Analysis
- max time kernel
149s - max time network
153s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
04/08/2026, 17:48
General
- Target MasonClient.exe
- Size 49KB
- Sample260804-wde6lawfja
- SHA256 a8a97d85edd62356d8f2bb0f83ffda46b6d87ed06ed4d17437196335ffee43c1
Malware Config
Extracted
-
neptunerat
-
9foocyvr0i.localto.net:2702
-
filename
USB.exe
-
group
MasonGroup
-
key
tcPsjbVJdQABoUkV
-
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
- 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.
- 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
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Downloads
MasonClient.exe
memory/3056-8-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-14-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-3-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-4-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-5-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-6-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-7-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-0-0x00007FFEB781F000-0x00007FFEB7820000-memory.dmp
memory/3056-2-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-18-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-9-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-17-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-16-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/3056-1-0x0000000000CA0000-0x0000000000CB2000-memory.dmp
memory/3056-15-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/5584-13-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/5584-12-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp
memory/5584-11-0x00007FFEB7690000-0x00007FFEB8034000-memory.dmp