Malware Analysis Report

2024-11-30 11:26

Sample ID 211201-k83dtsebh3
Target 0580c88e5ec1b9a64b1cdf8aa20d1886
SHA256 d7d03d5c9764d32560fbd5b0cdbae78d61cdf66ae7f81031fb1505d355fc978c
Tags
kutaki keylogger stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

d7d03d5c9764d32560fbd5b0cdbae78d61cdf66ae7f81031fb1505d355fc978c

Threat Level: Known bad

The file 0580c88e5ec1b9a64b1cdf8aa20d1886 was found to be: Known bad.

Malicious Activity Summary

kutaki keylogger stealer

Kutaki Executable

Kutaki family

Kutaki

Executes dropped EXE

Loads dropped DLL

Drops startup file

Drops file in Windows directory

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Modifies registry class

Modifies Internet Explorer settings

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-12-01 09:17

Signatures

Kutaki Executable

Description Indicator Process Target
N/A N/A N/A N/A

Kutaki family

kutaki

Analysis: behavioral1

Detonation Overview

Submitted

2021-12-01 09:17

Reported

2021-12-01 09:19

Platform

win7-en-20211104

Max time kernel

150s

Max time network

119s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe"

Signatures

Kutaki

stealer keylogger kutaki

Kutaki Executable

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A

Drops startup file

Description Indicator Process Target
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A

Enumerates physical storage devices

Modifies Internet Explorer settings

adware spyware
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-103686315-404690609-2047157615-1000\Software\Microsoft\Internet Explorer\Main C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\DllHost.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe

"C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe"

C:\Windows\SysWOW64\cmd.exe

cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe"

C:\Windows\SysWOW64\DllHost.exe

C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}

Network

N/A

Files

memory/672-55-0x0000000000220000-0x0000000000226000-memory.dmp

memory/672-56-0x0000000000220000-0x000000000022A000-memory.dmp

memory/672-57-0x0000000076A21000-0x0000000076A23000-memory.dmp

memory/552-58-0x0000000000000000-mapping.dmp

\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

MD5 ea8ff94f74983ea0fe9f96f4df50850b
SHA1 f1bd1b5edae636b45833d3c080a65c7cf3b47ed6
SHA256 991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b
SHA512 6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

MD5 ea8ff94f74983ea0fe9f96f4df50850b
SHA1 f1bd1b5edae636b45833d3c080a65c7cf3b47ed6
SHA256 991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b
SHA512 6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

memory/1004-62-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

MD5 ea8ff94f74983ea0fe9f96f4df50850b
SHA1 f1bd1b5edae636b45833d3c080a65c7cf3b47ed6
SHA256 991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b
SHA512 6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

memory/552-68-0x0000000000680000-0x0000000000682000-memory.dmp

memory/1604-69-0x0000000000120000-0x0000000000122000-memory.dmp

memory/1604-70-0x0000000000240000-0x0000000000241000-memory.dmp

memory/1004-71-0x0000000003F41000-0x0000000004DED000-memory.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

MD5 ea8ff94f74983ea0fe9f96f4df50850b
SHA1 f1bd1b5edae636b45833d3c080a65c7cf3b47ed6
SHA256 991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b
SHA512 6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

Analysis: behavioral2

Detonation Overview

Submitted

2021-12-01 09:17

Reported

2021-12-01 09:19

Platform

win10-en-20211014

Max time kernel

142s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe"

Signatures

Kutaki

stealer keylogger kutaki

Kutaki Executable

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Debug\WIA\wiatrace.log C:\Windows\SysWOW64\mspaint.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000_Classes\Local Settings C:\Windows\SysWOW64\cmd.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\mspaint.exe N/A
N/A N/A C:\Windows\SysWOW64\mspaint.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe

"C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe"

C:\Windows\SysWOW64\cmd.exe

cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp

C:\Windows\SysWOW64\mspaint.exe

"C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp"

\??\c:\windows\system32\svchost.exe

c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe

"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 time.windows.com udp
NL 20.101.57.9:123 time.windows.com udp

Files

memory/3028-118-0x00000000001E0000-0x00000000001E6000-memory.dmp

memory/3028-119-0x00000000001E0000-0x00000000001EA000-memory.dmp

memory/2908-120-0x0000000000000000-mapping.dmp

memory/2316-121-0x0000000000000000-mapping.dmp

memory/1280-122-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe

MD5 ea8ff94f74983ea0fe9f96f4df50850b
SHA1 f1bd1b5edae636b45833d3c080a65c7cf3b47ed6
SHA256 991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b
SHA512 6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe

MD5 ea8ff94f74983ea0fe9f96f4df50850b
SHA1 f1bd1b5edae636b45833d3c080a65c7cf3b47ed6
SHA256 991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b
SHA512 6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

memory/1280-125-0x00000000004C0000-0x00000000004C6000-memory.dmp

memory/1280-126-0x00000000004C0000-0x00000000004CA000-memory.dmp