Analysis
- user interaction
yes - max time kernel
149s - max time network
154s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
01/09/2026, 17:02
General
- Target NullCore Executor.exe
- Size 142KB
- Sample260901-vj93gsshme
- SHA256 e060c0af464ce7ec1d74ce8246814e2fb184ba831a446cb9198f0ee1f4486bd1
Malware Config
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Family: Xworm
Xworm is a remote access trojan written in C#.
- Detect Xworm Payload 2 IoCs
- Detects NeptuneRAT stealer 2 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Creates a file in the Startup directory 1 TTPs 2 IoCs
A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.
- Executes dropped EXE 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Sets desktop wallpaper using registry 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\NullCore Executor.exe"C:\Users\Admin\AppData\Local\Temp\NullCore Executor.exe"1⤵
- Checks computer location settings
- Creates a file in the Startup directory
- Adds Run key to start application
- Sets desktop wallpaper using registry
- 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 "NullCore Executor" /tr "C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"C:\Users\Admin\AppData\Roaming\NullCore Executor.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
NullCore Executor.exe.log
NullCore Executor.exe
memory/4080-0-0x00000000007F0000-0x0000000000818000-memory.dmp
memory/4080-4-0x0000000001000000-0x0000000001010000-memory.dmp
memory/4080-8-0x0000000001000000-0x0000000001010000-memory.dmp
memory/4080-11-0x0000000000E50000-0x0000000000E58000-memory.dmp