Analysis by: John Rey Canon
 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 417,792 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 27 Dec 2019

Arrival Details

This Trojan Spy 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 Spy drops and executes the following files:

  • %All Users Profile%\33vQp5GFk03qsZNtnP.exe
  • %System%\trnsacquire.exe

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData 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 adds the following processes:

  • %User Temp%\{Malware Name}.exe --76a466a
  • %System%\trnsacquire.exe --35843687
  • %System%\trnsacquire.exe /scomma "%Windows%\TEMP\DA42.tmp"
  • %System%\trnsacquire.exe "%Windows%\TEMP\E9CB.tmp"
  • %System%\trnsacquire.exe /scomma "%Windows%\TEMP\E9CC.tmp"
  • %System%\trnsacquire.exe "%Windows%\TEMP\DA37.tmp"
  • %All Users Profile%\33vQp5GFk03qsZNtnP.exe --fea66dc8

(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% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Autostart Technique

This Trojan Spy registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\trnsacquire
ImagePath = "%System%\trnsacquire.exe"

Other System Modifications

This Trojan Spy deletes the following files:

  • %System%\privacyduck.exe
  • %Windows%\Temp\DA42.tmp
  • %Windows%\Temp\E9CB.tmp
  • %Windows%\Temp\E9CC.tmp
  • %Windows%\Temp\DA37.tmp

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Dropping Routine

This Trojan Spy drops the following files:

  • %Windows%\Temp\DA42.tmp
  • %Windows%\Temp\E9CB.tmp
  • %Windows%\Temp\E9CC.tmp
  • %Windows%\Temp\DA37.tmp

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

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://{BLOCKED}.30.33:443/1mNPTOO
  • http://{BLOCKED}.30.33:443/QALJSEOx4rDdTT
  • http://{BLOCKED}.30.33:443/IPbai
  • http://{BLOCKED}.30.33:443/VzR82nsyVqaVZ
  • http://{BLOCKED}.30.33:443/VzfcNHTWgQrvPOuzGn
  • http://{BLOCKED}.30.33:443/MkoSbN4SBbM
  • http://{BLOCKED}.30.33:443/kk4bg56i51wRlrpg
  • http://{BLOCKED}.30.33:443/O60AMn
  • http://{BLOCKED}.30.33:443/Ooqst8KLjfTiR
  • http://{BLOCKED}.30.33:443/zUsrDB
  • http://{BLOCKED}.30.33:443/LPVF
  • http://{BLOCKED}.30.33:443/fp10Pbc0d
  • http://{BLOCKED}.30.33:443/zrcAJybUeba9l3wR
  • http://{BLOCKED}.30.33:443/qUu7Z8B1
  • http://{BLOCKED}.30.33:443/abOdNtnIV2jFdvQZDuF
  • http://{BLOCKED}113.102/ncueq
  • http://{BLOCKED}113.102/18ksWuRYsvdx3BT

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.590.05
FIRST VSAPI PATTERN DATE: 30 Dec 2019
VSAPI OPR PATTERN File: 15.591.00
VSAPI OPR PATTERN Date: 31 Dec 2019

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    • TSPY.Win32.TRX.XXPE50FFF033P0005

Step 2

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 3

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 4

Identify and terminate files detected as TrojanSpy.Win32.EMOTET.TIABOFGE

[ 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 5

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\SYSTEM\CurrentControlSet\Services\trnsacquire
    • ImagePath = "%System%\trnsacquire.exe"

Step 6

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.  
  • %All Users Profile%\33vQp5GFk03qsZNtnP.exe
  • %System%\trnsacquire.exe
  • %Windows%\Temp\DA42.tmp
  • %Windows%\Temp\E9CB.tmp
  • %Windows%\Temp\E9CC.tmp
  • %Windows%\Temp\DA37.tmp

Step 7

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.EMOTET.TIABOFGE. 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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