TrojanSpy.Win64.EMOTET.SMYXCD2T

April 13, 2023
 Analysis by: Rojan Dela Cruz
 ALIASES:

W64/Emotet.1151!tr (FORTINET), Trojan:Win64/Emotetcrypt.KD!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

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 executes then deletes itself afterward.

It gathers certain information on the affected computer.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

551,424 bytes

File Type:

DLL

Memory Resident:

Yes

Payload:

Drops files, Deletes files, Steals information, Connects to URLs/IPs

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 the following copies of itself into the affected system and executes them:

  • If run as administrator:
    • %System%\{Random Characters}\{Random Characters}.dll
  • If didn't run as administrator:
    • %AppDataLocal%\{Random Characters}\{Random Characters}.dll

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • If run as administrator:
    • %System%\regsvr32.exe "%System%\{Random Characters}\{Random Characters}.dll"
  • If didn't run as administrator:
    • %System%\regsvr32.exe "%AppDataLocal%\{Random Characters}\{Random Characters}.dll"

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • If run as administrator:
    • %System%\{Random Characters}
  • If didn't run as administrator:
    • %AppDataLocal%\{Random Characters}

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It executes then deletes itself afterward.

Information Theft

This Trojan Spy gathers the following information on the affected computer:

  • Computer Name
  • OS Version
  • Malware path with file name when executed as administrator
  • Malware path with file name when didn't executed as administrator
  • Running processes
  • System Information
  • Windows Version
  • Process ID
  • Time and Date

Other Details

This Trojan Spy does the following:

  • It receives commands and sends encrypted gathered information to the following URLs via HTTP/HTTPS POST by storing it on HTTP POST Headers.
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.12/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.124/{random characters}
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.73:7080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.206/{random characters}
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.41:7080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.199/{random characters}
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.86:4143/{random characters}
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.200:7080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.144/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.155/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.56/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.93/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.99/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.15/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.154/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.206/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.236/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.196/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.30/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.249/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.58/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.5/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.124/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.162/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.45/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.130/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.74/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.124/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.11/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.2/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.127/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.91/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.165/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.186/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.99/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.10/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.3/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.232/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.25/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.238/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.246/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.25/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.198/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.142/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.99/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.137/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.26/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.102/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.89/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.211/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.101/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.162/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.244/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.83/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.206/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.28/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.35/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.33/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.193/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.214/{random characters}
    • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.231/{random characters}
    • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.182/{random characters}

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.285.00

FIRST VSAPI PATTERN DATE:

28 Feb 2023

VSAPI OPR PATTERN File:

18.285.00

VSAPI OPR PATTERN Date:

01 Mar 2023

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:

     
    • Troj.Win32.TRX.XXPE50FFF067

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

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete these files

[ 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.
  • %System%\{Random Characters}\{Random Characters}.dll
  • %AppDataLocal%\{Random Characters}\{Random Characters}.dll

Step 6

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.
  • %System%\{Random Characters}
  • %AppDataLocal%\{Random Characters}

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win64.EMOTET.SMYXCD2T. 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 this Knowledge Base page for more information.


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