kutaki | 4e95c654625af3c239740b6d8f1799d5ad938bcb9404d2935c5240c22985d76b

Analysis

max time kernel
150s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20231020-en
resource tags

arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
submitted
10-11-2023 14:40

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General

Target

Payment Channel.exe
Size

501KB
MD5

646849ab728ff631b3c70480638e6a2a
SHA1

8f9f70ef43add2a45e0a2430b2d9680616faef8b
SHA256

b8e4bcb3699104e49979cc86b84ce278bd6b9b392d65d465ac1acd7808ed0db0
SHA512

32f0a0949c33e0b34239581bbb86d3ee42acdaddc9856c78a55b88924dcade166663e2c8345040dbc2f383b74ebda88e952d9091643d8a7ea8e5d1fd82002de3
SSDEEP

12288:7Ycs+XKy/AZe+e9AP8LP810o4HfyNQlQj0DunOq0Mte9oIopkyd+wMeMIC10pqT1:7Ycs+XKy/AZeJ9AP8LP810o4HfyNQlQM

Score

10^/10

kutaki keylogger stealer

Malware Config

Extracted

Family

kutaki

http://linkwotowoto.club/new/two.php

Signatures

Kutaki
Information stealer and keylogger that hides inside legitimate Visual Basic applications.
stealer keylogger kutaki

Kutaki Executable 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe	family_kutaki
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe	family_kutaki

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

cmd.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000\Control Panel\International\Geo\Nation cmd.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000\Control Panel\International\Geo\Nation	cmd.exe

Drops startup file 2 IoCs

Processes:

Payment Channel.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe	Payment Channel.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe	Payment Channel.exe

Executes dropped EXE 1 IoCs

Processes:

rjrbgkfk.exe

pid process

3728 rjrbgkfk.exe
Drops file in Windows directory 1 IoCs

Processes:

mspaint.exe

description ioc process

File opened for modification C:\Windows\Debug\WIA\wiatrace.log mspaint.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

cmd.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000_Classes\Local Settings cmd.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

mspaint.exe

pid process

3972 mspaint.exe
3972 mspaint.exe

pid	process
3728	rjrbgkfk.exe

description	ioc	process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	mspaint.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000_Classes\Local Settings	cmd.exe

pid	process
3972	mspaint.exe
3972	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

Processes:

Payment Channel.exerjrbgkfk.exemspaint.exe

pid	process
1572	Payment Channel.exe
1572	Payment Channel.exe
1572	Payment Channel.exe
3728	rjrbgkfk.exe
3728	rjrbgkfk.exe
3728	rjrbgkfk.exe
3972	mspaint.exe
3972	mspaint.exe
3972	mspaint.exe
3972	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Payment Channel.execmd.exe

description	pid	process	target process
PID 1572 wrote to memory of 4500	1572	Payment Channel.exe	cmd.exe
PID 1572 wrote to memory of 4500	1572	Payment Channel.exe	cmd.exe
PID 1572 wrote to memory of 4500	1572	Payment Channel.exe	cmd.exe
PID 1572 wrote to memory of 3728	1572	Payment Channel.exe	rjrbgkfk.exe
PID 1572 wrote to memory of 3728	1572	Payment Channel.exe	rjrbgkfk.exe
PID 1572 wrote to memory of 3728	1572	Payment Channel.exe	rjrbgkfk.exe
PID 4500 wrote to memory of 3972	4500	cmd.exe	mspaint.exe
PID 4500 wrote to memory of 3972	4500	cmd.exe	mspaint.exe
PID 4500 wrote to memory of 3972	4500	cmd.exe	mspaint.exe

C:\Users\Admin\AppData\Local\Temp\Payment Channel.exe
"C:\Users\Admin\AppData\Local\Temp\Payment Channel.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1572

C:\Windows\SysWOW64\cmd.exe
cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
2⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4500

C:\Windows\SysWOW64\mspaint.exe
"C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp"
3⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:3972

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:3728

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:1744

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe
Filesize
501KB

MD5
646849ab728ff631b3c70480638e6a2a

SHA1
8f9f70ef43add2a45e0a2430b2d9680616faef8b

SHA256
b8e4bcb3699104e49979cc86b84ce278bd6b9b392d65d465ac1acd7808ed0db0

SHA512
32f0a0949c33e0b34239581bbb86d3ee42acdaddc9856c78a55b88924dcade166663e2c8345040dbc2f383b74ebda88e952d9091643d8a7ea8e5d1fd82002de3

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rjrbgkfk.exe
Filesize
501KB

MD5
646849ab728ff631b3c70480638e6a2a

SHA1
8f9f70ef43add2a45e0a2430b2d9680616faef8b

SHA256
b8e4bcb3699104e49979cc86b84ce278bd6b9b392d65d465ac1acd7808ed0db0

SHA512
32f0a0949c33e0b34239581bbb86d3ee42acdaddc9856c78a55b88924dcade166663e2c8345040dbc2f383b74ebda88e952d9091643d8a7ea8e5d1fd82002de3

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