Analysis
- max time kernel
149s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
10/09/2026, 09:27
Behavioral task
behavioral1
Sample
Tax_Notice_23665.exe
Resource
win10v2004-20260513-en
windows10-2004-x64
12 signatures
150 seconds
Behavioral task
behavioral2
Sample
Tax_Notice_23665.exe
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
12 signatures
150 seconds
Behavioral task
behavioral3
Sample
nvdahelperremote.dll
Resource
win10v2004-20260513-en
windows10-2004-x64
10 signatures
150 seconds
Behavioral task
behavioral4
Sample
nvdahelperremote.dll
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
10 signatures
150 seconds
General
- Target Tax_Notice_23665.exe
- Size 118KB
- Sample260910-leqcva1dmf
- SHA256 93dd8b7b393289f88493596faa4ae70054d9eb4fe47f2dd334f0c6bb5262f2a8
- MD5 1605971fa40b7f784311cecea47a251e
- SHA1 9fd5870678ae20ffe9cc8c26068e75935f27957d
- SHA512 39b5009020a2330d46a746ded44081c8ce0b08a608520ccdc3745f4b98020a537afd2872fed848c1d12321f3e90312297e436693db5017801726a14e115078de
- SSDEEP 3072:dfYomTuROFcA8eTRuznTVTX3xOcODofsdp9:dgouuTQTR4nl3yAsdj
- TLSH T126C36C5B63E530E9E1B78678C4914A59E776BC7107609FEF03A0425A2F272D18D3EF21
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Extracted
Family
-
packclient
C2
-
154.36.188.201:443
Signatures
- Family: DonutLoader
DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.
- Family: PackClient
PackClient is a Windows loader written in C.
- Detects DonutLoader 1 IoCs
resource yara_rule behavioral1/memory/3924-0-0x0000000000770000-0x00000000007D6000-memory.dmp family_donutloader - Adds Run key to start application 2 TTPs 4 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NvSvc = "C:\\ProgramData\\NVIDIA Corporation\\NvSvc\\Tax_Notice_23665.exe" Tax_Notice_23665.exe Set value (str) \REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\NvSvc = "C:\\ProgramData\\NVIDIA Corporation\\NvSvc\\Tax_Notice_23665.exe" Tax_Notice_23665.exe Set value (str) \REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NvSvc = "C:\\ProgramData\\NVIDIA Corporation\\NvSvc\\Tax_Notice_23665.exe" Tax_Notice_23665.exe Set value (str) \REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\NvSvc = "C:\\ProgramData\\NVIDIA Corporation\\NvSvc\\Tax_Notice_23665.exe" Tax_Notice_23665.exe - Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 3872 set thread context of 3924 3872 Tax_Notice_23665.exe 85 PID 3688 set thread context of 5008 3688 Tax_Notice_23665.exe 94 - Executes dropped EXE 1 IoCs
pid Process 3688 Tax_Notice_23665.exe - Loads dropped DLL 1 IoCs
pid Process 3688 Tax_Notice_23665.exe - System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language svchost.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language svchost.exe - Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3352 schtasks.exe 1760 schtasks.exe - Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 3872 Tax_Notice_23665.exe 3872 Tax_Notice_23665.exe 3688 Tax_Notice_23665.exe 3688 Tax_Notice_23665.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3924 3872 Tax_Notice_23665.exe 85 PID 3872 wrote to memory of 3352 3872 Tax_Notice_23665.exe 86 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 PID 3688 wrote to memory of 5008 3688 Tax_Notice_23665.exe 94 - Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Users\Admin\AppData\Local\Temp\Tax_Notice_23665.exe"C:\Users\Admin\AppData\Local\Temp\Tax_Notice_23665.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3872 -
C:\Windows\SysWOW64\svchost.exe"C:\Windows\SysWOW64\svchost.exe"2⤵
- System Location Discovery: System Language Discovery
PID:3924
-
-
C:\Windows\SYSTEM32\schtasks.exeschtasks /Create /TN NvSvc /TR "\"C:\ProgramData\NVIDIA Corporation\NvSvc\Tax_Notice_23665.exe\"" /SC ONLOGON /RL HIGHEST /F2⤵
- Scheduled Task/Job: Scheduled Task
PID:3352
-
-
C:\ProgramData\NVIDIA Corporation\NvSvc\Tax_Notice_23665.exe"C:\ProgramData\NVIDIA Corporation\NvSvc\Tax_Notice_23665.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3688 -
C:\Windows\SysWOW64\svchost.exe"C:\Windows\SysWOW64\svchost.exe"2⤵
- System Location Discovery: System Language Discovery
PID:5008
-
-
C:\Windows\system32\schtasks.exeschtasks /Create /TN NvSvc /TR "\"C:\ProgramData\NVIDIA Corporation\NvSvc\Tax_Notice_23665.exe\"" /SC ONLOGON /RL HIGHEST /F2⤵
- Scheduled Task/Job: Scheduled Task
PID:1760
-
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\ProgramData\NVIDIA Corporation\NvSvc\Tax_Notice_23665.exe
- Size 118KB
- SHA256 93dd8b7b393289f88493596faa4ae70054d9eb4fe47f2dd334f0c6bb5262f2a8
- MD5 1605971fa40b7f784311cecea47a251e
- SHA1 9fd5870678ae20ffe9cc8c26068e75935f27957d
- SHA512 39b5009020a2330d46a746ded44081c8ce0b08a608520ccdc3745f4b98020a537afd2872fed848c1d12321f3e90312297e436693db5017801726a14e115078de
- SSDEEP 3072:dfYomTuROFcA8eTRuznTVTX3xOcODofsdp9:dgouuTQTR4nl3yAsdj
- TLSH T126C36C5B63E530E9E1B78678C4914A59E776BC7107609FEF03A0425A2F272D18D3EF21
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\ProgramData\NVIDIA Corporation\NvSvc\nvdaHelperRemote.dll
- Size 444KB
- SHA256 7295090c2cb63ebc43f932451971c41f9d015d2741e97ae3d9855f5ae87cff94
- MD5 1f23d7cc6d6354c0e7b24eaa0652d96d
- SHA1 7ecde045e2d31a63312d7cd9c482e0d4aa74c7fc
- SHA512 6b9d778105e37d59f965ddd62f7c168534aad6c3055f5ae432fde12026cd9cb1464dba0abecf8fe6bc3d18fa5c37e0f5f871d39192802266e2cb7fde00a51131
- SSDEEP 6144:mrD9MHURHn18ScLDmy7OG1rQi5zeM4/hzcoAsYd9WAnnnOD9LJo:mNMAH1W3lF4/h4oAFd9W9LJo
- TLSH T137A4AE58EBD177F3E23220B872D8CA8A07C4DED7D1D491B3ADA62C1D4AD591208F2977
- MD5 SHA1 SHA512 SSDEEP TLSH