Analysis
- max time kernel
148s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
23/09/2026, 23:38
General
- Target MasonClient.exe
- Size 48KB
- Sample260923-3m4zmsgc95
- SHA256 b9cdd113799ba3b6f22bc5ed593a71a61f37429b14af020a2acbed2eab6686a8
Malware Config
Extracted
-
neptunerat
-
h2ackercypranos-49474.portmap.host:49474
-
filename
USB.exe
-
group
MasonGroup
-
key
OWKlVlNZmydAbDUL
-
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
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Downloads
MasonClient.exe
memory/3328-0-0x00007FFDAB46F000-0x00007FFDAB470000-memory.dmp
memory/3328-1-0x0000000000050000-0x0000000000062000-memory.dmp
memory/3328-2-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3328-3-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3328-4-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3328-5-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3328-9-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3328-10-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3328-11-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3968-7-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
memory/3968-12-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp