Malware Analysis Report

2024-11-13 14:55

Sample ID 220724-cstgzsbef6
Target 59f20bfe00956a55cfdf0403942b51d5ee17207eac28e9ea6ea6c6a5840b1ec0
SHA256 59f20bfe00956a55cfdf0403942b51d5ee17207eac28e9ea6ea6c6a5840b1ec0
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

59f20bfe00956a55cfdf0403942b51d5ee17207eac28e9ea6ea6c6a5840b1ec0

Threat Level: Known bad

The file 59f20bfe00956a55cfdf0403942b51d5ee17207eac28e9ea6ea6c6a5840b1ec0 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

Maps connected drives based on registry

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Modifies Internet Explorer settings

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-07-24 02:20

Signatures

Kutaki Executable

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

Kutaki family

kutaki

Analysis: behavioral1

Detonation Overview

Submitted

2022-07-24 02:20

Reported

2022-07-25 10:57

Platform

win7-20220715-en

Max time kernel

150s

Max time network

49s

Command Line

"C:\Users\Admin\AppData\Local\Temp\TDS Challan.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\hyuder.exe N/A

Drops startup file

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

Loads dropped DLL

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

Maps connected drives based on registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe N/A
Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0 C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe N/A

Enumerates physical storage devices

Modifies Internet Explorer settings

adware spyware
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3440072777-2118400376-1759599358-1000\Software\Microsoft\Internet Explorer\Main C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\TDS Challan.exe

"C:\Users\Admin\AppData\Local\Temp\TDS Challan.exe"

C:\Windows\SysWOW64\cmd.exe

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

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

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

Network

N/A

Files

memory/1820-56-0x0000000076C01000-0x0000000076C03000-memory.dmp

memory/1792-57-0x0000000000000000-mapping.dmp

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

MD5 2600b7e78f3a1d996294bcc27b309594
SHA1 a90f63310dca46b419cfcbe95d90e1517932d6d3
SHA256 8b12a088323095e7307e40be4b3194cebd6756d9414d360e06e2015804ad6b58
SHA512 db6926d1cf359712dd7c77b48444f00d0f8ea776cdec752d604a68a3037eadbd38723f50ee655821eda51d21a528c00313e505575816c2ad659856fad886da7b

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

MD5 2600b7e78f3a1d996294bcc27b309594
SHA1 a90f63310dca46b419cfcbe95d90e1517932d6d3
SHA256 8b12a088323095e7307e40be4b3194cebd6756d9414d360e06e2015804ad6b58
SHA512 db6926d1cf359712dd7c77b48444f00d0f8ea776cdec752d604a68a3037eadbd38723f50ee655821eda51d21a528c00313e505575816c2ad659856fad886da7b

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

MD5 2600b7e78f3a1d996294bcc27b309594
SHA1 a90f63310dca46b419cfcbe95d90e1517932d6d3
SHA256 8b12a088323095e7307e40be4b3194cebd6756d9414d360e06e2015804ad6b58
SHA512 db6926d1cf359712dd7c77b48444f00d0f8ea776cdec752d604a68a3037eadbd38723f50ee655821eda51d21a528c00313e505575816c2ad659856fad886da7b

memory/2016-60-0x0000000000000000-mapping.dmp

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

MD5 2600b7e78f3a1d996294bcc27b309594
SHA1 a90f63310dca46b419cfcbe95d90e1517932d6d3
SHA256 8b12a088323095e7307e40be4b3194cebd6756d9414d360e06e2015804ad6b58
SHA512 db6926d1cf359712dd7c77b48444f00d0f8ea776cdec752d604a68a3037eadbd38723f50ee655821eda51d21a528c00313e505575816c2ad659856fad886da7b

Analysis: behavioral2

Detonation Overview

Submitted

2022-07-24 02:20

Reported

2022-07-25 10:57

Platform

win10v2004-20220722-en

Max time kernel

152s

Max time network

127s

Command Line

"C:\Users\Admin\AppData\Local\Temp\TDS Challan.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\hyuder.exe N/A

Drops startup file

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

Maps connected drives based on registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe N/A
Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe N/A

Enumerates physical storage devices

Processes

C:\Users\Admin\AppData\Local\Temp\TDS Challan.exe

"C:\Users\Admin\AppData\Local\Temp\TDS Challan.exe"

C:\Windows\SysWOW64\cmd.exe

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

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

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

Network

Country Destination Domain Proto
US 13.107.4.50:80 tcp

Files

memory/4788-134-0x0000000000000000-mapping.dmp

memory/916-135-0x0000000000000000-mapping.dmp

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

MD5 2600b7e78f3a1d996294bcc27b309594
SHA1 a90f63310dca46b419cfcbe95d90e1517932d6d3
SHA256 8b12a088323095e7307e40be4b3194cebd6756d9414d360e06e2015804ad6b58
SHA512 db6926d1cf359712dd7c77b48444f00d0f8ea776cdec752d604a68a3037eadbd38723f50ee655821eda51d21a528c00313e505575816c2ad659856fad886da7b

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

MD5 2600b7e78f3a1d996294bcc27b309594
SHA1 a90f63310dca46b419cfcbe95d90e1517932d6d3
SHA256 8b12a088323095e7307e40be4b3194cebd6756d9414d360e06e2015804ad6b58
SHA512 db6926d1cf359712dd7c77b48444f00d0f8ea776cdec752d604a68a3037eadbd38723f50ee655821eda51d21a528c00313e505575816c2ad659856fad886da7b