Analysis
- max time kernel
82s - max time network
150s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
28/07/2026, 02:41
General
- Target MasonClient.exe
- Size 89KB
- Sample260728-c6jvpsef23
- SHA256 c98826b58f963d50141ec7d64b20c0edf725357c2232a8f737f7d840bc439d30
Malware Config
Extracted
-
neptunerat
-
knowledgegroup.co.com:80
-
filename
MasonUSB.exe
-
group
MasonGroup
-
key
XBq6QeqTMD2C4Lqe
-
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 1 IoCs
- Executes dropped EXE 3 IoCs
- Adds Run key to start application 2 TTPs 1 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 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⤵
- Adds Run key to start application
- 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.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:\Users\Admin\AppData\Roaming\MasonClient.exe"C:\Users\Admin\AppData\Roaming\MasonClient.exe"1⤵
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
MasonClient.exe
memory/1364-32-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/1364-20-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/1364-17-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/1364-18-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-13-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-5-0x0000000002F50000-0x0000000002F64000-memory.dmp
memory/5288-8-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-9-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-10-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-11-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-12-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-0-0x0000000000BB0000-0x0000000000BCC000-memory.dmp
memory/5288-6-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-7-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-4-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-2-0x0000000002F20000-0x0000000002F36000-memory.dmp
memory/5288-25-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-26-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-27-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-28-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-29-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-30-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-31-0x00007FF80C530000-0x00007FF80CED4000-memory.dmp
memory/5288-1-0x00007FF80C6BF000-0x00007FF80C6C0000-memory.dmp