Analysis
- user interaction
yes - max time kernel
898s - max time network
895s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
31/07/2026, 04:04
General
- Target MasonClient.exe
- Size 84KB
- Sample260731-enfrfacd74
- SHA256 ecbeaa3ddac02f621f8d2d8a70b816bb8dade6388a54532daf96da5bf16db31e
Malware Config
Extracted
-
neptunerat
-
12.tcp.vip.cpolar.cn:1017
-
filename
MasonUSB.exe
-
group
MasonGroup
-
key
3Y5b0X0lUQGFW7ig
-
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 9 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 16 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 17 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⤵
- 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\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:\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:\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:\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:\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:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
MasonClient.exe.log
MasonClient.exe
memory/868-13-0x000000001AF80000-0x000000001AF90000-memory.dmp
memory/868-14-0x000000001AF80000-0x000000001AF90000-memory.dmp
memory/868-15-0x000000001AF80000-0x000000001AF90000-memory.dmp
memory/868-12-0x0000000002320000-0x0000000002332000-memory.dmp
memory/1300-4-0x0000000002A60000-0x0000000002A72000-memory.dmp
memory/1300-20-0x000000001B5F0000-0x000000001B600000-memory.dmp
memory/1300-6-0x000000001B5F0000-0x000000001B600000-memory.dmp
memory/1300-5-0x000000001B5F0000-0x000000001B600000-memory.dmp
memory/1300-3-0x000000001B5F0000-0x000000001B600000-memory.dmp
memory/1300-19-0x000000001B5F0000-0x000000001B600000-memory.dmp
memory/1300-18-0x000000001B5F0000-0x000000001B600000-memory.dmp
memory/1300-1-0x0000000000EC0000-0x0000000000ED4000-memory.dmp
memory/1300-0-0x0000000000810000-0x000000000082C000-memory.dmp
memory/2352-46-0x00000000016A0000-0x00000000016B2000-memory.dmp
memory/3212-86-0x00000000016A0000-0x00000000016B2000-memory.dmp
memory/4312-68-0x0000000002830000-0x0000000002842000-memory.dmp
memory/4624-77-0x0000000000CB0000-0x0000000000CC2000-memory.dmp
memory/4996-29-0x0000000000F70000-0x0000000000F82000-memory.dmp
memory/5084-59-0x0000000002B90000-0x0000000002BA2000-memory.dmp