Analysis
- max time kernel
149s - max time network
150s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
30/09/2026, 02:21
General
- Target MasonClient.exe
- Size 48KB
- Sample260930-cs5j9azdka
- SHA256 3219dd6d62a86b247630a511d4fb8e6bff67bde39904c271e0154545d9614124
Malware Config
Extracted
-
neptunerat
-
spyker234-56781.portmap.host:56781
-
filename
USB.exe
-
group
MasonGroup
-
key
LnIjiR42lzhDBROs
-
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/4920-0-0x00007FF97F35F000-0x00007FF97F360000-memory.dmp
memory/4920-1-0x0000000000F40000-0x0000000000F52000-memory.dmp
memory/4920-2-0x00007FF97F1D0000-0x00007FF97FB74000-memory.dmp
memory/4920-3-0x00007FF97F1D0000-0x00007FF97FB74000-memory.dmp
memory/4920-4-0x00007FF97F1D0000-0x00007FF97FB74000-memory.dmp
memory/4920-5-0x00007FF97F1D0000-0x00007FF97FB74000-memory.dmp
memory/4920-7-0x00007FF97F1D0000-0x00007FF97FB74000-memory.dmp