Ursu Trojan

Ursu ialah Trojan mengancam yang menyusup ke komputer anda tanpa pengetahuan atau persetujuan anda, selalunya dengan mengeksploitasi kelemahan sistem dan kelemahan keselamatan. Ia boleh dimuat turun daripada tapak web yang rosak atau lampiran e-mel daripada sumber yang tidak dipercayai. Fail bersenjata boleh daripada pelbagai jenis, seperti fail .exe, .pif, .avi dan juga .jpg.

Setelah dipasang, Ursu kekal tersembunyi di latar belakang dan berkemungkinan akan melaksanakan pelbagai fungsi berbahaya yang membolehkan pelaku ancaman mendapat kawalan sepenuhnya ke atas sistem mangsa. Keupayaan mengancam Trojan Ursu mungkin termasuk memadam fail, memasang perisian hasad tambahan, mengumpul kata laluan, menukar tetapan sistem dan memantau aktiviti komputer. Memandangkan Ursu tidak mempunyai keupayaan untuk meniru dirinya sendiri, pengguna komputer perlu mengambil langkah untuk melindungi mesin mereka daripadanya untuk menghalang pemasangannya pada komputer mereka.

Betapa Berbahayanya Ancaman Seperti Trojan Ursu

Ancaman Trojan ialah perisian hasad yang boleh disuntik ke dalam atau menyamar sebagai perisian atau fail yang sah, yang biasanya disebarkan melalui perkongsian fail, muat turun atau e-mel. Apabila berada di dalam komputer anda, ia boleh menyebabkan kerosakan dengan melumpuhkan fungsi sistem, merampas maklumat peribadi, mengakses peranti lain yang disambungkan ke rangkaian atau memberikan pengendalinya akses jauh kepada peranti yang dilanggar.

Lazimnya, Trojan digunakan untuk memberi penggodam akses kepada peranti pengguna, mengawal sumbernya dan membuka peluang untuk serangan selanjutnya, seperti perisian tebusan dan kecurian data. Dalam sesetengah kes, ia digunakan oleh penggodam untuk membuat serangan Penafian Perkhidmatan (DDoS) Teragih pada rangkaian dan tapak web. Sebagai alternatif, ia boleh digunakan untuk memasang perisian ancaman tambahan pada PC, seperti keylogger, pelombong kripto, dsb.

Bagaimana untuk Mengelakkan Serangan Trojan Ursu?

Memastikan semua program yang dipasang dikemas kini membantu melindungi daripada kelemahan keselamatan yang disasarkan oleh penyerang. Ini terpakai bukan sahaja pada sistem pengendalian anda tetapi juga pada mana-mana aplikasi yang mungkin anda miliki, seperti penyemak imbas atau klien e-mel. Menyandarkan data penting secara berkala boleh menyediakan cara mudah untuk memulihkan data yang hilang sekiranya sesuatu berlaku disebabkan oleh kesan alat berbahaya yang menyusup ke mesin anda.

Ia juga penting untuk sentiasa berhati-hati apabila mengklik pautan yang dihantar melalui e-mel yang tidak diminta - taktik ini sering digunakan oleh penyerang yang cuba menipu pengguna untuk memuat turun fail yang rosak. Jika anda menerima e-mel yang mencurigakan yang mengandungi lampiran daripada pengirim yang tidak dikenali, cuba jangan berinteraksi dengan mereka sehingga anda berjaya mengesahkan kesahihan penghantar mereka.

Laporan Analisis

Maklumat am

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 Saiz fail: 740.86 KB, 740864 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 exports table
• File doesn't have security information
• File is 32-bit executable
• File is either console or GUI application
• File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
• File is Native application (NOT .NET application)
• 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.

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

File Traits

• .NET
• x86

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

Show More

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	Data	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

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