kutaki | 9b3c2853944f7dc6985774f53efcdf30b357f3dce5abd8d6b0f924b033d25911

Analysis

max time kernel
149s
max time network
127s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
05/01/2023, 09:49

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General

Target
3.exe
Size 541KB
Sample230105-lthasafa8s
SHA256 9b3c2853944f7dc6985774f53efcdf30b357f3dce5abd8d6b0f924b033d25911
MD5 86f76a5b4137c86d3eed43cfac187f7e
SHA1 a7a8e3c6cd76b6c4a05f6747c75cdd4587c09725
SHA512 9d36390d5b016ed9a27678dc170c6ab95fe5fa0a4b91ac9abd89b99593fa7259efd6f6a5f86943c1b0bb00357e2404688d3cd6df4490cfe592d2b2401c4c25f3
SSDEEP 12288:+2D18PzBRRHsj1SFKihy46A9jmP/uhu/yMS08CkntxYRRL:ypMj1SHfmP/UDMS08Ckn3I
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

kutaki keylogger stealer

Malware Config

Extracted

Family

kutaki

http://newbosslink.xyz/baba/new4.php

Signatures

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

Kutaki Executable 2 IoCs

resource	yara_rule
behavioral2/files/0x000b00000001db67-138.dat	family_kutaki
behavioral2/files/0x000b00000001db67-137.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
5100	dvisrifk.exe

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-1-5-21-929662420-1054238289-2961194603-1000\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\dvisrifk.exe	3.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvisrifk.exe	3.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). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2700	mspaint.exe
2700	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
4872	3.exe
4872	3.exe
4872	3.exe
2700	mspaint.exe
5100	dvisrifk.exe
2700	mspaint.exe
2700	mspaint.exe
2700	mspaint.exe
5100	dvisrifk.exe
5100	dvisrifk.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4872 wrote to memory of 2152	4872	3.exe	80
PID 4872 wrote to memory of 2152	4872	3.exe	80
PID 4872 wrote to memory of 2152	4872	3.exe	80
PID 2152 wrote to memory of 2700	2152	cmd.exe	82
PID 2152 wrote to memory of 2700	2152	cmd.exe	82
PID 2152 wrote to memory of 2700	2152	cmd.exe	82
PID 4872 wrote to memory of 5100	4872	3.exe	85
PID 4872 wrote to memory of 5100	4872	3.exe	85
PID 4872 wrote to memory of 5100	4872	3.exe	85

C:\Users\Admin\AppData\Local\Temp\3.exe
"C:\Users\Admin\AppData\Local\Temp\3.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4872
- 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:2152
- - 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:2700
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvisrifk.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvisrifk.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:5100

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:680

Network

MITRE ATT&CK Enterprise v6

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

dvisrifk.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvisrifk.exe
Size 541KB
SHA256 9b3c2853944f7dc6985774f53efcdf30b357f3dce5abd8d6b0f924b033d25911
MD5 86f76a5b4137c86d3eed43cfac187f7e
SHA1 a7a8e3c6cd76b6c4a05f6747c75cdd4587c09725
SHA512 9d36390d5b016ed9a27678dc170c6ab95fe5fa0a4b91ac9abd89b99593fa7259efd6f6a5f86943c1b0bb00357e2404688d3cd6df4490cfe592d2b2401c4c25f3
SSDEEP 12288:+2D18PzBRRHsj1SFKihy46A9jmP/uhu/yMS08CkntxYRRL:ypMj1SHfmP/UDMS08Ckn3I
MD5 SHA1 SHA512 SSDEEP

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dvisrifk.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dvisrifk.exe
Size 541KB
SHA256 9b3c2853944f7dc6985774f53efcdf30b357f3dce5abd8d6b0f924b033d25911
MD5 86f76a5b4137c86d3eed43cfac187f7e
SHA1 a7a8e3c6cd76b6c4a05f6747c75cdd4587c09725
SHA512 9d36390d5b016ed9a27678dc170c6ab95fe5fa0a4b91ac9abd89b99593fa7259efd6f6a5f86943c1b0bb00357e2404688d3cd6df4490cfe592d2b2401c4c25f3
SSDEEP 12288:+2D18PzBRRHsj1SFKihy46A9jmP/uhu/yMS08CkntxYRRL:ypMj1SHfmP/UDMS08Ckn3I
MD5 SHA1 SHA512 SSDEEP

Submit Download