Analysis
- max time kernel
150s - max time network
128s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
30/10/2026, 00:58
General
- Target Releases/MasonChess.exe
- Size 1.3MB
- Sample261030-bbrrdsvw3p
- SHA256 9be0c047cea06ab24bdb1711ca7d4608e179826d079206ed36a1aea830cc5149
Malware Config
Signatures
- Executes dropped EXE 1 IoCs
- Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
- Direct Volume Access: Opens a physical disk for reading 1 TTPs 1 IoCs
Opens a raw handle to a physical disk, which bypasses file system access controls and is used for disk inspection, anti-VM checks and privilege checks.
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Releases\MasonChess.exe"C:\Users\Admin\AppData\Local\Temp\Releases\MasonChess.exe"1⤵
- Writes to the Master Boot Record (MBR)
- Direct Volume Access: Opens a physical disk for reading
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\Releases\nasm.exe"nasm.exe" -f bin mbr_temp.asm -o mbr_temp.bin2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x0000000000000504 0x00000000000005081⤵
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k GPSvcGroup1⤵
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
mbr_temp.asm
mbr_temp.bin
nasm.exe
memory/4612-15-0x0000000000400000-0x0000000000539000-memory.dmp
memory/4896-0-0x0000000074872000-0x0000000074873000-memory.dmp
memory/4896-1-0x0000000000020000-0x0000000000172000-memory.dmp
memory/4896-2-0x0000000005320000-0x00000000058DA000-memory.dmp
memory/4896-3-0x0000000004C90000-0x0000000004D22000-memory.dmp
memory/4896-4-0x0000000004C80000-0x0000000004C8A000-memory.dmp
memory/4896-5-0x0000000074860000-0x000000007501C000-memory.dmp
memory/4896-17-0x0000000074872000-0x0000000074873000-memory.dmp
memory/4896-18-0x0000000074860000-0x000000007501C000-memory.dmp