kutaki | fbc0263ae8cef48b184cfee870c2f5f4ee3c5006ffb0090cc3f024486628a4eb

Analysis

max time kernel
124s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
29/07/2022, 20:55

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General

Target

Tax Payment Invoice.exe
Size

740KB
MD5

bba7a2ee3cc8f1b19f25cf46a2c35b24
SHA1

f62736f38dc27ed47bd89c75eff750ef1d2fb8e4
SHA256

fbc0263ae8cef48b184cfee870c2f5f4ee3c5006ffb0090cc3f024486628a4eb
SHA512

0bbcc177b77f01d3e65faff0c0913562270b580cc86a3b944fb53750484e0231160f4947492ac34257df3cfbdab4ea080cc7826aa7ff5dac4d5fecc8bbaa512d

Score

10^/10

kutaki keylogger stealer

Malware Config

Extracted

Family

kutaki

http://newloshree.xyz/work/kenny3.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/0x0007000000022eb9-134.dat	family_kutaki
behavioral2/files/0x0007000000022eb9-135.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
1976	ch.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-1-5-21-2372564722-193526734-2636556182-1000\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\ch.exe	Tax Payment Invoice.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe	Tax Payment Invoice.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-1-5-21-2372564722-193526734-2636556182-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
520	mspaint.exe
520	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
4788	Tax Payment Invoice.exe
4788	Tax Payment Invoice.exe
4788	Tax Payment Invoice.exe
1976	ch.exe
520	mspaint.exe
520	mspaint.exe
520	mspaint.exe
520	mspaint.exe
1976	ch.exe
1976	ch.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 2896	4788	Tax Payment Invoice.exe	84
PID 4788 wrote to memory of 2896	4788	Tax Payment Invoice.exe	84
PID 4788 wrote to memory of 2896	4788	Tax Payment Invoice.exe	84
PID 4788 wrote to memory of 1976	4788	Tax Payment Invoice.exe	86
PID 4788 wrote to memory of 1976	4788	Tax Payment Invoice.exe	86
PID 4788 wrote to memory of 1976	4788	Tax Payment Invoice.exe	86
PID 2896 wrote to memory of 520	2896	cmd.exe	87
PID 2896 wrote to memory of 520	2896	cmd.exe	87
PID 2896 wrote to memory of 520	2896	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\Tax Payment Invoice.exe
"C:\Users\Admin\AppData\Local\Temp\Tax Payment Invoice.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4788
- 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:2896
- - 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:520
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1976

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:1148

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

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

Filesize
740KB

MD5
bba7a2ee3cc8f1b19f25cf46a2c35b24

SHA1
f62736f38dc27ed47bd89c75eff750ef1d2fb8e4

SHA256
fbc0263ae8cef48b184cfee870c2f5f4ee3c5006ffb0090cc3f024486628a4eb

SHA512
0bbcc177b77f01d3e65faff0c0913562270b580cc86a3b944fb53750484e0231160f4947492ac34257df3cfbdab4ea080cc7826aa7ff5dac4d5fecc8bbaa512d

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

Filesize
740KB

MD5
bba7a2ee3cc8f1b19f25cf46a2c35b24

SHA1
f62736f38dc27ed47bd89c75eff750ef1d2fb8e4

SHA256
fbc0263ae8cef48b184cfee870c2f5f4ee3c5006ffb0090cc3f024486628a4eb

SHA512
0bbcc177b77f01d3e65faff0c0913562270b580cc86a3b944fb53750484e0231160f4947492ac34257df3cfbdab4ea080cc7826aa7ff5dac4d5fecc8bbaa512d

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