Malware Analysis Report

2024-11-15 07:18

Sample ID 220708-y7dwqsffaj
Target a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
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

a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050

Threat Level: Known bad

The file a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050 was found to be: Known bad.

Malicious Activity Summary

kutaki keylogger stealer

Kutaki

Kutaki Executable

Kutaki family

Executes dropped EXE

Drops startup file

Loads dropped DLL

Maps connected drives based on registry

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Modifies Internet Explorer settings

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-07-08 20:25

Signatures

Kutaki Executable

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

Kutaki family

kutaki

Analysis: behavioral1

Detonation Overview

Submitted

2022-07-08 20:25

Reported

2022-07-08 23:20

Platform

win7-20220414-en

Max time kernel

150s

Max time network

48s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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-1-5-21-1819626980-2277161760-1023733287-1000\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 1932 wrote to memory of 964 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Windows\SysWOW64\cmd.exe
PID 1932 wrote to memory of 964 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Windows\SysWOW64\cmd.exe
PID 1932 wrote to memory of 964 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Windows\SysWOW64\cmd.exe
PID 1932 wrote to memory of 964 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Windows\SysWOW64\cmd.exe
PID 1932 wrote to memory of 1120 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1932 wrote to memory of 1120 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1932 wrote to memory of 1120 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
PID 1932 wrote to memory of 1120 N/A C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Processes

C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe

"C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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/1932-56-0x00000000762C1000-0x00000000762C3000-memory.dmp

memory/964-57-0x0000000000000000-mapping.dmp

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

MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a

memory/1120-60-0x0000000000000000-mapping.dmp

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

MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a

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

MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a

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

MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a

Analysis: behavioral2

Detonation Overview

Submitted

2022-07-08 20:25

Reported

2022-07-08 23:20

Platform

win10v2004-20220414-en

Max time kernel

150s

Max time network

103s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe

"C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.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
US 52.109.8.19:443 tcp
US 52.182.143.208:443 tcp

Files

memory/4720-132-0x0000000000000000-mapping.dmp

memory/4516-133-0x0000000000000000-mapping.dmp

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

MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a

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

MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a