Analysis
- user interaction
yes - max time kernel
149s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20260130-en - resource tags
- submitted
29/04/2026, 05:59
General
- Target MBR-CipherMasonry.rar
- Size 89KB
- Sample260429-gp615acw4n
- SHA256 e8ff4c03a5031ee6885cba50f08f9a317b64476a2bcec79b33eac9cbe4451d91
Malware Config
Signatures
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- 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.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- 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.
- Modifies registry class 2 IoCs
- Suspicious behavior: GetForegroundWindowSpam 2 IoCs
- Suspicious use of AdjustPrivilegeToken 6 IoCs
- Suspicious use of FindShellTrayWindow 4 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 2 IoCs
Processes
-
C:\Program Files\7-Zip\7zFM.exe"C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\MBR-CipherMasonry.rar"1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\7zOCA3FB5D8\MBR-CipherMasonry.exe"C:\Users\Admin\AppData\Local\Temp\7zOCA3FB5D8\MBR-CipherMasonry.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" / k reg delete HKCR / f3⤵
- System Location Discovery: System Language Discovery
-
-
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C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
-
C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x33c 0x3401⤵
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
MBR-CipherMasonry.exe
memory/900-5-0x000001AA3D400000-0x000001AA3D52A000-memory.dmp
memory/2152-18-0x0000000000070000-0x00000000000A0000-memory.dmp
memory/2152-19-0x0000000004E10000-0x00000000053B4000-memory.dmp
memory/2152-20-0x0000000004900000-0x0000000004992000-memory.dmp
memory/2152-21-0x0000000004A90000-0x0000000004A9A000-memory.dmp
memory/2152-26-0x00000000053C0000-0x0000000005973000-memory.dmp
memory/5036-0-0x000002640EE50000-0x000002640EF65000-memory.dmp
memory/5036-4-0x000002640EE50000-0x000002640EF65000-memory.dmp