kutaki | 653e4db77fccf3be7fe499c286caa9c68cfa86a2db31beee92a6e14ba48f4a6d

Analysis

max time kernel
96s
max time network
48s
platform
windows7_x64
resource
win7-20220414-en
submitted
13-06-2022 10:26

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General

Target

Tax Payment Challan.exe
Size

3.7MB
MD5

5f25cb32cb11c4e4983d85bf95aee8f1
SHA1

cd7ec29d9a162ac4ffd453c2beafae52767a3739
SHA256

99229a496b7b21bc5385bf85b68358418a5e3554740fa8ed14d355c5bc25997d
SHA512

bd528327be04e93c074175cf415fdb75811d951eaf4fb752c1bc56cd843292ae8c10357a6b66745179d5007ad31867e83aeaa82b61f6165090e368a0c9332987

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 3 IoCs

resource	yara_rule
behavioral1/files/0x000a00000001231b-59.dat	family_kutaki
behavioral1/files/0x000a00000001231b-60.dat	family_kutaki
behavioral1/files/0x000a00000001231b-62.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
1708	ayfzsgch.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ayfzsgch.exe	Tax Payment Challan.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ayfzsgch.exe	Tax Payment Challan.exe

Loads dropped DLL 2 IoCs

pid	Process
1452	Tax Payment Challan.exe
1452	Tax Payment Challan.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1496	DllHost.exe

Suspicious use of SetWindowsHookEx 64 IoCs

pid	Process
1452	Tax Payment Challan.exe
1452	Tax Payment Challan.exe
1452	Tax Payment Challan.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
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1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
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1708	ayfzsgch.exe
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1708	ayfzsgch.exe
1708	ayfzsgch.exe
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1708	ayfzsgch.exe
1708	ayfzsgch.exe
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1708	ayfzsgch.exe
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1708	ayfzsgch.exe
1708	ayfzsgch.exe
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1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe
1708	ayfzsgch.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1452 wrote to memory of 744	1452	Tax Payment Challan.exe	29
PID 1452 wrote to memory of 744	1452	Tax Payment Challan.exe	29
PID 1452 wrote to memory of 744	1452	Tax Payment Challan.exe	29
PID 1452 wrote to memory of 744	1452	Tax Payment Challan.exe	29
PID 1452 wrote to memory of 1708	1452	Tax Payment Challan.exe	31
PID 1452 wrote to memory of 1708	1452	Tax Payment Challan.exe	31
PID 1452 wrote to memory of 1708	1452	Tax Payment Challan.exe	31
PID 1452 wrote to memory of 1708	1452	Tax Payment Challan.exe	31

C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe
"C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1452
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  PID:744
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ayfzsgch.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ayfzsgch.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1708

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
1⤵
- Suspicious use of FindShellTrayWindow
PID:1496

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
3.7MB

MD5
5f25cb32cb11c4e4983d85bf95aee8f1

SHA1
cd7ec29d9a162ac4ffd453c2beafae52767a3739

SHA256
99229a496b7b21bc5385bf85b68358418a5e3554740fa8ed14d355c5bc25997d

SHA512
bd528327be04e93c074175cf415fdb75811d951eaf4fb752c1bc56cd843292ae8c10357a6b66745179d5007ad31867e83aeaa82b61f6165090e368a0c9332987

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ayfzsgch.exe

Filesize
3.7MB

MD5
5f25cb32cb11c4e4983d85bf95aee8f1

SHA1
cd7ec29d9a162ac4ffd453c2beafae52767a3739

SHA256
99229a496b7b21bc5385bf85b68358418a5e3554740fa8ed14d355c5bc25997d

SHA512
bd528327be04e93c074175cf415fdb75811d951eaf4fb752c1bc56cd843292ae8c10357a6b66745179d5007ad31867e83aeaa82b61f6165090e368a0c9332987

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ayfzsgch.exe

Filesize
3.7MB

MD5
5f25cb32cb11c4e4983d85bf95aee8f1

SHA1
cd7ec29d9a162ac4ffd453c2beafae52767a3739

SHA256
99229a496b7b21bc5385bf85b68358418a5e3554740fa8ed14d355c5bc25997d

SHA512
bd528327be04e93c074175cf415fdb75811d951eaf4fb752c1bc56cd843292ae8c10357a6b66745179d5007ad31867e83aeaa82b61f6165090e368a0c9332987

Download Submit
memory/1452-56-0x0000000075EF1000-0x0000000075EF3000-memory.dmp

Filesize
8KB

Download