Malware Analysis Report

2024-11-30 11:26

Sample ID 211205-edj14seff7
Target a11c8cf414a15f2eb0cefae6b3f31a8f
SHA256 ec03481d3d9ea7124698ca24630f4495d086feaa8a0b0750ac7f5854eebceecc
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

ec03481d3d9ea7124698ca24630f4495d086feaa8a0b0750ac7f5854eebceecc

Threat Level: Known bad

The file a11c8cf414a15f2eb0cefae6b3f31a8f was found to be: Known bad.

Malicious Activity Summary

kutaki keylogger stealer

Kutaki Executable

Kutaki

Kutaki family

Executes dropped EXE

Drops startup file

Loads dropped DLL

Drops file in Windows directory

Enumerates physical storage devices

Modifies Internet Explorer settings

Suspicious use of SetWindowsHookEx

Suspicious behavior: EnumeratesProcesses

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

Modifies registry class

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-12-05 03:49

Signatures

Kutaki Executable

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

Kutaki family

kutaki

Analysis: behavioral1

Detonation Overview

Submitted

2021-12-05 03:49

Reported

2021-12-05 03:51

Platform

win7-en-20211014

Max time kernel

120s

Max time network

119s

Command Line

"C:\Users\Admin\AppData\Local\Temp\image.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\wwkbyfch.exe N/A

Drops startup file

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

Loads dropped DLL

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

Enumerates physical storage devices

Modifies Internet Explorer settings

adware spyware
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2955169046-2371869340-1800780948-1000\Software\Microsoft\Internet Explorer\Main C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.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\image.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\image.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\image.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\wwkbyfch.exe N/A

Processes

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

"C:\Users\Admin\AppData\Local\Temp\image.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\wwkbyfch.exe

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

C:\Windows\SysWOW64\DllHost.exe

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

Network

N/A

Files

memory/460-55-0x0000000000220000-0x0000000000226000-memory.dmp

memory/460-56-0x0000000000220000-0x000000000022A000-memory.dmp

memory/460-57-0x0000000075B71000-0x0000000075B73000-memory.dmp

memory/328-58-0x0000000000000000-mapping.dmp

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

MD5 41272cf867595eea4c729a1e3d2c97f4
SHA1 1ee33f8015955ba97e422c6e7fa55949706dcc90
SHA256 0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03
SHA512 140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

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

MD5 41272cf867595eea4c729a1e3d2c97f4
SHA1 1ee33f8015955ba97e422c6e7fa55949706dcc90
SHA256 0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03
SHA512 140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

memory/1180-62-0x0000000000000000-mapping.dmp

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

MD5 41272cf867595eea4c729a1e3d2c97f4
SHA1 1ee33f8015955ba97e422c6e7fa55949706dcc90
SHA256 0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03
SHA512 140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

memory/1180-64-0x00000000001B0000-0x00000000001B6000-memory.dmp

memory/1180-65-0x00000000001B0000-0x00000000001BA000-memory.dmp

memory/328-68-0x00000000022A0000-0x00000000022A2000-memory.dmp

memory/1768-69-0x00000000001E0000-0x00000000001E2000-memory.dmp

memory/1768-70-0x00000000002C0000-0x00000000002C1000-memory.dmp

memory/1180-71-0x0000000003DD1000-0x0000000004C7D000-memory.dmp

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

MD5 41272cf867595eea4c729a1e3d2c97f4
SHA1 1ee33f8015955ba97e422c6e7fa55949706dcc90
SHA256 0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03
SHA512 140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

Analysis: behavioral2

Detonation Overview

Submitted

2021-12-05 03:49

Reported

2021-12-05 03:52

Platform

win10-en-20211104

Max time kernel

124s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\image.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\pvffkich.exe N/A

Drops startup file

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

"C:\Users\Admin\AppData\Local\Temp\image.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\pvffkich.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 time.windows.com udp
US 168.61.215.74:123 time.windows.com udp

Files

memory/3964-120-0x0000000000000000-mapping.dmp

memory/1184-121-0x0000000000000000-mapping.dmp

memory/1440-122-0x0000000000000000-mapping.dmp

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

MD5 41272cf867595eea4c729a1e3d2c97f4
SHA1 1ee33f8015955ba97e422c6e7fa55949706dcc90
SHA256 0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03
SHA512 140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

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

MD5 41272cf867595eea4c729a1e3d2c97f4
SHA1 1ee33f8015955ba97e422c6e7fa55949706dcc90
SHA256 0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03
SHA512 140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

memory/1440-125-0x00000000001D0000-0x00000000001D6000-memory.dmp

memory/1440-126-0x00000000001D0000-0x00000000001DA000-memory.dmp