Malware Analysis Report

2024-11-13 14:55

Sample ID 220725-r3gy9sfaaq
Target 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
Tags
kutaki keylogger stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c

Threat Level: Known bad

The file 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c 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

Maps connected drives based on registry

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Modifies Internet Explorer settings

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-07-25 14:42

Signatures

Kutaki Executable

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

Kutaki family

kutaki

Analysis: behavioral2

Detonation Overview

Submitted

2022-07-25 14:42

Reported

2022-07-25 14:45

Platform

win10v2004-20220721-en

Max time kernel

152s

Max time network

147s

Command Line

"C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe

"C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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
IE 40.126.31.69:443 tcp
US 8.252.118.126:80 tcp
US 67.24.171.254:80 tcp
US 67.24.171.254:80 tcp
IE 20.190.159.4:443 tcp
US 8.252.116.126:80 tcp
GB 51.132.193.105:443 tcp
US 67.24.171.254:80 tcp
US 67.24.171.254:80 tcp
US 8.8.8.8:53 96.108.152.52.in-addr.arpa udp

Files

memory/2380-132-0x0000000000000000-mapping.dmp

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

MD5 feaa99287f22b1fad4acdfec4481daa3
SHA1 9e882b1037f36bb2ae131500954c16bc1f0aa26f
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA512 13ed01e3afef06b0596cd549ef814f6aece751f221b806828bde945bb9989979e1b1381875219cb23b8494f186f4120acfa64ddb1c577adf555f5260eb884366

memory/2836-133-0x0000000000000000-mapping.dmp

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

MD5 feaa99287f22b1fad4acdfec4481daa3
SHA1 9e882b1037f36bb2ae131500954c16bc1f0aa26f
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA512 13ed01e3afef06b0596cd549ef814f6aece751f221b806828bde945bb9989979e1b1381875219cb23b8494f186f4120acfa64ddb1c577adf555f5260eb884366

Analysis: behavioral1

Detonation Overview

Submitted

2022-07-25 14:42

Reported

2022-07-25 14:45

Platform

win7-20220715-en

Max time kernel

150s

Max time network

49s

Command Line

"C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1660 wrote to memory of 1656 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Windows\SysWOW64\cmd.exe
PID 1660 wrote to memory of 1656 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Windows\SysWOW64\cmd.exe
PID 1660 wrote to memory of 1656 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Windows\SysWOW64\cmd.exe
PID 1660 wrote to memory of 1656 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Windows\SysWOW64\cmd.exe
PID 1660 wrote to memory of 1932 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1660 wrote to memory of 1932 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1660 wrote to memory of 1932 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1660 wrote to memory of 1932 N/A C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Processes

C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.exe

"C:\Users\Admin\AppData\Local\Temp\55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c.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/1660-56-0x00000000762B1000-0x00000000762B3000-memory.dmp

memory/1656-57-0x0000000000000000-mapping.dmp

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

MD5 feaa99287f22b1fad4acdfec4481daa3
SHA1 9e882b1037f36bb2ae131500954c16bc1f0aa26f
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA512 13ed01e3afef06b0596cd549ef814f6aece751f221b806828bde945bb9989979e1b1381875219cb23b8494f186f4120acfa64ddb1c577adf555f5260eb884366

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

MD5 feaa99287f22b1fad4acdfec4481daa3
SHA1 9e882b1037f36bb2ae131500954c16bc1f0aa26f
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA512 13ed01e3afef06b0596cd549ef814f6aece751f221b806828bde945bb9989979e1b1381875219cb23b8494f186f4120acfa64ddb1c577adf555f5260eb884366

memory/1932-60-0x0000000000000000-mapping.dmp

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

MD5 feaa99287f22b1fad4acdfec4481daa3
SHA1 9e882b1037f36bb2ae131500954c16bc1f0aa26f
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA512 13ed01e3afef06b0596cd549ef814f6aece751f221b806828bde945bb9989979e1b1381875219cb23b8494f186f4120acfa64ddb1c577adf555f5260eb884366

memory/1932-65-0x0000000003381000-0x000000000422D000-memory.dmp

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

MD5 feaa99287f22b1fad4acdfec4481daa3
SHA1 9e882b1037f36bb2ae131500954c16bc1f0aa26f
SHA256 55dfd27d50e55d714888455ff76c5cbed787547df9e7f1bf7824d7e0994fdf6c
SHA512 13ed01e3afef06b0596cd549ef814f6aece751f221b806828bde945bb9989979e1b1381875219cb23b8494f186f4120acfa64ddb1c577adf555f5260eb884366