Analysis
- max time kernel
150s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
27/09/2026, 05:16
General
- Target MasonClient.exe
- Size 50KB
- Sample260927-fx9xbazbme
- SHA256 27dac225328b8f0f8717dfe2acffa4cd8b012e9ceaaf7259ff29fce8ea07cdf5
Malware Config
Extracted
-
neptunerat
-
nl.portbuddy.tech:40389
-
filename
USB.exe
-
group
MasonGroup
-
key
N118d1bgVbAMPHpa
-
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).
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- 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⤵
- Reads the TCP/IP host and domain name from the registry
- 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:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k GPSvcGroup1⤵
-
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/4668-0-0x00007FFB8794F000-0x00007FFB87950000-memory.dmp
memory/4668-1-0x00000000002A0000-0x00000000002B2000-memory.dmp
memory/4668-2-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp
memory/4668-3-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp
memory/4668-4-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp
memory/4668-6-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp
memory/4668-7-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp
memory/4668-8-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp
memory/4668-9-0x00007FFB877C0000-0x00007FFB88164000-memory.dmp