TrojanSpy.Win32.EMOTET.YXCDL

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 saves downloaded files into the said created folder.

It deletes the initially executed copy of itself.

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 admin rights:
  • %System%\{Random characters}\{Random characters}.{3 random characters}
• If executed without admin rights:
  • %AppDataLocal%\{Random characters}\{Random characters}.{3 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 adds the following processes:

• If executed with admin rights:
  • %System%\regsvr32.exe /s "%System%\{Random characters}\{Random characters}.{3 random characters}
• If executed without admin rights:
  • %System%\regsvr32.exe /s "%AppDataLocal%\{Random characters}\{Random characters}.{3 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 creates the following folders:

• If executed with admin rights:
  • %System%\{Random characters}
• If executed without admin 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).)

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\{File Name of Copy} → If executed with admin rights
ImagePath = %System%\regsvr32.exe /s "%System%\{Random characters}\{Random characters}.{3 random characters}

It adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run → If executed without admin rights
{File Name of Copy} = %System%\regsvr32.exe /s "%AppDataLocal%\{Random characters}\{Random characters}.{3 random characters}

Backdoor Routine

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

• Download and run module or executable file
• Download and execute code in memory

Download Routine

This Trojan Spy saves the files it downloads using the following names:

• For Download and run module command:
  • {Malware Installation Folder Path}\{random characters}.dll
• For Download and run executable file:
  • {Malware Installation Folder Path}\{random characters}.exe

It saves downloaded files into the said created folder.

Information Theft

This Trojan Spy gathers the following data:

• Computer Name
• OS Version
• Process Architecture
• Volume Serial Number
• Windows Version
• Process ID
• Malware Path

Other Details

This Trojan Spy deletes the initially executed copy of itself.

NOTES:

This Trojan Spy does the following:

• It receives commands and sends encrypted gathered information to the following URLs via HTTP/HTTPS GET by storing it in the Cookie header:
  • https://{BLOCKED}.{BLOCKED}.33.122:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.143.248:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.135.27:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.251.50:443/{random characters}
  • https://{BLOCKED}.{BLOCKED}.226.45:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.118.104:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.133.20:443/{random characters}
  • https://{BLOCKED}.{BLOCKED}.201.2:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.116.246:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.70.10:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.158.56:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.201.4:443/{random characters}
  • https://{BLOCKED}.{BLOCKED}.222.101:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.82.211:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.212.130:7080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.48.117:7080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.117.186:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.222.11:443/{random characters}
  • https://{BLOCKED}.{BLOCKED}.30.83:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.7.5:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.128.118:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.84.195:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.193.249:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.135.203:7080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.99.3:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.98.206:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.98.99:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.112.196:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.232.124:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.146.25:7080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.17.99:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.114.231:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.225.142:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.115.99:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.212.216:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.40.196:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.152.127:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.54.215:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.2.232:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.42.236:80/{random characters}
  • https://{BLOCKED}.{BLOCKED}.226.206:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.59.82:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.188.93:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.111.200:7080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.72.26:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.88.10:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.221.247:8080/{random characters}
  • https://{BLOCKED}.{BLOCKED}.20.25:443/{random characters}
  • https://{BLOCKED}.{BLOCKED}.109.124:443/{random characters}
  • http://{BLOCKED}.{BLOCKED}.150.244:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.140.238:7080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.106.96:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.147.66:8080/{random characters}
  • http://{BLOCKED}.{BLOCKED}.24.231:80/{random characters}