Analysis
- max time kernel
148s - max time network
141s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
10/09/2026, 15:14
General
- Target MasonClient.exe
- Size 42KB
- Sample260910-smrn7stwd1
- SHA256 451bfcaf2e22279d916694aa3431a8a3026a77e85a05cf638fc65efc3b832542
Malware Config
Extracted
-
neptunerat
-
p8mfbrn1en.localto.net:8521
-
filename
USB.exe
-
group
MasonGroup
-
key
GSwY2HRcDK62KUc4
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 2 IoCs
- Executes dropped EXE 4 IoCs
- 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 5 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⤵
- 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
-
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
Replay Monitor
Loading Replay Monitor...
Downloads
MasonClient.exe
memory/2516-7-0x00007FF902660000-0x00007FF903004000-memory.dmp
memory/2516-10-0x00007FF902660000-0x00007FF903004000-memory.dmp
memory/4452-0-0x00007FF9027EF000-0x00007FF9027F0000-memory.dmp
memory/4452-1-0x00000000004B0000-0x00000000004C0000-memory.dmp
memory/4452-2-0x00007FF902660000-0x00007FF903004000-memory.dmp
memory/4452-3-0x00007FF902660000-0x00007FF903004000-memory.dmp
memory/4452-4-0x00007FF902660000-0x00007FF903004000-memory.dmp
memory/4452-5-0x00007FF902660000-0x00007FF903004000-memory.dmp
memory/4452-9-0x00007FF902660000-0x00007FF903004000-memory.dmp