Analysis by: Carlos Villegas Madrid

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Canal de infecção: Downloaded from the Internet, 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 commands from a remote malicious user, effectively compromising the affected system.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

Tipo de compactação: 557490654 bytes
Tipo de arquivo: DLL
Residente na memória: Yes
Data de recebimento das amostras iniciais: 08 Mar 2023
Carga útil: Connects to URLs/IPs, Collects system information, Saves files, Deletes copies of itself, Drops files, Executes commands

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 executed with administrator rights:
    • %System%\{Random Characters}\{Random Characters}.dll
  • If executed without administrator rights:
    • %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 executed with administrator rights:
    • %System%\regsvr32.exe "%System%\{Random Characters}\{Random Characters}.dll"
  • If executed without administrator rights:
    • %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 executed with administrator rights:
    • %System%\{Random Characters}
  • If executed without administrator rights:
    • %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).)

Backdoor Routine

This Trojan Spy executes the following commands from a remote malicious user:

  • Download and execute code in memory

Information Theft

This Trojan Spy gathers the following data:

  • Computer Name
  • Volume Serial Number
  • OS Information
  • Process ID
  • Machine Time zone

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.
    • http://{BLOCKED}.{BLOCKED}.199.165:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.160.88:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.8.30:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.39.149:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.131.28:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.88.10:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.226.75:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.20.25:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.28.199:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.212.5:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.242.26:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.117.186:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.227.76:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.188.93:443/{random characters}
    • https://{BLOCKED}.{BLOCKED}.126.41:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.166.154:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.146.25:7080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.5.27:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.253.162:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.240.217:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.150.244:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.166.162:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.205.3:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.232.124:443/{random characters}
    • https://{BLOCKED}.{BLOCKED}.159.50:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.201.15:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.35.198:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.221.146:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.146.47:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.155.143:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.202.34:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.45.86:4143/{random characters}
    • http://{BLOCKED}.{BLOCKED}.0.91:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.222.65:443/{random characters}
    • https://{BLOCKED}.{BLOCKED}.143.56:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.32.31:7080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.28.33:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.2.232:8080/{random characters}
    • https://{BLOCKED}.{BLOCKED}.75.120:443/{random characters}
    • https://{BLOCKED}.{BLOCKED}.201.2:443/{random characters}
    • http://{BLOCKED}.{BLOCKED}.103.152:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.142.56:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.196.120:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.99.3:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.156.166:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.193.249:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.227.137:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.135.165:8080/{random characters}
    • http://{BLOCKED}.{BLOCKED}.21.224:8080/{random characters}

It deletes the initially executed copy of itself.

  SOLUTION

Mecanismo de varredura mínima: 9.800
Primeiro arquivo padrão VSAPI: 18.350.05
Data do lançamento do primeiro padrão VSAPI: 29 Mar 2023
VSAPI OPR Pattern Version: 18.351.00
VSAPI OPR Pattern veröffentlicht am: 30 Mar 2023

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

Restart in Safe Mode

[ Learn More ]

Step 4

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

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win64.EMOTET.FCB. 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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