Analysis
- user interaction
yes - max time kernel
148s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
31/07/2026, 04:16
General
- Target MasonClient.exe
- Size 84KB
- Sample260731-ewbgpace46
- SHA256 0f334c5f01b11906f55d1868d226c9ef186b956c8993f66567a0467eb8c934ac
Malware Config
Extracted
-
neptunerat
-
24.tcp.cpolar.top:13555
-
filename
USB.exe
-
group
MasonGroup
-
key
vqZC9Fy1QboOrCXC
-
rat_name
MasonRAT
Signatures
- Family: DonutLoader
DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects DonutLoader 1 IoCs
- Detects NeptuneRAT stealer 4 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 4 IoCs
- 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 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\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Checks computer location settings
- 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\Local\Temp\tmp975F.tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp975F.tmp.exe"2⤵
- Executes dropped EXE
-
C:\Users\Admin\AppData\Local\Temp\MBR2.exe"C:\Users\Admin\AppData\Local\Temp\MBR2.exe"3⤵
-
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C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"3⤵
-
-
C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"3⤵
-
-
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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.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x4b4 0x4181⤵
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
MasonClient.exe.log
MBR2.exe
TROLL2.exe
TROLL5.exe
tmp975F.tmp.exe
MasonClient.exe
memory/696-44-0x000000001B8C0000-0x000000001B9A4000-memory.dmp
memory/696-43-0x0000000000AB0000-0x0000000000B9C000-memory.dmp
memory/1476-61-0x0000000000810000-0x000000000084A000-memory.dmp
memory/2252-25-0x00000000015D0000-0x00000000015E2000-memory.dmp
memory/3372-83-0x00000000059F0000-0x00000000059FA000-memory.dmp
memory/3372-82-0x0000000005A00000-0x0000000005A92000-memory.dmp
memory/3372-81-0x00000000060C0000-0x0000000006664000-memory.dmp
memory/3372-72-0x0000000000F50000-0x0000000001008000-memory.dmp
memory/3932-1-0x0000000002160000-0x0000000002174000-memory.dmp
memory/3932-0-0x0000000000100000-0x000000000011C000-memory.dmp
memory/3932-27-0x00000000007A0000-0x00000000007A8000-memory.dmp
memory/3932-17-0x000000001AE90000-0x000000001AEA0000-memory.dmp
memory/3932-6-0x000000001AE90000-0x000000001AEA0000-memory.dmp
memory/3932-5-0x000000001AE90000-0x000000001AEA0000-memory.dmp
memory/3932-4-0x0000000002340000-0x0000000002352000-memory.dmp
memory/3932-18-0x000000001AE90000-0x000000001AEA0000-memory.dmp
memory/3932-3-0x000000001AE90000-0x000000001AEA0000-memory.dmp
memory/3932-20-0x000000001B680000-0x000000001B688000-memory.dmp
memory/3932-19-0x000000001AE90000-0x000000001AEA0000-memory.dmp
memory/4532-16-0x000000001B300000-0x000000001B310000-memory.dmp
memory/4532-15-0x000000001B300000-0x000000001B310000-memory.dmp
memory/4532-12-0x0000000000D70000-0x0000000000D82000-memory.dmp