Malware Analysis Report

2024-11-30 11:25

Sample ID 211201-g6mntaadfm
Target 05404a627f0b50208eccd94c35609f16
SHA256 e0120e7987cf2d3cbccd0b18f2857c76f948e4cf42f48cdb1a2f78514627b6d6
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

e0120e7987cf2d3cbccd0b18f2857c76f948e4cf42f48cdb1a2f78514627b6d6

Threat Level: Known bad

The file 05404a627f0b50208eccd94c35609f16 was found to be: Known bad.

Malicious Activity Summary

kutaki keylogger stealer

Kutaki

Kutaki Executable

Kutaki family

Executes dropped EXE

Loads dropped DLL

Drops startup file

Drops file in Windows directory

Enumerates physical storage devices

Modifies Internet Explorer settings

Suspicious use of WriteProcessMemory

Suspicious use of FindShellTrayWindow

Suspicious use of SetWindowsHookEx

Modifies registry class

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-12-01 06:25

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 06:25

Reported

2021-12-01 06:27

Platform

win7-en-20211104

Max time kernel

122s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Tax Pyament 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\gnbudsch.exe N/A

Drops startup file

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

Processes

C:\Users\Admin\AppData\Local\Temp\Tax Pyament Challan.exe

"C:\Users\Admin\AppData\Local\Temp\Tax Pyament Challan.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\gnbudsch.exe

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

C:\Windows\SysWOW64\DllHost.exe

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

Network

N/A

Files

memory/1136-55-0x0000000000220000-0x0000000000226000-memory.dmp

memory/1136-56-0x0000000000220000-0x000000000022A000-memory.dmp

memory/1136-57-0x0000000075981000-0x0000000075983000-memory.dmp

memory/824-58-0x0000000000000000-mapping.dmp

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

MD5 bcd53d5e0cf0449701730264d03659cc
SHA1 3f8e7e422106b9e3a8b0569c8f879c52a5196bde
SHA256 2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4
SHA512 4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

memory/1160-62-0x0000000000000000-mapping.dmp

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

MD5 bcd53d5e0cf0449701730264d03659cc
SHA1 3f8e7e422106b9e3a8b0569c8f879c52a5196bde
SHA256 2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4
SHA512 4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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

MD5 bcd53d5e0cf0449701730264d03659cc
SHA1 3f8e7e422106b9e3a8b0569c8f879c52a5196bde
SHA256 2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4
SHA512 4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

memory/1160-65-0x00000000003B0000-0x00000000003BA000-memory.dmp

memory/1160-64-0x00000000003B0000-0x00000000003B6000-memory.dmp

memory/824-68-0x0000000001FD0000-0x0000000001FD2000-memory.dmp

memory/1284-69-0x0000000000220000-0x0000000000222000-memory.dmp

memory/1284-70-0x0000000000410000-0x0000000000411000-memory.dmp

memory/1160-72-0x0000000003E31000-0x0000000004CDD000-memory.dmp

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

MD5 bcd53d5e0cf0449701730264d03659cc
SHA1 3f8e7e422106b9e3a8b0569c8f879c52a5196bde
SHA256 2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4
SHA512 4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

Analysis: behavioral2

Detonation Overview

Submitted

2021-12-01 06:25

Reported

2021-12-01 06:27

Platform

win10-en-20211104

Max time kernel

126s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Tax Pyament 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\dupdojch.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\dupdojch.exe C:\Users\Admin\AppData\Local\Temp\Tax Pyament Challan.exe N/A
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dupdojch.exe C:\Users\Admin\AppData\Local\Temp\Tax Pyament Challan.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-1-5-21-1042495040-510797905-2613508344-1000_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 Pyament Challan.exe

"C:\Users\Admin\AppData\Local\Temp\Tax Pyament Challan.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\dupdojch.exe

"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dupdojch.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/3340-120-0x0000000000000000-mapping.dmp

memory/1104-121-0x0000000000000000-mapping.dmp

memory/2808-122-0x0000000000000000-mapping.dmp

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

MD5 bcd53d5e0cf0449701730264d03659cc
SHA1 3f8e7e422106b9e3a8b0569c8f879c52a5196bde
SHA256 2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4
SHA512 4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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

MD5 bcd53d5e0cf0449701730264d03659cc
SHA1 3f8e7e422106b9e3a8b0569c8f879c52a5196bde
SHA256 2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4
SHA512 4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

memory/2808-125-0x00000000005A0000-0x00000000005A6000-memory.dmp

memory/2808-126-0x00000000005A0000-0x00000000005AA000-memory.dmp