4f406878c498ad9b83996ea419e7a1c859df0be3b906bd6ed13ed14144824925

Analysis

max time kernel
150s
max time network
155s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
20/08/2026, 11:07

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General

Target
JKTool/taapi.dll
Size 4.4MB
Sample260820-m8f7psythw
SHA256 4f406878c498ad9b83996ea419e7a1c859df0be3b906bd6ed13ed14144824925
MD5 5fa80b32a3e8ea6f7a2a5d05c84ab3a6
SHA1 90612aabb5488f19ecf3c318d413dd230500fa8d
SHA512 16f63767c9a35644f082bf65edbc0346cd720a3a6a1720cb64431f84e9ad5398d631ba7907608f5a1cafe97942e105589211fe77b1993f2b58f32909868c2457
SSDEEP 49152:14mzdj3zTwvL+VGTNANXLy7DVdNid4IRsaZ5T7rp/yPWWYZfZKZq7vu:lMNANXo5dNe4CvZX/WYo
TLSH
T1B3268E02AFD151F4DA0E653211AE733ADF3B5E861319CBDB8794EC65A872140AD3A3CD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

6^/10

bootkit discovery persistence

Malware Config

Signatures

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	regsvr32.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	regsvr32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	regsvr32.exe

Modifies registry class 64 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Class\ = "Client Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Class\CLSID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Class\CLSID\ = "{8C9AEB85-F34C-48D4-A503-16E343963C98}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.VUser.1	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{DA5A3C04-D008-4039-AB3C-A42E8EC93FC1}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{DA5A3C04-D008-4039-AB3C-A42E8EC93FC1}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Job.1\CLSID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Job\CLSID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{472A5474-6735-45E8-8806-7A874CDB926D}\ProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}\ = "IJobCallBack"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Job	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F489FC44-4B4F-4CD3-A2DE-E2CFBB497C5A}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8C9AEB85-F34C-48D4-A503-16E343963C98}\InprocServer32\ThreadingModel = "both"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{472A5474-6735-45E8-8806-7A874CDB926D}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8C9AEB85-F34C-48D4-A503-16E343963C98}\ = "Client Class"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{472A5474-6735-45E8-8806-7A874CDB926D}\VersionIndependentProgID\ = "Taapi.VUser"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8C9AEB85-F34C-48D4-A503-16E343963C98}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.VUser.1\ = "VUser Class"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{472A5474-6735-45E8-8806-7A874CDB926D}\ProgID\ = "Taapi.VUser.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F489FC44-4B4F-4CD3-A2DE-E2CFBB497C5A}\InprocServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F489FC44-4B4F-4CD3-A2DE-E2CFBB497C5A}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\JKTool\\taapi.dll"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{95FBCF67-F673-4156-A508-2D5F26F395F7}\1.0\FLAGS	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{ECAF2417-62E7-487D-BFB3-E69DF565F450}\TypeLib\ = "{95FBCF67-F673-4156-A508-2D5F26F395F7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{ECAF2417-62E7-487D-BFB3-E69DF565F450}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F827B8A9-A050-457C-996E-DD1224C26A7A}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CDC7A9C7-5873-4903-BD4F-D6F6DDB14936}\ = "Engine Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Job.1	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F827B8A9-A050-457C-996E-DD1224C26A7A}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}\TypeLib\ = "{95FBCF67-F673-4156-A508-2D5F26F395F7}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Engine	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Engine\ = "Engine Class"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CDC7A9C7-5873-4903-BD4F-D6F6DDB14936}\InprocServer32\ThreadingModel = "both"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.VUser\ = "VUser Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{95FBCF67-F673-4156-A508-2D5F26F395F7}\1.0\0\win32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{ECAF2417-62E7-487D-BFB3-E69DF565F450}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CDC7A9C7-5873-4903-BD4F-D6F6DDB14936}\InprocServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Job.1\CLSID\ = "{F489FC44-4B4F-4CD3-A2DE-E2CFBB497C5A}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F489FC44-4B4F-4CD3-A2DE-E2CFBB497C5A}\InprocServer32\ThreadingModel = "both"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{ECAF2417-62E7-487D-BFB3-E69DF565F450}\ = "IJob"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F827B8A9-A050-457C-996E-DD1224C26A7A}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{F827B8A9-A050-457C-996E-DD1224C26A7A}\TypeLib\ = "{95FBCF67-F673-4156-A508-2D5F26F395F7}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{DA5A3C04-D008-4039-AB3C-A42E8EC93FC1}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Engine.1\CLSID\ = "{CDC7A9C7-5873-4903-BD4F-D6F6DDB14936}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CDC7A9C7-5873-4903-BD4F-D6F6DDB14936}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\JKTool\\taapi.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Taapi.Job.1\ = "Job Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Class.1\CLSID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{95FBCF67-F673-4156-A508-2D5F26F395F7}\1.0\HELPDIR	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{DA5A3C04-D008-4039-AB3C-A42E8EC93FC1}\ = "IEngine"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{F2430850-3737-401A-BA26-459B6C99EE71}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{ECAF2417-62E7-487D-BFB3-E69DF565F450}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{ECAF2417-62E7-487D-BFB3-E69DF565F450}\TypeLib\ = "{95FBCF67-F673-4156-A508-2D5F26F395F7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{F827B8A9-A050-457C-996E-DD1224C26A7A}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{DA5A3C04-D008-4039-AB3C-A42E8EC93FC1}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{D76EACA2-FD3F-4E92-BE56-47A795A36DF9}\TypeLib\Version = "1.0"	regsvr32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 5404 wrote to memory of 4224	5404	regsvr32.exe	89

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\JKTool\taapi.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:5404
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\JKTool\taapi.dll
  2⤵
  - Writes to the Master Boot Record (MBR)
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Modifies registry class
  PID:4224