Analysis
- max time kernel
148s - max time network
154s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
04/08/2026, 18:22
General
- Target MasonClient.exe
- Size 52KB
- Sample260804-w1b3fsfb62
- SHA256 95affb738568432dd10d92083348a40b84bfc0b13af01c96a7b8381f1957f322
Malware Config
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/4828-6-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-2-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-3-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-4-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-5-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-0-0x00007FFE4D74F000-0x00007FFE4D750000-memory.dmp
memory/4828-7-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-8-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-9-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-10-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp
memory/4828-1-0x0000000000FE0000-0x0000000000FF4000-memory.dmp
memory/4828-12-0x00007FFE4D5C0000-0x00007FFE4DF64000-memory.dmp