Ursu Trojan

Ursu je prijeteći trojanac koji se infiltrira u vaše računalo bez vašeg znanja ili pristanka, često iskorištavajući ranjivosti sustava i sigurnosne propuste. Može se preuzeti s oštećenih web stranica ili privitaka e-pošte iz nepouzdanih izvora. Oružane datoteke mogu biti različitih vrsta, kao što su .exe, .pif, .avi pa čak i .jpg datoteke.

Jednom instaliran, Ursu ostaje skriven u pozadini i vjerojatno će obavljati razne štetne funkcije koje akterima prijetnji omogućuju da steknu potpunu kontrolu nad žrtvinim sustavom. Prijeteće mogućnosti trojanca Ursu mogu uključivati brisanje datoteka, instaliranje dodatnog zlonamjernog softvera, prikupljanje lozinki, promjenu postavki sustava i praćenje aktivnosti računala. Kako Ursu nema mogućnost repliciranja samog sebe, korisnici računala trebaju poduzeti mjere da zaštite svoje strojeve od njega kako bi spriječili njegovu instalaciju na svoja računala.

Koliko su štetne prijetnje poput trojanca Ursu

Trojanska prijetnja je zlonamjerni softver koji se može ubaciti ili maskirati u legitiman softver ili datoteke, a koji se obično širi putem dijeljenja datoteka, preuzimanja ili e-pošte. Jednom kada uđe u vaše računalo, može prouzročiti štetu onemogućavanjem funkcija sustava, otimanjem osobnih podataka, pristupom drugim uređajima povezanim na mrežu ili pružanjem svojim operaterima daljinskog pristupa oštećenom uređaju.

Trojanci se obično koriste kako bi hakerima dali pristup korisnikovom uređaju, preuzimajući kontrolu nad njegovim resursima i otvarajući mogućnosti za daljnje napade, kao što su ransomware i krađa podataka. U nekim ih slučajevima koriste hakeri kako bi stvorili distribuirane napade uskraćivanja usluge (DDoS) na mreže i web stranice. Alternativno, mogu se koristiti za instaliranje dodatnog prijetećeg softvera na računala, kao što su keyloggeri, kripto rudari itd.

Kako izbjeći napade trojanca Ursu?

Održavanje svih instaliranih programa ažurnim pomaže u zaštiti od sigurnosnih propusta na meti napadača. Ovo se ne odnosi samo na vaš operativni sustav već i na sve aplikacije koje možda imate, kao što su preglednici ili klijenti e-pošte. Rutinsko sigurnosno kopiranje bitnih podataka moglo bi pružiti jednostavan način vraćanja izgubljenih podataka u slučaju da se nešto dogodi zbog učinaka štetnog alata koji se infiltrirao u vaš stroj.

Također je ključno uvijek biti oprezan kada klikate veze poslane putem neželjene e-pošte – ovu taktiku često koriste napadači koji pokušavaju prevariti korisnike da preuzmu oštećene datoteke. Ako primite sumnjivu e-poštu koja sadrži privitke od nepoznatih pošiljatelja, pokušajte ne komunicirati s njima dok ne uspijete provjeriti legitimnost njihovih pošiljatelja.

Izvješće o analizi

Opće informacije

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 Veličina datoteke: 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.

Ime	Vrijednost
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	Podaci	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