Analysis
- user interaction
yes - max time kernel
150s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
30/07/2026, 05:58
General
- Target MasonClient.exe
- Size 87KB
- Sample260730-gpkswscg52
- SHA256 d68cef094b57d504acecdde26bca8276bb5552a7da481b3b55a03d08cda68725
Malware Config
Signatures
- Family: DonutLoader
DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects DonutLoader 1 IoCs
- Detects NeptuneRAT stealer 1 IoCs
- Executes dropped EXE 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Looks up external IP address via web service 1 TTPs 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of WriteProcessMemory 1 IoCs
- 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\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
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
-
-
C:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\MasonClient.exe"C:\Users\Admin\AppData\Roaming\MasonClient.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\MasonClient.exe"C:\Users\Admin\AppData\Roaming\MasonClient.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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
MasonClient.exe
memory/3896-8-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-11-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-4-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-5-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-6-0x00000000023D0000-0x00000000023E4000-memory.dmp
memory/3896-7-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-9-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-0-0x00007FFBB062F000-0x00007FFBB0630000-memory.dmp
memory/3896-2-0x0000000000A50000-0x0000000000A65000-memory.dmp
memory/3896-12-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-10-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-13-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/3896-1-0x00000000001D0000-0x00000000001EC000-memory.dmp
memory/5928-17-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/5928-18-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/5928-20-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp
memory/5928-21-0x00007FFBB04A0000-0x00007FFBB0E44000-memory.dmp