mpmcbvrign.docx
  • %User Profile%\f8837e5313\taqnfa.pdf
  • %System Root%\r2175b2000\pvaxdhitv.bin
  • %System Root%\r2175b2000\viwwt.nls
  • %User Profile%\temp\lhquvtph.msc
  • %System Root%\r2175b2000\mafcvwm.bmp
  • %System Root%\r2175b2000\gkmdlvp.ico
  • %User Profile%\f8837e5313\lhquvtph.msc
  • %System Root%\r2175b2000\jtiqioqbme.cpl
  • %User Profile%\f8837e5313\pgkwceld.log
  • %System Root%\r2175b2000\afojrl.txt
  • %System Root%\r2175b2000\nmnlik.ppt
  • %System Root%\r2175b2000\ltwk.icm

Step 5

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 Profile%\f8837e5313
  • %System Root%\r2175b2000
  • %User Profile%\temp

Step 6

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