kutaki | b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf

Analysis

max time kernel
78s
max time network
46s
platform
windows7_x64
resource
win7-20220718-en
resource tags

arch:x64arch:x86image:win7-20220718-enlocale:en-usos:windows7-x64system
submitted
24/07/2022, 20:24

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General

Target

b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
Size

636KB
MD5

d31babbee891b978c01df4bc1598b453
SHA1

973ec9c69c496bc7984388f7541e8f5f34d1721d
SHA256

b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf
SHA512

028ba6e00e41594e6d77ec6ecc216378cf59b5a33a936b9237b7f4ac8ab8fd265bf5f3914e61ad1bcb9927b204c51b706140d451fb4910992b3d4694331980b3

Score

10^/10

kutaki keylogger stealer

Malware Config

Extracted

Family

kutaki

http://maregatu.club/paapoo/pove.php

http://terebinnahi.club/sec/kool.txt

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/0x0008000000014675-58.dat	family_kutaki
behavioral1/files/0x0008000000014675-59.dat	family_kutaki
behavioral1/files/0x0008000000014675-61.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
1328	bkkmpxch.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkkmpxch.exe	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkkmpxch.exe	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe

Loads dropped DLL 2 IoCs

pid	Process
892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	bkkmpxch.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	bkkmpxch.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 SetWindowsHookEx 64 IoCs

pid	Process
892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe
1328	bkkmpxch.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 892 wrote to memory of 944	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	28
PID 892 wrote to memory of 944	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	28
PID 892 wrote to memory of 944	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	28
PID 892 wrote to memory of 944	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	28
PID 892 wrote to memory of 1328	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	30
PID 892 wrote to memory of 1328	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	30
PID 892 wrote to memory of 1328	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	30
PID 892 wrote to memory of 1328	892	b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe	30

C:\Users\Admin\AppData\Local\Temp\b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe
"C:\Users\Admin\AppData\Local\Temp\b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:892
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\
  2⤵
  PID:944
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkkmpxch.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkkmpxch.exe"
  2⤵
  - Executes dropped EXE
  - Maps connected drives based on registry
  - Suspicious use of SetWindowsHookEx
  PID:1328

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

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\bkkmpxch.exe

Filesize
636KB

MD5
d31babbee891b978c01df4bc1598b453

SHA1
973ec9c69c496bc7984388f7541e8f5f34d1721d

SHA256
b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf

SHA512
028ba6e00e41594e6d77ec6ecc216378cf59b5a33a936b9237b7f4ac8ab8fd265bf5f3914e61ad1bcb9927b204c51b706140d451fb4910992b3d4694331980b3

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

Filesize
636KB

MD5
d31babbee891b978c01df4bc1598b453

SHA1
973ec9c69c496bc7984388f7541e8f5f34d1721d

SHA256
b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf

SHA512
028ba6e00e41594e6d77ec6ecc216378cf59b5a33a936b9237b7f4ac8ab8fd265bf5f3914e61ad1bcb9927b204c51b706140d451fb4910992b3d4694331980b3

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

Filesize
636KB

MD5
d31babbee891b978c01df4bc1598b453

SHA1
973ec9c69c496bc7984388f7541e8f5f34d1721d

SHA256
b5b970b6d52e53a875ffc8e03065bd6dc200431b9f8f88b6632a73193407e0bf

SHA512
028ba6e00e41594e6d77ec6ecc216378cf59b5a33a936b9237b7f4ac8ab8fd265bf5f3914e61ad1bcb9927b204c51b706140d451fb4910992b3d4694331980b3

Download Submit
memory/892-56-0x0000000075831000-0x0000000075833000-memory.dmp

Filesize
8KB

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