kutaki | 2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca

General

Target
2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
Size 561KB
Sample240725-phlqls1epc
SHA256 2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca
MD5 ae3ecc20ed5eb6d09ac71eed21cadc7b
SHA1 8a5c57538ab356dcf99a320fc3724e618411a7b7
SHA512 a91b222f4890cc53f159390bc5ff725d525a6fb64e9a58842b35ecd0b17a2b989593cea9d16b83473c9fccb3af072296ef0a99499843ca372257ab8fc9e110f1
SSDEEP 12288:dUJ+IF3iIj6bn46A9jmP/uhu/yMS08CkntxYRCL:m+HIe8fmP/UDMS08Ckn3x
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

kutaki discovery keylogger stealer

Malware Config

Extracted

Family

kutaki

C2

http://newlinkwotolove.club/love/three.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/0x00070000000234cc-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-1-5-21-701583114-2636601053-947405450-1000\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\ulsrepfk.exe	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ulsrepfk.exe	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe

Executes dropped EXE 1 IoCs

pid	Process
984	ulsrepfk.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

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ulsrepfk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mspaint.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-701583114-2636601053-947405450-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1776	mspaint.exe
1776	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
984	ulsrepfk.exe
984	ulsrepfk.exe
984	ulsrepfk.exe
1776	mspaint.exe
1776	mspaint.exe
1776	mspaint.exe
1776	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4904 wrote to memory of 3480	4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe	87
PID 4904 wrote to memory of 3480	4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe	87
PID 4904 wrote to memory of 3480	4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe	87
PID 4904 wrote to memory of 984	4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe	89
PID 4904 wrote to memory of 984	4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe	89
PID 4904 wrote to memory of 984	4904	2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe	89
PID 3480 wrote to memory of 1776	3480	cmd.exe	91
PID 3480 wrote to memory of 1776	3480	cmd.exe	91
PID 3480 wrote to memory of 1776	3480	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe
"C:\Users\Admin\AppData\Local\Temp\2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca.exe"
1⤵
- Drops startup file
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4904
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:3480
- - C:\Windows\SysWOW64\mspaint.exe
    "C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp"
    3⤵
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:1776
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ulsrepfk.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ulsrepfk.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:984

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:4860

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

ulsrepfk.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ulsrepfk.exe
Size 561KB
SHA256 2c87a4f8cd94516457dcb4f4563a558120b9b3f9f4aaef5d12eb383ef6b7d4ca
MD5 ae3ecc20ed5eb6d09ac71eed21cadc7b
SHA1 8a5c57538ab356dcf99a320fc3724e618411a7b7
SHA512 a91b222f4890cc53f159390bc5ff725d525a6fb64e9a58842b35ecd0b17a2b989593cea9d16b83473c9fccb3af072296ef0a99499843ca372257ab8fc9e110f1
SSDEEP 12288:dUJ+IF3iIj6bn46A9jmP/uhu/yMS08CkntxYRCL:m+HIe8fmP/UDMS08Ckn3x
MD5 SHA1 SHA512 SSDEEP

Submit Download

Analysis

Sharing