Analysis
- max time kernel
133s - max time network
135s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
31/07/2026, 04:16
Errors
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 2 IoCs
- Disables Task Manager via registry modification
- Executes dropped EXE 10 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.
- Drops file in System32 directory 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 4 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 7 IoCs
- Suspicious use of WriteProcessMemory 8 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\Local\Temp\tmp68BE.tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp68BE.tmp.exe"2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\MBR2.exe"C:\Users\Admin\AppData\Local\Temp\MBR2.exe"3⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\MatrixMBR.exe"C:\Windows\System32\MatrixMBR.exe"4⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\GDI.exe"C:\Users\Admin\AppData\Local\Temp\GDI.exe"5⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
C:\Users\Admin\AppData\Local\Temp\MBR.exe"C:\Users\Admin\AppData\Local\Temp\MBR.exe"5⤵
- Executes dropped EXE
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
-
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 0x00000000000004D8 0x00000000000004CC1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
MasonClient.exe.log
GDI.exe
MBR.exe
MBR2.exe
TROLL2.exe
TROLL5.exe
tmp68BE.tmp.exe
MasonClient.exe
MatrixMBR.exe
memory/484-78-0x0000000005A50000-0x0000000005AE2000-memory.dmp
memory/484-76-0x0000000000F00000-0x0000000000FB8000-memory.dmp
memory/484-77-0x0000000006110000-0x00000000066B6000-memory.dmp
memory/484-79-0x0000000005B10000-0x0000000005B1A000-memory.dmp
memory/1208-21-0x0000000002830000-0x0000000002842000-memory.dmp
memory/2496-39-0x0000000000340000-0x000000000042C000-memory.dmp
memory/2496-40-0x000000001C740000-0x000000001C824000-memory.dmp
memory/2748-75-0x0000000000D50000-0x0000000000D8A000-memory.dmp
memory/2760-15-0x000000001D1F0000-0x000000001D200000-memory.dmp
memory/2760-23-0x000000001D920000-0x000000001D928000-memory.dmp
memory/2760-16-0x0000000002F40000-0x0000000002F48000-memory.dmp
memory/2760-14-0x000000001D1F0000-0x000000001D200000-memory.dmp
memory/2760-0-0x0000000000CC0000-0x0000000000CDC000-memory.dmp
memory/2760-13-0x000000001D1F0000-0x000000001D200000-memory.dmp
memory/2760-5-0x000000001D1F0000-0x000000001D200000-memory.dmp
memory/2760-4-0x0000000002E70000-0x0000000002E82000-memory.dmp
memory/2760-3-0x000000001D1F0000-0x000000001D200000-memory.dmp
memory/2760-1-0x00000000015F0000-0x0000000001604000-memory.dmp
memory/4452-94-0x0000000000A50000-0x0000000000A96000-memory.dmp
memory/5272-89-0x0000000000400000-0x000000000041D000-memory.dmp
memory/5412-112-0x0000000000C60000-0x0000000000C68000-memory.dmp