kutaki | a4ce28e86378c0ea7453ffd0fe06e738e014133d598845ab8c62d76b7dd26ef8

Analysis

max time kernel
133s
max time network
46s
platform
windows7_x64
resource
win7-20220812-en
resource tags

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

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General

Target

HDFC Tax Payment Attached.exe
Size

408KB
MD5

f2d9b19707c3356037cb197852fe938d
SHA1

44e2604986ee12516c7a53226885eb062e70fb19
SHA256

793b8eebc54d69cd4e7e80400d55bc97dda0ff3836c39eec8c67a00285bdd722
SHA512

1a9de6ca3b77396792dc3914dcef44f00dec10ed2d51bcb7721c61756a290260523017de20a257a1e09969155208471967f5e2bd4ef34940b71d2f1e87709db0
SSDEEP

6144:Bx9Xwhm7c/n10V7c5W4Es+CS/wUcvzUjSa5pK2mKdl0TruunfD09gfJChgGJhCj:BbXwhm7a1NB4/8vYjDpK8atfx8hDu

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/0x000900000001311a-59.dat	family_kutaki
behavioral1/files/0x000900000001311a-58.dat	family_kutaki
behavioral1/files/0x000900000001311a-61.dat	family_kutaki
behavioral1/files/0x000900000001311a-68.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
1752	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	HDFC Tax Payment Attached.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe	HDFC Tax Payment Attached.exe

Loads dropped DLL 2 IoCs

pid	Process
1336	HDFC Tax Payment Attached.exe
1336	HDFC Tax Payment Attached.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
1320	DllHost.exe

Suspicious use of SetWindowsHookEx 64 IoCs

pid	Process
1336	HDFC Tax Payment Attached.exe
1336	HDFC Tax Payment Attached.exe
1336	HDFC Tax Payment Attached.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe
1752	ch.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1336 wrote to memory of 1748	1336	HDFC Tax Payment Attached.exe	28
PID 1336 wrote to memory of 1748	1336	HDFC Tax Payment Attached.exe	28
PID 1336 wrote to memory of 1748	1336	HDFC Tax Payment Attached.exe	28
PID 1336 wrote to memory of 1748	1336	HDFC Tax Payment Attached.exe	28
PID 1336 wrote to memory of 1752	1336	HDFC Tax Payment Attached.exe	30
PID 1336 wrote to memory of 1752	1336	HDFC Tax Payment Attached.exe	30
PID 1336 wrote to memory of 1752	1336	HDFC Tax Payment Attached.exe	30
PID 1336 wrote to memory of 1752	1336	HDFC Tax Payment Attached.exe	30

C:\Users\Admin\AppData\Local\Temp\HDFC Tax Payment Attached.exe
"C:\Users\Admin\AppData\Local\Temp\HDFC Tax Payment Attached.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1336
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  PID:1748
- 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:1752

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
1⤵
- Suspicious use of FindShellTrayWindow
PID:1320

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
f2d9b19707c3356037cb197852fe938d

SHA1
44e2604986ee12516c7a53226885eb062e70fb19

SHA256
793b8eebc54d69cd4e7e80400d55bc97dda0ff3836c39eec8c67a00285bdd722

SHA512
1a9de6ca3b77396792dc3914dcef44f00dec10ed2d51bcb7721c61756a290260523017de20a257a1e09969155208471967f5e2bd4ef34940b71d2f1e87709db0

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

Filesize
408KB

MD5
f2d9b19707c3356037cb197852fe938d

SHA1
44e2604986ee12516c7a53226885eb062e70fb19

SHA256
793b8eebc54d69cd4e7e80400d55bc97dda0ff3836c39eec8c67a00285bdd722

SHA512
1a9de6ca3b77396792dc3914dcef44f00dec10ed2d51bcb7721c61756a290260523017de20a257a1e09969155208471967f5e2bd4ef34940b71d2f1e87709db0

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

Filesize
408KB

MD5
f2d9b19707c3356037cb197852fe938d

SHA1
44e2604986ee12516c7a53226885eb062e70fb19

SHA256
793b8eebc54d69cd4e7e80400d55bc97dda0ff3836c39eec8c67a00285bdd722

SHA512
1a9de6ca3b77396792dc3914dcef44f00dec10ed2d51bcb7721c61756a290260523017de20a257a1e09969155208471967f5e2bd4ef34940b71d2f1e87709db0

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

Filesize
408KB

MD5
f2d9b19707c3356037cb197852fe938d

SHA1
44e2604986ee12516c7a53226885eb062e70fb19

SHA256
793b8eebc54d69cd4e7e80400d55bc97dda0ff3836c39eec8c67a00285bdd722

SHA512
1a9de6ca3b77396792dc3914dcef44f00dec10ed2d51bcb7721c61756a290260523017de20a257a1e09969155208471967f5e2bd4ef34940b71d2f1e87709db0

Download Submit
memory/1336-56-0x00000000762D1000-0x00000000762D3000-memory.dmp

Filesize
8KB

Download
memory/1752-67-0x0000000003351000-0x00000000041FD000-memory.dmp

Filesize
14.7MB

Download