Malware Analysis Report

2024-11-15 07:18

Sample ID 220701-htb7zsafa7
Target bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
SHA256 bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
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

bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09

Threat Level: Known bad

The file bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09 was found to be: Known bad.

Malicious Activity Summary

kutaki keylogger stealer

Kutaki family

Kutaki

Kutaki Executable

Executes dropped EXE

Drops startup file

Loads dropped DLL

Maps connected drives based on registry

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-07-01 07:01

Signatures

Kutaki Executable

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

Kutaki family

kutaki

Analysis: behavioral1

Detonation Overview

Submitted

2022-07-01 07:01

Reported

2022-07-01 08:24

Platform

win7-20220414-en

Max time kernel

73s

Max time network

39s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.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

Executes dropped EXE

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

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.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\gxrskuch.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\gxrskuch.exe N/A

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1976 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Windows\SysWOW64\cmd.exe
PID 1976 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Windows\SysWOW64\cmd.exe
PID 1976 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Windows\SysWOW64\cmd.exe
PID 1976 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Windows\SysWOW64\cmd.exe
PID 1976 wrote to memory of 1528 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe
PID 1976 wrote to memory of 1528 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe
PID 1976 wrote to memory of 1528 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe
PID 1976 wrote to memory of 1528 N/A C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gxrskuch.exe

Processes

C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe

"C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.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\gxrskuch.exe

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

Network

N/A

Files

memory/1976-56-0x00000000757C1000-0x00000000757C3000-memory.dmp

memory/1304-57-0x0000000000000000-mapping.dmp

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

MD5 3acd878dcad8af0f84eae82ae801b654
SHA1 14931b89a4adada1d61e9aa3d437ce74045898ce
SHA256 bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
SHA512 934131e128f7ed31b92e7340100b6a50d1fa40482c3ea8fbff91f21cc6718fc7cc66eaf235d5746d51ba22872a499c1f659c69477bf07f3d60ac1bb6a74075c6

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

MD5 3acd878dcad8af0f84eae82ae801b654
SHA1 14931b89a4adada1d61e9aa3d437ce74045898ce
SHA256 bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
SHA512 934131e128f7ed31b92e7340100b6a50d1fa40482c3ea8fbff91f21cc6718fc7cc66eaf235d5746d51ba22872a499c1f659c69477bf07f3d60ac1bb6a74075c6

memory/1528-60-0x0000000000000000-mapping.dmp

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

MD5 3acd878dcad8af0f84eae82ae801b654
SHA1 14931b89a4adada1d61e9aa3d437ce74045898ce
SHA256 bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
SHA512 934131e128f7ed31b92e7340100b6a50d1fa40482c3ea8fbff91f21cc6718fc7cc66eaf235d5746d51ba22872a499c1f659c69477bf07f3d60ac1bb6a74075c6

Analysis: behavioral2

Detonation Overview

Submitted

2022-07-01 07:01

Reported

2022-07-01 08:25

Platform

win10v2004-20220414-en

Max time kernel

153s

Max time network

168s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.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\dvklybch.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvklybch.exe C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvklybch.exe C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.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\dvklybch.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\dvklybch.exe N/A

Enumerates physical storage devices

Processes

C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.exe

"C:\Users\Admin\AppData\Local\Temp\bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09.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\dvklybch.exe

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

Network

Country Destination Domain Proto
US 93.184.220.29:80 tcp
US 93.184.220.29:80 tcp
NL 52.178.17.2:443 tcp
IE 20.54.89.106:443 tcp
NL 104.110.191.140:80 tcp
NL 104.110.191.140:80 tcp
NL 104.110.191.140:80 tcp
US 93.184.220.29:80 tcp
US 52.152.108.96:443 tcp
US 8.8.8.8:53 15.89.54.20.in-addr.arpa udp
US 8.8.8.8:53 9.9.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.3.0.4.0.0.3.0.1.3.0.6.2.ip6.arpa udp

Files

memory/4248-132-0x0000000000000000-mapping.dmp

memory/4416-133-0x0000000000000000-mapping.dmp

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

MD5 3acd878dcad8af0f84eae82ae801b654
SHA1 14931b89a4adada1d61e9aa3d437ce74045898ce
SHA256 bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
SHA512 934131e128f7ed31b92e7340100b6a50d1fa40482c3ea8fbff91f21cc6718fc7cc66eaf235d5746d51ba22872a499c1f659c69477bf07f3d60ac1bb6a74075c6

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

MD5 3acd878dcad8af0f84eae82ae801b654
SHA1 14931b89a4adada1d61e9aa3d437ce74045898ce
SHA256 bf51b56b57a92f9c4593337428209f032afa0b4df571190f99e4368415e42a09
SHA512 934131e128f7ed31b92e7340100b6a50d1fa40482c3ea8fbff91f21cc6718fc7cc66eaf235d5746d51ba22872a499c1f659c69477bf07f3d60ac1bb6a74075c6