Troyano Ursu

Ursu es un troyano amenazante que se infiltra en su computadora sin su conocimiento o consentimiento, a menudo aprovechando las vulnerabilidades del sistema y las fallas de seguridad. Se puede descargar de sitios web corruptos o archivos adjuntos de correo electrónico de fuentes no confiables. Los archivos armados pueden ser de varios tipos diferentes, como archivos .exe, .pif, .avi e incluso .jpg.

Una vez instalado, Ursu permanece oculto en segundo plano y probablemente realizará varias funciones dañinas que permitirán a los actores de amenazas obtener un control total sobre el sistema de la víctima. Las capacidades amenazantes del troyano Ursu pueden incluir la eliminación de archivos, la instalación de malware adicional, la recopilación de contraseñas, el cambio de la configuración del sistema y el control de la actividad de la computadora. Como Ursu no tiene la capacidad de replicarse a sí mismo, los usuarios de computadoras deben tomar medidas para proteger sus máquinas contra él y evitar su instalación en sus computadoras.

Qué tan dañinas son las amenazas como el troyano Ursu

Una amenaza troyana es malware que podría inyectarse o disfrazarse de software o archivos legítimos, que generalmente se propaga a través del uso compartido de archivos, descargas o correos electrónicos. Una vez dentro de su computadora, puede causar daños al deshabilitar las funciones del sistema, secuestrar información personal, acceder a otros dispositivos conectados a la red o proporcionar a sus operadores acceso remoto al dispositivo violado.

Por lo general, los troyanos se utilizan para dar acceso a los piratas informáticos al dispositivo de un usuario, tomar el control de sus recursos y abrir oportunidades para nuevos ataques, como ransomware y robo de datos. En algunos casos, los piratas informáticos los implementan para crear ataques de denegación de servicio distribuido (DDoS) en redes y sitios web. Alternativamente, pueden usarse para instalar software amenazante adicional en las PC, como registradores de pulsaciones de teclas, criptomineros, etc.

¿Cómo evitar los ataques del troyano Ursu?

Mantener todos los programas instalados actualizados ayuda a protegerse contra las vulnerabilidades de seguridad a las que apuntan los atacantes. Esto se aplica no solo a su sistema operativo, sino también a cualquier aplicación que pueda tener, como navegadores o clientes de correo electrónico. La copia de seguridad rutinaria de los datos esenciales podría proporcionar una manera fácil de restaurar los datos perdidos en caso de que suceda algo debido a los efectos de una herramienta dañina que se infiltra en su máquina.

También es fundamental tener siempre cuidado al hacer clic en enlaces enviados a través de correos electrónicos no solicitados; esta táctica suele ser empleada por atacantes que intentan engañar a los usuarios para que descarguen archivos dañados. Si recibe correos electrónicos sospechosos que contienen archivos adjuntos de remitentes desconocidos, trate de no interactuar con ellos hasta que haya logrado verificar la legitimidad de sus remitentes.

Reporte de análisis

Información general

Family Name:	Trojan.Ursu.A
Signature status:	No Signature

Known Samples

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Known Samples

This section lists other file samples believed to be associated with this family.

MD5: 05028cb6c42afa3c0f88162fa4ed96cd SHA1: f89be7fece20f436fd5552e904f971b0bcde99e3 SHA256: 4505DFE008D464402C753E1C1FCF1E4EB5D1B486E52BF67FFBE525148383E6E2 Tamaño del archivo: 740.86 KB, 740864 bytes

MD5: afc6d2ec749317227235b3c951971f0f SHA1: 9e4b676c8eb3afff6966537534693d1f36dab1e4 SHA256: E935C660D03DD8F022FAB4870E984595D33D78690BAB7CEEABB34CB121A30A6E Tamaño del archivo: 13.31 KB, 13312 bytes

Windows Portable Executable Attributes

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Windows Portable Executable Attributes

This section lists file attributes found within family samples. These attributes are extracted from the files’ Windows PE (Portable Executable) specification and various system flags. Portable Executable Attributes give malware researchers insight into a file’s functionality, executable details, platform and runtime environment.

• File doesn't have "Rich" header
• File doesn't have debug information
• File doesn't have exports table
• File doesn't have security information
• File is .NET application
• File is 32-bit executable
• File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
• File is either console or GUI application
• File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
• File is Native application (NOT .NET application)

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• File is not packed
• IMAGE_FILE_DLL is not set inside PE header (Executable)
• IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Icons

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File Icons

This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.

Windows PE Version Information

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Windows PE Version Information

This section displays values and attributes that have been set in the Windows file version information data structure for samples within this family. To mislead users, malware actors often add fake version information mimicking legitimate software.

Nombre	Valor
Assembly Version	1.0.0.0
Company Name	Microsoft Corporation
File Description	DisableWD Win32 Cabinet Self-Extractor Самоизвлечение CAB-файлов Win32
File Version	11.00.17763.1 (WinBuild.160101.0800) 1.0.0.0
Internal Name	DisableWD.dll Wextract
Legal Copyright	Copyright © 2021 © Microsoft Corporation. All rights reserved. © Корпорация Майкрософт. Все права защищены.
Original Filename	DisableWD.dll WEXTRACT.EXE .MUI
Product Name	DisableWD Internet Explorer
Product Version	11.00.17763.1 1.0.0.0

File Traits

• .NET
• dll
• x86

Block Information

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Block Information

During analysis, EnigmaSoft breaks file samples into logical blocks for classification and comparison with other samples. Blocks can be used to generate malware detection rules and to group file samples into families based on shared source code, functionality and other distinguishing attributes and characteristics. This section lists a summary of this block data, as well as its classification by EnigmaSoft. A visual representation of the block data is also displayed, where available.

Total Blocks:	22
Potentially Malicious Blocks:	3
Whitelisted Blocks:	17
Unknown Blocks:	2

Visual Map

0 0 0 0 0 0 0 0 0 0 ? x ? x x 0 0 0 0 0 0 0

0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

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Similar Families

This section lists other families that share similarities with this family, based on EnigmaSoft’s analysis. Many malware families are created from the same malware toolkits and use the same packing and encryption techniques but uniquely extend functionality. Similar families may also share source code, attributes, icons, subcomponents, compromised and/or invalid digital signatures, and network characteristics. Researchers leverage these similarities to rapidly and effectively triage file samples and extend malware detection rules.

• MSIL.Gamehack.OS
• MSIL.Kryptik.AR
• MSIL.Rozena.GG

Files Modified

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Files Modified

This section lists files that were created, modified, moved and/or deleted by samples in this family. File system activity can provide valuable insight into how malware functions on the operating system.

File	Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\rmm41wz.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\rmm41wz.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\sgt41kb.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\sgt41kb.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete
c:\users\user\appdata\local\temp\ixp001.tmp\noi55bm.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\noi55bm.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\seb00mz.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\seb00mz.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete

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c:\users\user\appdata\local\temp\ixp002.tmp\kyo67cp.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\kyo67cp.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\mti66.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\mti66.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete

Registry Modifications

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Registry Modifications

This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.

Key::Value	Datos	API Name
HKLM\software\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup0	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Ygrbwppu\AppData\Local\Temp\IXP000.TMP\"	RegNtPreCreateKey
HKLM\software\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup1	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Ygrbwppu\AppData\Local\Temp\IXP001.TMP\"	RegNtPreCreateKey
HKLM\software\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup2	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Ygrbwppu\AppData\Local\Temp\IXP002.TMP\"	RegNtPreCreateKey

Windows API Usage

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Windows API Usage

This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.

Category	API
Process Manipulation Evasion	NtUnmapViewOfSection
Process Shell Execute	CreateProcess
User Data Access	GetUserDefaultLocaleName GetUserObjectInformation
Encryption Used	BCryptOpenAlgorithmProvider
Anti Debug	NtQuerySystemInformation
Syscall Use	ntdll.dll!NtAccessCheck ntdll.dll!NtAlpcSendWaitReceivePort ntdll.dll!NtApphelpCacheControl ntdll.dll!NtClose ntdll.dll!NtConnectPort ntdll.dll!NtCreateMutant ntdll.dll!NtCreateSection ntdll.dll!NtDuplicateToken ntdll.dll!NtFreeVirtualMemory ntdll.dll!NtMapViewOfSection Show More ntdll.dll!NtOpenFile ntdll.dll!NtOpenKey ntdll.dll!NtOpenKeyEx ntdll.dll!NtOpenProcessToken ntdll.dll!NtOpenProcessTokenEx ntdll.dll!NtOpenSection ntdll.dll!NtOpenSemaphore ntdll.dll!NtOpenThreadTokenEx ntdll.dll!NtProtectVirtualMemory ntdll.dll!NtQueryAttributesFile ntdll.dll!NtQueryDebugFilterState ntdll.dll!NtQueryInformationProcess ntdll.dll!NtQueryInformationThread ntdll.dll!NtQueryInformationToken ntdll.dll!NtQueryKey ntdll.dll!NtQueryPerformanceCounter ntdll.dll!NtQuerySecurityAttributesToken ntdll.dll!NtQueryValueKey ntdll.dll!NtQueryVirtualMemory ntdll.dll!NtQueryVolumeInformationFile ntdll.dll!NtQueryWnfStateData ntdll.dll!NtReleaseMutant ntdll.dll!NtReleaseSemaphore ntdll.dll!NtReleaseWorkerFactoryWorker ntdll.dll!NtRequestWaitReplyPort ntdll.dll!NtSetEvent ntdll.dll!NtSetInformationProcess ntdll.dll!NtSetInformationVirtualMemory ntdll.dll!NtSetInformationWorkerFactory ntdll.dll!NtSubscribeWnfStateChange ntdll.dll!NtTestAlert ntdll.dll!NtTraceControl ntdll.dll!NtUnmapViewOfSection ntdll.dll!NtUnmapViewOfSectionEx ntdll.dll!NtWaitForSingleObject ntdll.dll!NtWaitLowEventPair ntdll.dll!NtWriteFile UNKNOWN

Shell Command Execution

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Shell Command Execution

This section lists Windows shell commands that are run by the samples in this family. Windows Shell commands are often leveraged by malware for nefarious purposes and can be used to elevate security privileges, download and launch other malware, exploit vulnerabilities, collect and exfiltrate data, and hide malicious activity.

C:\Users\Ygrbwppu\AppData\Local\Temp\IXP000.TMP\sgt41Kb.exe

C:\Users\Ygrbwppu\AppData\Local\Temp\IXP001.TMP\sEB00mZ.exe

C:\Users\Ygrbwppu\AppData\Local\Temp\IXP002.TMP\kYo67Cp.exe