Analysis
- max time kernel
149s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
27/07/2026, 12:17
General
- Target MasonClient.exe
- Size 49KB
- Sample260727-pf13hs1gpf
- SHA256 4d66e54c413606ce3057d31895a2fe551442f54f346bfab25ec97f575c59adc1
Malware Config
Extracted
-
neptunerat
-
qhtny-38745.portmap.host:38745
-
filename
USB.exe
-
group
MasonGroup
-
key
vG4iyTiuVnVY0v07
-
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/2868-6-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-8-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-3-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-4-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-1-0x00000000000C0000-0x00000000000D2000-memory.dmp
memory/2868-0-0x00007FF8C7C6F000-0x00007FF8C7C70000-memory.dmp
memory/2868-7-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-2-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-9-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-10-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-11-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-12-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-13-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp
memory/2868-14-0x00007FF8C7AE0000-0x00007FF8C8484000-memory.dmp