Ursu Trojan

Ursu je nevaren trojanec, ki se infiltrira v vaš računalnik brez vaše vednosti ali privolitve, pogosto z izkoriščanjem sistemskih ranljivosti in varnostnih napak. Prenesete ga lahko s poškodovanih spletnih mest ali e-poštnih prilog iz nezaupljivih virov. Datoteke z orožjem so lahko različnih vrst, kot so datoteke .exe, .pif, .avi in celo .jpg.

Ko je nameščen, Ursu ostane skrit v ozadju in bo verjetno izvajal različne škodljive funkcije, ki akterjem groženj omogočajo popoln nadzor nad sistemom žrtve. Nevarne zmožnosti trojanca Ursu lahko vključujejo brisanje datotek, namestitev dodatne zlonamerne programske opreme, zbiranje gesel, spreminjanje sistemskih nastavitev in spremljanje dejavnosti računalnika. Ker se Ursu ne more razmnoževati, morajo uporabniki računalnikov sprejeti ukrepe za zaščito svojih strojev pred njim, da preprečijo njegovo namestitev v svoje računalnike.

Kako škodljive so grožnje, kot je trojanec Ursu

Trojanska grožnja je zlonamerna programska oprema, ki jo je mogoče vnesti v zakonito programsko opremo ali datoteke ali jih prikriti, ki se običajno širi prek skupne rabe datotek, prenosov ali e-pošte. Ko je v vašem računalniku, lahko povzroči škodo tako, da onemogoči sistemske funkcije, ugrabi osebne podatke, dostopa do drugih naprav, povezanih z omrežjem, ali svojim operaterjem omogoči oddaljeni dostop do naprave, ki je bila poškodovana.

Običajno se trojanci uporabljajo, da hekerjem omogočijo dostop do uporabnikove naprave, prevzamejo nadzor nad njenimi viri in odprejo možnosti za nadaljnje napade, kot sta izsiljevalska programska oprema in kraja podatkov. V nekaterih primerih jih uporabijo hekerji, da ustvarijo napade porazdeljene zavrnitve storitve (DDoS) na omrežja in spletna mesta. Namesto tega se lahko uporabijo za namestitev dodatne nevarne programske opreme na osebne računalnike, kot so zapisovalniki tipk, kripto rudarji itd.

Kako se izogniti napadom trojanca Ursu?

Posodabljanje vseh nameščenih programov pomaga pri zaščiti pred varnostnimi ranljivostmi, ki so tarča napadalcev. To ne velja le za vaš operacijski sistem, ampak tudi za vse aplikacije, ki jih morda imate, kot so brskalniki ali e-poštni odjemalci. Rutinsko varnostno kopiranje bistvenih podatkov bi lahko zagotovilo preprost način za obnovitev izgubljenih podatkov v primeru, da se kaj zgodi zaradi učinkov škodljivega orodja, ki se infiltrira v vaš računalnik.

Prav tako je ključnega pomena, da ste vedno previdni pri klikanju povezav, poslanih prek nezaželene e-pošte – to taktiko pogosto uporabljajo napadalci, ki poskušajo uporabnike zavesti, da prenesejo poškodovane datoteke. Če prejmete sumljiva e-poštna sporočila s priponkami od neznanih pošiljateljev, ne komunicirajte z njimi, dokler ne preverite legitimnosti njihovih pošiljateljev.

Poročilo o analizi

Splošne 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 Velikost 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	vrednost
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	Podatki	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