kutaki | 91b554f66c4b9cf1d09d6ec7b5ad10b735fa0aa0bcc7bc91fc96b82c2e481b41

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
05-06-2023 10:30

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General

Target

Tax Payment Challan.exe
Size

650KB
MD5

f236ef2812755f787b852acd19655592
SHA1

5a3678b093a0dddf8bdd47be635a7c4bba97725b
SHA256

6cc89c4ee5308a2c40874f02f8f636bf77133c0b1bc59df8e806fda5e509424a
SHA512

61e5f17cc2463b1c57385c4925a82b6fb5c7ea4898e29d45c20d3953ec7059dba466038881b70a2a0f29dee936107aced84939d695718d129a8b87dffa802174
SSDEEP

12288:16UaeOpx41/ai46A9jmP/uhu/yMS08CkntxYRAAL:ALezaNfmP/UDMS08Ckn3K

Score

10^/10

kutaki keylogger stealer

Malware Config

Extracted

Family

kutaki

http://linkwotowoto.club/new/two.php

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/0x0003000000000731-139.dat	family_kutaki
behavioral2/files/0x0003000000000731-138.dat	family_kutaki

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	cmd.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
4112	pfubuwfk.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).

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
116	mspaint.exe
116	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
2640	Tax Payment Challan.exe
2640	Tax Payment Challan.exe
2640	Tax Payment Challan.exe
4112	pfubuwfk.exe
4112	pfubuwfk.exe
4112	pfubuwfk.exe
116	mspaint.exe
116	mspaint.exe
116	mspaint.exe
116	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2640 wrote to memory of 4116	2640	Tax Payment Challan.exe	87
PID 2640 wrote to memory of 4116	2640	Tax Payment Challan.exe	87
PID 2640 wrote to memory of 4116	2640	Tax Payment Challan.exe	87
PID 2640 wrote to memory of 4112	2640	Tax Payment Challan.exe	89
PID 2640 wrote to memory of 4112	2640	Tax Payment Challan.exe	89
PID 2640 wrote to memory of 4112	2640	Tax Payment Challan.exe	89
PID 4116 wrote to memory of 116	4116	cmd.exe	90
PID 4116 wrote to memory of 116	4116	cmd.exe	90
PID 4116 wrote to memory of 116	4116	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe
"C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2640
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  - Checks computer location settings
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4116
- - 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:116
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\pfubuwfk.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\pfubuwfk.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:4112

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:5028

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

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\pfubuwfk.exe

Filesize
650KB

MD5
f236ef2812755f787b852acd19655592

SHA1
5a3678b093a0dddf8bdd47be635a7c4bba97725b

SHA256
6cc89c4ee5308a2c40874f02f8f636bf77133c0b1bc59df8e806fda5e509424a

SHA512
61e5f17cc2463b1c57385c4925a82b6fb5c7ea4898e29d45c20d3953ec7059dba466038881b70a2a0f29dee936107aced84939d695718d129a8b87dffa802174

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

Filesize
650KB

MD5
f236ef2812755f787b852acd19655592

SHA1
5a3678b093a0dddf8bdd47be635a7c4bba97725b

SHA256
6cc89c4ee5308a2c40874f02f8f636bf77133c0b1bc59df8e806fda5e509424a

SHA512
61e5f17cc2463b1c57385c4925a82b6fb5c7ea4898e29d45c20d3953ec7059dba466038881b70a2a0f29dee936107aced84939d695718d129a8b87dffa802174

Download Submit