kutaki | 29b194f5409b24a2bdf4b74f35e13a73e7e133dab36339f7b2cc9a0e4f007e17

Resubmissions

17/09/2022, 21:15

220917-z36avsace4 10

12/09/2022, 07:51

220912-jptrxacge8 10

Analysis

max time kernel
105s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
12/09/2022, 07:51

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General

Target

Payment Confirmation Invoice.exe
Size

408KB
MD5

226bea0278f6534c83992d1ceac1c211
SHA1

b1a3df7bedbb45b0a2df9e575293d795996da01a
SHA256

29b194f5409b24a2bdf4b74f35e13a73e7e133dab36339f7b2cc9a0e4f007e17
SHA512

e889315f6609ace41811e0f7379cccb802b0ed3012337f9653241b3a0bdaf9b9bf523b9134b2e373d9117118fef68565c1a5e7eb57ddb53c2656277f2957277e
SSDEEP

6144:ax9Xwhm7c/n10V7cMW4Es+CS/wUcvzUjSa5pK2mKdl0TruunfD09gfJChgGJhCj:abXwhm7a1gB4/8vYjDpK8atfx8hDu

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 4 IoCs

resource	yara_rule
behavioral1/files/0x000a0000000122e5-58.dat	family_kutaki
behavioral1/files/0x000a0000000122e5-59.dat	family_kutaki
behavioral1/files/0x000a0000000122e5-61.dat	family_kutaki
behavioral1/files/0x000a0000000122e5-68.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
1804	ch.exe

Drops startup file 2 IoCs

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

Loads dropped DLL 2 IoCs

pid	Process
780	Payment Confirmation Invoice.exe
780	Payment Confirmation Invoice.exe

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

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Internet Explorer\Main	ch.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1384	DllHost.exe

Suspicious use of SetWindowsHookEx 64 IoCs

pid	Process
780	Payment Confirmation Invoice.exe
780	Payment Confirmation Invoice.exe
780	Payment Confirmation Invoice.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe
1804	ch.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 780 wrote to memory of 2036	780	Payment Confirmation Invoice.exe	29
PID 780 wrote to memory of 2036	780	Payment Confirmation Invoice.exe	29
PID 780 wrote to memory of 2036	780	Payment Confirmation Invoice.exe	29
PID 780 wrote to memory of 2036	780	Payment Confirmation Invoice.exe	29
PID 780 wrote to memory of 1804	780	Payment Confirmation Invoice.exe	31
PID 780 wrote to memory of 1804	780	Payment Confirmation Invoice.exe	31
PID 780 wrote to memory of 1804	780	Payment Confirmation Invoice.exe	31
PID 780 wrote to memory of 1804	780	Payment Confirmation Invoice.exe	31

C:\Users\Admin\AppData\Local\Temp\Payment Confirmation Invoice.exe
"C:\Users\Admin\AppData\Local\Temp\Payment Confirmation Invoice.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:780
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  PID:2036
- 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
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:1804

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
1⤵
- Suspicious use of FindShellTrayWindow
PID:1384

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

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
408KB

MD5
226bea0278f6534c83992d1ceac1c211

SHA1
b1a3df7bedbb45b0a2df9e575293d795996da01a

SHA256
29b194f5409b24a2bdf4b74f35e13a73e7e133dab36339f7b2cc9a0e4f007e17

SHA512
e889315f6609ace41811e0f7379cccb802b0ed3012337f9653241b3a0bdaf9b9bf523b9134b2e373d9117118fef68565c1a5e7eb57ddb53c2656277f2957277e

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

Filesize
408KB

MD5
226bea0278f6534c83992d1ceac1c211

SHA1
b1a3df7bedbb45b0a2df9e575293d795996da01a

SHA256
29b194f5409b24a2bdf4b74f35e13a73e7e133dab36339f7b2cc9a0e4f007e17

SHA512
e889315f6609ace41811e0f7379cccb802b0ed3012337f9653241b3a0bdaf9b9bf523b9134b2e373d9117118fef68565c1a5e7eb57ddb53c2656277f2957277e

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

Filesize
408KB

MD5
226bea0278f6534c83992d1ceac1c211

SHA1
b1a3df7bedbb45b0a2df9e575293d795996da01a

SHA256
29b194f5409b24a2bdf4b74f35e13a73e7e133dab36339f7b2cc9a0e4f007e17

SHA512
e889315f6609ace41811e0f7379cccb802b0ed3012337f9653241b3a0bdaf9b9bf523b9134b2e373d9117118fef68565c1a5e7eb57ddb53c2656277f2957277e

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

Filesize
408KB

MD5
226bea0278f6534c83992d1ceac1c211

SHA1
b1a3df7bedbb45b0a2df9e575293d795996da01a

SHA256
29b194f5409b24a2bdf4b74f35e13a73e7e133dab36339f7b2cc9a0e4f007e17

SHA512
e889315f6609ace41811e0f7379cccb802b0ed3012337f9653241b3a0bdaf9b9bf523b9134b2e373d9117118fef68565c1a5e7eb57ddb53c2656277f2957277e

Download Submit
memory/780-56-0x0000000076321000-0x0000000076323000-memory.dmp

Filesize
8KB

Download
memory/1804-67-0x00000000034C1000-0x000000000436D000-memory.dmp

Filesize
14.7MB

Download