kutaki | 6df298c7b4e3a90153830ba400cf5dbcdf746a9eb5d1fba8a7071356799e2886

Analysis

max time kernel
150s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20231023-en
resource tags

arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
submitted
10-11-2023 02:36

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General

Target

Challan.exe
Size

501KB
MD5

816cdd0d2e0852404804a683d1cd1b53
SHA1

9842b46047c8ef18a2041a7a35fe3b51515dd829
SHA256

2114e284c9636a3b015aadb156369d5c55dc29541bc9f27ecf3724f16a65fa8d
SHA512

9648bb75a15afb57baeb7c9becf994dece54f499f04df344210c8241839d493599b71cf7ae7a9f4f790009ba3a9b8d2f80df7db41bac5b78edce20bd1a115cf2
SSDEEP

12288:6Ycs+XKy/AZe+e9AP8LP810o4HfyNQlQj0DunOq0Mte9oIopkyd+wMeMIC10pqTO:6Ycs+XKy/AZeJ9AP8LP810o4HfyNQlQn

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
behavioral2/files/0x0008000000022ca0-5.dat	family_kutaki
behavioral2/files/0x0008000000022ca0-6.dat	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-1-5-21-2231940048-779848787-2990559741-1000\Control Panel\International\Geo\Nation	cmd.exe

Drops startup file 2 IoCs

Processes:

Challan.exe

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vjxjjrfk.exe	Challan.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vjxjjrfk.exe	Challan.exe

Executes dropped EXE 1 IoCs

Processes:

vjxjjrfk.exe

pid	Process
3848	vjxjjrfk.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-1-5-21-2231940048-779848787-2990559741-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

mspaint.exe

pid	Process
1396	mspaint.exe
1396	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

Processes:

Challan.exevjxjjrfk.exemspaint.exe

pid	Process
4680	Challan.exe
4680	Challan.exe
4680	Challan.exe
3848	vjxjjrfk.exe
3848	vjxjjrfk.exe
3848	vjxjjrfk.exe
1396	mspaint.exe
1396	mspaint.exe
1396	mspaint.exe
1396	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Challan.execmd.exe

description	pid	Process	procid_target
PID 4680 wrote to memory of 3408	4680	Challan.exe	88
PID 4680 wrote to memory of 3408	4680	Challan.exe	88
PID 4680 wrote to memory of 3408	4680	Challan.exe	88
PID 4680 wrote to memory of 3848	4680	Challan.exe	90
PID 4680 wrote to memory of 3848	4680	Challan.exe	90
PID 4680 wrote to memory of 3848	4680	Challan.exe	90
PID 3408 wrote to memory of 1396	3408	cmd.exe	91
PID 3408 wrote to memory of 1396	3408	cmd.exe	91
PID 3408 wrote to memory of 1396	3408	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\Challan.exe
"C:\Users\Admin\AppData\Local\Temp\Challan.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4680
- 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:3408
- - 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:1396
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vjxjjrfk.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vjxjjrfk.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:3848

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:4964

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
501KB

MD5
816cdd0d2e0852404804a683d1cd1b53

SHA1
9842b46047c8ef18a2041a7a35fe3b51515dd829

SHA256
2114e284c9636a3b015aadb156369d5c55dc29541bc9f27ecf3724f16a65fa8d

SHA512
9648bb75a15afb57baeb7c9becf994dece54f499f04df344210c8241839d493599b71cf7ae7a9f4f790009ba3a9b8d2f80df7db41bac5b78edce20bd1a115cf2

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vjxjjrfk.exe

Filesize
501KB

MD5
816cdd0d2e0852404804a683d1cd1b53

SHA1
9842b46047c8ef18a2041a7a35fe3b51515dd829

SHA256
2114e284c9636a3b015aadb156369d5c55dc29541bc9f27ecf3724f16a65fa8d

SHA512
9648bb75a15afb57baeb7c9becf994dece54f499f04df344210c8241839d493599b71cf7ae7a9f4f790009ba3a9b8d2f80df7db41bac5b78edce20bd1a115cf2

Download Submit