Malware Analysis Report

2024-11-13 14:55

Sample ID 220726-xbazjagag4
Target bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
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

bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4

Threat Level: Known bad

The file bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4 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

2022-07-26 18:40

Signatures

Kutaki Executable

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

Kutaki family

kutaki

Analysis: behavioral1

Detonation Overview

Submitted

2022-07-26 18:40

Reported

2022-07-26 18:44

Platform

win7-20220718-en

Max time kernel

150s

Max time network

46s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.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\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.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\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe N/A

Maps connected drives based on registry

Description Indicator Process Target
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
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum 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-1-5-21-4084403625-2215941253-1760665084-1000\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 1676 wrote to memory of 1356 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Windows\SysWOW64\cmd.exe
PID 1676 wrote to memory of 1356 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Windows\SysWOW64\cmd.exe
PID 1676 wrote to memory of 1356 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Windows\SysWOW64\cmd.exe
PID 1676 wrote to memory of 1356 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Windows\SysWOW64\cmd.exe
PID 1676 wrote to memory of 1552 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1676 wrote to memory of 1552 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1676 wrote to memory of 1552 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1676 wrote to memory of 1552 N/A C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Processes

C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe

"C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.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/1676-56-0x0000000076071000-0x0000000076073000-memory.dmp

memory/1356-57-0x0000000000000000-mapping.dmp

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

MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

memory/1552-60-0x0000000000000000-mapping.dmp

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

MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

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

MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

memory/1552-65-0x0000000003211000-0x00000000040BD000-memory.dmp

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

MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

Analysis: behavioral2

Detonation Overview

Submitted

2022-07-26 18:40

Reported

2022-07-26 18:45

Platform

win10v2004-20220721-en

Max time kernel

152s

Max time network

172s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.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\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.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\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe N/A

Maps connected drives based on registry

Description Indicator Process Target
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
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum 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\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.exe

"C:\Users\Admin\AppData\Local\Temp\bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4.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
NL 178.79.208.1:80 tcp
NL 13.69.109.131:443 tcp

Files

memory/3576-132-0x0000000000000000-mapping.dmp

memory/3220-133-0x0000000000000000-mapping.dmp

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

MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

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

MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6