donutloader | 7bfc8dd8459c957b7ba52c64ff4724fb0163878e8f9017ee0b8c1435b8e1706f

Analysis

max time kernel
899s
max time network
908s
platform
windows10-ltsc_2021_x64
resource
win10ltsc2021-20260513-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
submitted
30/07/2026, 23:38

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General

Target
MasonClient.exe
Size 84KB
Sample260730-3m7ershd44
SHA256 7bfc8dd8459c957b7ba52c64ff4724fb0163878e8f9017ee0b8c1435b8e1706f
MD5 129ab07785f9d94213fbce8eaf0a6ec5
SHA1 bb816deb11200da3705efc0a759f9f5be58b6043
SHA512 aad37ad71cb4ff0e955b74fc41fd4ee6fe25750ef5250a6476bf54a4a7dc2d6be2f85964078f8515c4e8a940c24e01b587d5123bc2ba1cb575df7e460435a3e5
SSDEEP 1536:Vm/4nHYMRBsMldzuuiFekVUN6KKfQGkid9aptJTdk2Rp0uRbAeuidmiri:VuCsqdzulgkVSVKmidmth+2lVpmiri
TLSH
T1C283E081CA3D8B6FF142E4F04315FF7B754AD5067BD7B25979D4223E8AB4A920312932
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

execution donutloader neptunerat loader persistence ransomware trojan

Malware Config

Extracted

Family

neptunerat

8.tcp.cpolar.top:14286

Attributes

filename
USB.exe
group
MasonGroup
key
dCoUkfS2ryZgCDPa
rat_name
MasonRAT

Signatures

Family: DonutLoader
DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.
loader donutloader
Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
trojan neptunerat

Detects DonutLoader 2 IoCs

loader

resource	yara_rule
behavioral2/memory/1472-1-0x0000000000B50000-0x0000000000B64000-memory.dmp	family_donutloader
behavioral2/memory/2164-12-0x000000001BCC0000-0x000000001BCD0000-memory.dmp	family_donutloader

Detects NeptuneRAT stealer 2 IoCs

resource	yara_rule
behavioral2/memory/1472-4-0x000000001AD10000-0x000000001AD22000-memory.dmp	family_neptunerat
behavioral2/memory/1472-5-0x000000001ADF0000-0x000000001AE00000-memory.dmp	family_neptunerat

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-1-5-21-2684263265-1628758615-802431902-1000\Control Panel\International\Geo\Nation	MasonClient.exe

Executes dropped EXE 16 IoCs

pid	Process
2164	MasonClient.exe
4976	MasonClient.exe
1212	MasonClient.exe
2908	MasonClient.exe
116	MasonClient.exe
5340	MasonClient.exe
3200	MasonClient.exe
756	MasonClient.exe
5552	MasonClient.exe
556	MasonClient.exe
2824	MasonClient.exe
4944	MasonClient.exe
4328	MasonClient.exe
5480	MasonClient.exe
5240	MasonClient.exe
1724	MasonClient.exe

Modifies system executable filetype association 2 TTPs 3 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	MasonClient.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runas\command\ = "\"%1\" %*"	MasonClient.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runasuser\command\ = "\"%1\" %*"	MasonClient.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2684263265-1628758615-802431902-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\img.Bmp"	MasonClient.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 3 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	MasonClient.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runas\command\ = "\"%1\" %*"	MasonClient.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runasuser\command\ = "\"%1\" %*"	MasonClient.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4584	schtasks.exe

Suspicious use of AdjustPrivilegeToken 17 IoCs

description	pid	Process
Token: SeDebugPrivilege	1472	MasonClient.exe
Token: SeDebugPrivilege	2164	MasonClient.exe
Token: SeDebugPrivilege	4976	MasonClient.exe
Token: SeDebugPrivilege	1212	MasonClient.exe
Token: SeDebugPrivilege	2908	MasonClient.exe
Token: SeDebugPrivilege	116	MasonClient.exe
Token: SeDebugPrivilege	5340	MasonClient.exe
Token: SeDebugPrivilege	3200	MasonClient.exe
Token: SeDebugPrivilege	756	MasonClient.exe
Token: SeDebugPrivilege	5552	MasonClient.exe
Token: SeDebugPrivilege	556	MasonClient.exe
Token: SeDebugPrivilege	2824	MasonClient.exe
Token: SeDebugPrivilege	4944	MasonClient.exe
Token: SeDebugPrivilege	4328	MasonClient.exe
Token: SeDebugPrivilege	5480	MasonClient.exe
Token: SeDebugPrivilege	5240	MasonClient.exe
Token: SeDebugPrivilege	1724	MasonClient.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1472	MasonClient.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 1472 wrote to memory of 4584	1472	MasonClient.exe	83

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.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
1⤵
- Checks computer location settings
- Modifies system executable filetype association
- Sets desktop wallpaper using registry
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1472
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4584

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2164

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4976

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1212

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2908

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:116

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5340

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3200

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:756

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5552

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:556

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2824

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4944

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4328

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5480

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5240

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1724

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

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MasonClient.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonClient.exe.log
Size 654B
SHA256 d39a78fabca39532fcb85ce908781a75132e1bd01cc50a3b290dd87127837d63
MD5 11c6e74f0561678d2cf7fc075a6cc00c
SHA1 535ee79ba978554abcb98c566235805e7ea18490
SHA512 32c63d67bf512b42e7f57f71287b354200126cb417ef9d869c72e0b9388a7c2f5e3b61f303f1353baa1bf482d0f17e06e23c9f50b2f1babd4d958b6da19c40b0
TLSH
T136F0783432A2E1D5C9127F111C1D298452AF8386B6A0AF1C7A68935DD8261376F313F3
MD5 SHA1 SHA512 TLSH

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MasonClient.exe

Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
Size 84KB
SHA256 7bfc8dd8459c957b7ba52c64ff4724fb0163878e8f9017ee0b8c1435b8e1706f
MD5 129ab07785f9d94213fbce8eaf0a6ec5
SHA1 bb816deb11200da3705efc0a759f9f5be58b6043
SHA512 aad37ad71cb4ff0e955b74fc41fd4ee6fe25750ef5250a6476bf54a4a7dc2d6be2f85964078f8515c4e8a940c24e01b587d5123bc2ba1cb575df7e460435a3e5
SSDEEP 1536:Vm/4nHYMRBsMldzuuiFekVUN6KKfQGkid9aptJTdk2Rp0uRbAeuidmiri:VuCsqdzulgkVSVKmidmth+2lVpmiri
TLSH
T1C283E081CA3D8B6FF142E4F04315FF7B754AD5067BD7B25979D4223E8AB4A920312932
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1472-17-0x000000001ADF0000-0x000000001AE00000-memory.dmp

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memory/1472-1-0x0000000000B50000-0x0000000000B64000-memory.dmp

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memory/1472-6-0x000000001ADF0000-0x000000001AE00000-memory.dmp

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memory/1472-5-0x000000001ADF0000-0x000000001AE00000-memory.dmp

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memory/1472-3-0x000000001ADF0000-0x000000001AE00000-memory.dmp

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memory/1472-47-0x00000000009B0000-0x00000000009BE000-memory.dmp

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memory/1472-46-0x00000000009A0000-0x00000000009A8000-memory.dmp

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memory/1472-44-0x0000000000990000-0x0000000000998000-memory.dmp

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memory/1472-15-0x000000001ADF0000-0x000000001AE00000-memory.dmp

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memory/1472-16-0x000000001ADF0000-0x000000001AE00000-memory.dmp

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memory/1472-4-0x000000001AD10000-0x000000001AD22000-memory.dmp

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memory/1472-0-0x00000000000F0000-0x000000000010C000-memory.dmp

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memory/1472-43-0x0000000000980000-0x0000000000988000-memory.dmp

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memory/2164-11-0x000000001BCC0000-0x000000001BCD0000-memory.dmp

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memory/2164-10-0x000000001BCC0000-0x000000001BCD0000-memory.dmp

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memory/2164-12-0x000000001BCC0000-0x000000001BCD0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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