Analysis
- max time kernel
141s - max time network
152s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260513-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 2 IoCs
- Disables Task Manager via registry modification
- Checks computer location settings 2 TTPs 4 IoCs
Looks up country code configured in the registry, likely geofence.
- 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 5 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⤵
- 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
-
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C:\Users\Admin\AppData\Local\Temp\tmp39B.tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp39B.tmp.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\MBR2.exe"C:\Users\Admin\AppData\Local\Temp\MBR2.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\MatrixMBR.exe"C:\Windows\System32\MatrixMBR.exe"4⤵
- Checks computer location settings
- 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
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-
-
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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
-
-
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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.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
-
C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x498 0x4681⤵
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
MasonClient.exe.log
GDI.exe
MBR.exe
MBR2.exe
TROLL2.exe
TROLL5.exe
tmp39B.tmp.exe
MasonClient.exe
MatrixMBR.exe
memory/332-90-0x0000000005840000-0x0000000005DE6000-memory.dmp
memory/332-92-0x0000000005220000-0x000000000522A000-memory.dmp
memory/332-91-0x0000000005290000-0x0000000005322000-memory.dmp
memory/332-89-0x0000000000770000-0x0000000000828000-memory.dmp
memory/1012-88-0x00000000007B0000-0x00000000007EA000-memory.dmp
memory/1700-105-0x0000000000400000-0x000000000041D000-memory.dmp
memory/1980-110-0x00000000006D0000-0x0000000000716000-memory.dmp
memory/2144-12-0x000000001B340000-0x000000001B350000-memory.dmp
memory/2144-11-0x000000001B340000-0x000000001B350000-memory.dmp
memory/2144-10-0x000000001B340000-0x000000001B350000-memory.dmp
memory/2856-137-0x0000000000DD0000-0x0000000000DD8000-memory.dmp
memory/4508-24-0x000000001BC40000-0x000000001BC48000-memory.dmp
memory/4508-5-0x000000001B550000-0x000000001B560000-memory.dmp
memory/4508-6-0x000000001B550000-0x000000001B560000-memory.dmp
memory/4508-1-0x0000000000F60000-0x0000000000F74000-memory.dmp
memory/4508-15-0x000000001B550000-0x000000001B560000-memory.dmp
memory/4508-18-0x00000000029B0000-0x00000000029B8000-memory.dmp
memory/4508-4-0x0000000000FA0000-0x0000000000FB2000-memory.dmp
memory/4508-16-0x000000001B550000-0x000000001B560000-memory.dmp
memory/4508-3-0x000000001B550000-0x000000001B560000-memory.dmp
memory/4508-0-0x00000000006A0000-0x00000000006BC000-memory.dmp
memory/4508-17-0x000000001B550000-0x000000001B560000-memory.dmp
memory/5788-44-0x00000000022E0000-0x00000000023C4000-memory.dmp
memory/5788-43-0x0000000000280000-0x000000000036C000-memory.dmp