Ursu Trojan

Ursu er en truende trojaner, der infiltrerer din computer uden din viden eller samtykke, ofte ved at udnytte systemets sårbarheder og sikkerhedsfejl. Det kan downloades fra beskadigede websteder eller vedhæftede e-mails fra upålidelige kilder. De bevæbnede filer kan være fra forskellige typer, såsom .exe-, .pif-, .avi- og endda .jpg-filer.

Når først den er installeret, forbliver Ursu skjult i baggrunden og vil sandsynligvis udføre forskellige skadelige funktioner, der tillader trusselsaktører at få fuldstændig kontrol over ofrets system. Ursu-trojanerens truende egenskaber kan omfatte sletning af filer, installation af yderligere malware, indsamling af adgangskoder, ændring af systemindstillinger og overvågning af computeraktiviteten. Da Ursu ikke har evnen til at replikere sig selv, skal computerbrugere træffe foranstaltninger for at beskytte deres maskiner mod det for at forhindre installationen på deres computere.

Hvor skadelige er trusler som Ursu-trojaneren

En trojansk trussel er malware, der kan injiceres i eller forklædt som legitim software eller filer, som normalt spredes via fildeling, downloads eller e-mails. Når den først er inde i din computer, kan den forårsage skade ved at deaktivere systemfunktioner, kapre personlige oplysninger, få adgang til andre enheder, der er tilsluttet netværket, eller give dens operatører fjernadgang til den ødelagte enhed.

Typisk bruges trojanske heste til at give hackere adgang til en brugers enhed, tage kontrol over dens ressourcer og åbne muligheder for yderligere angreb, såsom ransomware og datatyveri. I nogle tilfælde bliver de indsat af hackere til at skabe DDoS-angreb (Distributed Denial-of-Service) på netværk og websteder. Alternativt kan de bruges til at installere yderligere truende software på pc'er, såsom keyloggers, crypto-miners osv.

Hvordan undgår man Ursu-trojanske angreb?

Ved at holde alle installerede programmer opdaterede hjælper det med at beskytte mod sikkerhedssårbarheder målrettet af angribere. Dette gælder ikke kun for dit operativsystem, men også for alle applikationer, du måtte have, såsom browsere eller e-mail-klienter. Rutinemæssig sikkerhedskopiering af væsentlige data kan give en nem måde at gendanne tabte data, hvis der sker noget på grund af virkningerne af et skadeligt værktøj, der infiltrerer din maskine.

Det er også afgørende altid at være forsigtig, når du klikker på links sendt gennem uopfordrede e-mails - denne taktik bruges ofte af angribere, der forsøger at narre brugere til at downloade beskadigede filer. Hvis du modtager mistænkelige e-mails, der indeholder vedhæftede filer fra ukendte afsendere, så prøv ikke at interagere med dem, før du har formået at bekræfte deres afsenderes legitimitet.

Analyserapport

Generel information

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 Filstørrelse: 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.

Navn	Værdi
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