Analysis
- max time kernel
15s - max time network
17s - platform
windows11-21h2_x64 - resource
win11-20260513-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.
- Executes dropped EXE 2 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 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 3 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⤵
- 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
-
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.log
masonclient.exe
memory/2452-62-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-82-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-2-0x0000000005780000-0x0000000005790000-memory.dmp
memory/2452-3-0x0000000005D40000-0x00000000062E6000-memory.dmp
memory/2452-4-0x0000000005650000-0x00000000056D4000-memory.dmp
memory/2452-5-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-46-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-128-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-130-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-126-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-125-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-122-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-120-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-118-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-116-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-114-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-112-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-108-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-106-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-104-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-103-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-98-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-96-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-94-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-93-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-90-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-88-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-86-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-60-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-80-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-78-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-76-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-74-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-72-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-70-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-68-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-66-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-64-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-1-0x0000000005590000-0x0000000005614000-memory.dmp
memory/2452-0-0x0000000005780000-0x0000000005790000-memory.dmp
memory/2452-16-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-56-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-110-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-100-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-84-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-54-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-52-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-50-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-48-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-44-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-42-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-40-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-38-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-36-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-34-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-32-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-30-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-28-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-26-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-24-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-22-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-20-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-18-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-58-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-14-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-12-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-10-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-8-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-6-0x0000000005650000-0x00000000056CD000-memory.dmp
memory/2452-1807-0x0000000005780000-0x0000000005790000-memory.dmp
memory/2452-1808-0x0000000005790000-0x000000000582C000-memory.dmp
memory/2452-2801-0x0000000005780000-0x0000000005790000-memory.dmp
memory/2452-3619-0x0000000005780000-0x0000000005790000-memory.dmp
memory/2452-3618-0x0000000005780000-0x0000000005790000-memory.dmp
memory/2452-5426-0x0000000005780000-0x0000000005790000-memory.dmp
memory/4992-1814-0x00000000059D0000-0x00000000059E0000-memory.dmp
memory/4992-1813-0x00000000059D0000-0x00000000059E0000-memory.dmp
memory/4992-1812-0x00000000059D0000-0x00000000059E0000-memory.dmp
memory/4992-3620-0x00000000059D0000-0x00000000059E0000-memory.dmp