kutaki | 026fd16b5f3c3d9d23e9a9dbd29af68d89e6ed4d8cadc250e00d798fd489d74a

Analysis

max time kernel
151s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
22-03-2024 15:47

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General

Target

Tax Payment Confirmation.exe
Size

805KB
MD5

ff22cbacd681684e683e3cc90b5eeb49
SHA1

ff242e78602ea1c38bf81830932858188a682040
SHA256

026fd16b5f3c3d9d23e9a9dbd29af68d89e6ed4d8cadc250e00d798fd489d74a
SHA512

d012ee702f1566fd99658bc231ddb5152001c11f665351c6a269293f00a5d9d67ade90e3d342f30a4b709067c59e7d01c4eecf5d418f0ea638d1857f5f0c3b25
SSDEEP

12288:cwU/v0YM3/BJzGG6bBiNH46A9jmP/uhu/yMS08CkntxYRjL:BK2BN6BiNYfmP/UDMS08Ckn3W

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
behavioral2/files/0x0007000000023277-5.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-1-5-21-3808065738-1666277613-1125846146-1000\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\rvsinufk.exe	Tax Payment Confirmation.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rvsinufk.exe	Tax Payment Confirmation.exe

Executes dropped EXE 1 IoCs

pid	Process
1060	rvsinufk.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-1-5-21-3808065738-1666277613-1125846146-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1800	mspaint.exe
1800	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
3212	Tax Payment Confirmation.exe
3212	Tax Payment Confirmation.exe
3212	Tax Payment Confirmation.exe
1060	rvsinufk.exe
1060	rvsinufk.exe
1060	rvsinufk.exe
1800	mspaint.exe
1800	mspaint.exe
1800	mspaint.exe
1800	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3212 wrote to memory of 1104	3212	Tax Payment Confirmation.exe	102
PID 3212 wrote to memory of 1104	3212	Tax Payment Confirmation.exe	102
PID 3212 wrote to memory of 1104	3212	Tax Payment Confirmation.exe	102
PID 3212 wrote to memory of 1060	3212	Tax Payment Confirmation.exe	104
PID 3212 wrote to memory of 1060	3212	Tax Payment Confirmation.exe	104
PID 3212 wrote to memory of 1060	3212	Tax Payment Confirmation.exe	104
PID 1104 wrote to memory of 1800	1104	cmd.exe	106
PID 1104 wrote to memory of 1800	1104	cmd.exe	106
PID 1104 wrote to memory of 1800	1104	cmd.exe	106

C:\Users\Admin\AppData\Local\Temp\Tax Payment Confirmation.exe
"C:\Users\Admin\AppData\Local\Temp\Tax Payment Confirmation.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3212
- 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:1104
- - 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:1800
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rvsinufk.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rvsinufk.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1060

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:3912

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3676 --field-trial-handle=2248,i,10247514684337323751,15511974759131734137,262144 --variations-seed-version /prefetch:8
1⤵
PID:2012

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\rvsinufk.exe

Filesize
805KB

MD5
ff22cbacd681684e683e3cc90b5eeb49

SHA1
ff242e78602ea1c38bf81830932858188a682040

SHA256
026fd16b5f3c3d9d23e9a9dbd29af68d89e6ed4d8cadc250e00d798fd489d74a

SHA512
d012ee702f1566fd99658bc231ddb5152001c11f665351c6a269293f00a5d9d67ade90e3d342f30a4b709067c59e7d01c4eecf5d418f0ea638d1857f5f0c3b25

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