Analysis
- user interaction
yes - max time kernel
150s - max time network
153s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
30/09/2026, 16:11
General
- Target MassonClient.exe
- Size 51KB
- Sample260930-tmycescc66
- SHA256 f5e2a6f21c0a809db55ac77de2ee15af75b9623170a2da06fb972f7f00e160de
Malware Config
Extracted
-
neptunerat
-
7.tcp.vip.cpolar.cn:13366
-
filename
USB.exe
-
group
MasonGroup
-
key
N5PFd2tzBJ8ueFZr
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 2 IoCs
- Executes dropped EXE 4 IoCs
- Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
- 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.
- System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- 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 6 IoCs
- Suspicious use of WriteProcessMemory 2 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\MassonClient.exe"C:\Users\Admin\AppData\Local\Temp\MassonClient.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 "MassonClient" /tr "C:\Users\Admin\AppData\Roaming\MassonClient.exe"2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Local\Temp\tmp37E5.tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp37E5.tmp.exe"2⤵
- Executes dropped EXE
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
-
-
C:\Users\Admin\AppData\Roaming\MassonClient.exeC:\Users\Admin\AppData\Roaming\MassonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k GPSvcGroup1⤵
-
C:\Users\Admin\AppData\Roaming\MassonClient.exe"C:\Users\Admin\AppData\Roaming\MassonClient.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\MassonClient.exe"C:\Users\Admin\AppData\Roaming\MassonClient.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x00000000000004B0 0x00000000000004A81⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
tmp37E5.tmp.exe
tmp74EF.tmp
MassonClient.exe
memory/2536-10-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/2536-8-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/4328-27-0x0000000006400000-0x0000000006492000-memory.dmp
memory/4328-23-0x0000000000B50000-0x0000000000B7E000-memory.dmp
memory/6124-6-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/6124-0-0x00007FFA50ECF000-0x00007FFA50ED0000-memory.dmp
memory/6124-9-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/6124-5-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/6124-4-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/6124-3-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/6124-2-0x00007FFA50D40000-0x00007FFA516E4000-memory.dmp
memory/6124-1-0x0000000000800000-0x0000000000814000-memory.dmp