kutaki | 620fafa603b8414c4bb1616f52c37335f2903df7af4da487926a6c6965ee2f78

Analysis

max time kernel
150s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
19/02/2024, 06:29

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General

Target
file.exe
Size 597KB
Sample240219-g9cb9aba28
SHA256 620fafa603b8414c4bb1616f52c37335f2903df7af4da487926a6c6965ee2f78
MD5 ec665f89e74d25d37731652989ad3c2e
SHA1 82818a05e393db30f6c72c13cf8086b1dd6f67c7
SHA512 c774ded25b26229a97e42575b6b13415807c43b76b7eb36081a507ca407090885821e336d4f23ae61cdd627f3daad2a433c6d55eeab7039623c5c152a8a099f8
SSDEEP 12288:qK1aFT8EUJHvXH/Xgv46A9jmP/uhu/yMS08CkntxYRWaL:qBYLJvXH/wgfmP/UDMS08Ckn3E
MD5 SHA1 SHA512 SSDEEP

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 1 IoCs

resource	yara_rule
behavioral3/files/0x0007000000023149-5.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation	cmd.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
1560	bznvdffk.exe

Drops file in Windows directory 1 IoCs

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

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3676	mspaint.exe
3676	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
4732	file.exe
4732	file.exe
4732	file.exe
1560	bznvdffk.exe
1560	bznvdffk.exe
1560	bznvdffk.exe
3676	mspaint.exe
3676	mspaint.exe
3676	mspaint.exe
3676	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4732 wrote to memory of 1360	4732	file.exe	83
PID 4732 wrote to memory of 1360	4732	file.exe	83
PID 4732 wrote to memory of 1360	4732	file.exe	83
PID 4732 wrote to memory of 1560	4732	file.exe	85
PID 4732 wrote to memory of 1560	4732	file.exe	85
PID 4732 wrote to memory of 1560	4732	file.exe	85
PID 1360 wrote to memory of 3676	1360	cmd.exe	86
PID 1360 wrote to memory of 3676	1360	cmd.exe	86
PID 1360 wrote to memory of 3676	1360	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4732
- 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:1360
- - 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:3676
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bznvdffk.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bznvdffk.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1560

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:1552

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

bznvdffk.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bznvdffk.exe
Size 597KB
SHA256 620fafa603b8414c4bb1616f52c37335f2903df7af4da487926a6c6965ee2f78
MD5 ec665f89e74d25d37731652989ad3c2e
SHA1 82818a05e393db30f6c72c13cf8086b1dd6f67c7
SHA512 c774ded25b26229a97e42575b6b13415807c43b76b7eb36081a507ca407090885821e336d4f23ae61cdd627f3daad2a433c6d55eeab7039623c5c152a8a099f8
SSDEEP 12288:qK1aFT8EUJHvXH/Xgv46A9jmP/uhu/yMS08CkntxYRWaL:qBYLJvXH/wgfmP/UDMS08Ckn3E
MD5 SHA1 SHA512 SSDEEP

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