Analysis
- max time kernel
149s - max time network
143s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
27/09/2026, 04:37
General
- Target MasonClient.exe
- Size 50KB
- Sample260927-e8vfbsygjc
- SHA256 00fdb5e1aae6ac635cac9d86b913eaaf02ebe856f576fa6bd84b1349c4a46589
Malware Config
Extracted
-
neptunerat
-
51891:876
-
filename
USB.exe
-
group
MasonGroup
-
key
q49woKB1LAplR8gx
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 2 IoCs
- Executes dropped EXE 3 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 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⤵
- 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
Replay Monitor
Loading Replay Monitor...
Downloads
MasonClient.exe
memory/3636-7-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/3636-10-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-0-0x00007FFD5908F000-0x00007FFD59090000-memory.dmp
memory/4460-1-0x0000000000430000-0x0000000000442000-memory.dmp
memory/4460-2-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-3-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-4-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-5-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-8-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-9-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp
memory/4460-11-0x00007FFD58F00000-0x00007FFD598A4000-memory.dmp