Analysis
- user interaction
yes - max time kernel
10s - max time network
14s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260513-en - resource tags
- submitted
04/08/2026, 10:11
General
- Target masonclient.exe
- Size 375KB
- Sample260804-l8brjsszhy
- SHA256 fa810de277e10d2e363ecc96eb78a89d3dea575c8d77e4defaccae9a02024037
Malware Config
Signatures
- .NET Reactor proctector 64 IoCs
Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 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).
- System Location Discovery: System Language Discovery 1 TTPs 3 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 2 IoCs
- Suspicious use of WriteProcessMemory 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\masonclient.exe"C:\Users\Admin\AppData\Local\Temp\masonclient.exe"1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "masonclient" /tr "C:\Users\Admin\AppData\Roaming\masonclient.exe"2⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\masonclient.exeC:\Users\Admin\AppData\Roaming\masonclient.exe1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
masonclient.exe
memory/2264-0-0x0000000002F50000-0x0000000002F60000-memory.dmp
memory/2264-1-0x00000000053C0000-0x0000000005444000-memory.dmp
memory/2264-2-0x0000000002F50000-0x0000000002F60000-memory.dmp
memory/2264-3-0x00000000059F0000-0x0000000005F96000-memory.dmp
memory/2264-4-0x0000000005440000-0x00000000054C4000-memory.dmp
memory/2264-70-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-34-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-18-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-128-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-130-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-126-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-124-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-122-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-120-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-118-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-114-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-112-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-110-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-108-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-106-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-104-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-102-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-100-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-98-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-96-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-94-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-92-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-90-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-88-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-86-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-84-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-116-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-82-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-80-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-78-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-76-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-74-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-72-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-68-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-66-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-64-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-62-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-60-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-58-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-56-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-54-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-52-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-50-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-48-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-46-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-44-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-42-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-40-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-38-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-36-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-32-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-30-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-28-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-26-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-24-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-22-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-20-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-16-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-14-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-12-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-10-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-8-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-6-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-5-0x0000000005440000-0x00000000054BD000-memory.dmp
memory/2264-1807-0x0000000005560000-0x00000000055FC000-memory.dmp
memory/2264-1808-0x0000000002F50000-0x0000000002F60000-memory.dmp
memory/2264-3615-0x0000000002F50000-0x0000000002F60000-memory.dmp
memory/2832-1812-0x0000000004E00000-0x0000000004E10000-memory.dmp
memory/2832-1811-0x0000000004E00000-0x0000000004E10000-memory.dmp
memory/2832-1810-0x0000000004E00000-0x0000000004E10000-memory.dmp
memory/2832-3616-0x0000000004E00000-0x0000000004E10000-memory.dmp