kutaki | d0fd86e3254a14f3b99d141b8512eae447cd716436ba8a192422596a2b0bb625

General

Target

image.exe
Size

516KB
MD5

c43b7d74eef3fa1c025f08939e9d4be2
SHA1

0b41411bd1f52c115d77fc44815beed1b3cb749c
SHA256

d0fd86e3254a14f3b99d141b8512eae447cd716436ba8a192422596a2b0bb625
SHA512

9104a982f97370c03a95955b86bd9c37681d2c5aed2ba46ed0f113d915dbd83b1d237c6c5b128e24c7a3a3dc01c11fded5ef9eecf217255da98dd0eea5ee4d3d

Score

10^/10

kutaki keylogger stealer

Malware Config

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/0x000a00000001ab3e-123.dat	family_kutaki
behavioral2/files/0x000a00000001ab3e-124.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
416	rrnbsoch.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rrnbsoch.exe	image.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rrnbsoch.exe	image.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-1-5-21-369956170-74428499-1628131376-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4356	mspaint.exe
4356	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
3044	image.exe
3044	image.exe
3044	image.exe
4356	mspaint.exe
4356	mspaint.exe
4356	mspaint.exe
4356	mspaint.exe
416	rrnbsoch.exe
416	rrnbsoch.exe
416	rrnbsoch.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3044 wrote to memory of 4256	3044	image.exe	69
PID 3044 wrote to memory of 4256	3044	image.exe	69
PID 3044 wrote to memory of 4256	3044	image.exe	69
PID 4256 wrote to memory of 4356	4256	cmd.exe	71
PID 4256 wrote to memory of 4356	4256	cmd.exe	71
PID 4256 wrote to memory of 4356	4256	cmd.exe	71
PID 3044 wrote to memory of 416	3044	image.exe	75
PID 3044 wrote to memory of 416	3044	image.exe	75
PID 3044 wrote to memory of 416	3044	image.exe	75

C:\Users\Admin\AppData\Local\Temp\image.exe
"C:\Users\Admin\AppData\Local\Temp\image.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3044
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4256
- - 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:4356
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rrnbsoch.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\rrnbsoch.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:416

\??\c:\windows\system32\svchost.exe
c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
1⤵
PID:3848

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/416-125-0x00000000001D0000-0x00000000001D6000-memory.dmp

Filesize
24KB

Download
memory/416-126-0x00000000001D0000-0x00000000001DA000-memory.dmp

Filesize
40KB

Download
memory/3044-118-0x0000000000600000-0x0000000000606000-memory.dmp

Filesize
24KB

Download
memory/3044-119-0x0000000000600000-0x000000000060A000-memory.dmp

Filesize
40KB

Download

Analysis

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