Analysis
- user interaction
yes - max time kernel
92s - max time network
107s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260911-en - resource tags
- submitted
16/10/2026, 14:29
Errors
General
- Target MasonClient.exe
- Size 48KB
- Sample261016-rtj29svyct
- SHA256 25596e7b6ad36b42fc82b25876b7100f60dedbc219e66e5457a00fb8a96b1bf8
Malware Config
Extracted
-
neptunerat
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eaf6677858-52804.portmap.host:52804
-
filename
USB.exe
-
group
MasonGroup
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key
zmW7g49AZ2nXv9Rs
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rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 1 IoCs
- Disables Task Manager via registry modification
- Checks computer location settings 2 TTPs 4 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 7 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.
- 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.
- Drops file in System32 directory 2 IoCs
- Enumerates video capture drivers 2 TTPs 1 IoCs
Queries the legacy Video for Windows capture drivers. This is commonly abused by RATs to check for available webcams on the system before reporting to their C2.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- 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.
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of WriteProcessMemory 7 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Checks computer location settings
- Enumerates video capture drivers
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\tmpB879.tmp.COM"C:\Users\Admin\AppData\Local\Temp\tmpB879.tmp.COM"2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\MBR2.exe"C:\Users\Admin\AppData\Local\Temp\MBR2.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\MatrixMBR.exe"C:\Windows\System32\MatrixMBR.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\GDI.exe"C:\Users\Admin\AppData\Local\Temp\GDI.exe"5⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
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C:\Users\Admin\AppData\Local\Temp\MBR.exe"C:\Users\Admin\AppData\Local\Temp\MBR.exe"5⤵
- Executes dropped EXE
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
-
-
-
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C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x2f0 0x3081⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
GDI.exe
MBR.exe
MBR2.exe
TROLL2.exe
TROLL5.exe
tmpB879.tmp.COM
MatrixMBR.exe
memory/780-80-0x0000000000DF0000-0x0000000000E36000-memory.dmp
memory/1420-3-0x0000000000F40000-0x0000000000FCE000-memory.dmp
memory/1420-2-0x000000001B420000-0x000000001B430000-memory.dmp
memory/1420-0-0x00000000006C0000-0x00000000006D2000-memory.dmp
memory/1420-1-0x000000001B420000-0x000000001B430000-memory.dmp
memory/2456-54-0x0000000000A70000-0x0000000000AAA000-memory.dmp
memory/3056-62-0x0000000005390000-0x000000000539A000-memory.dmp
memory/3056-61-0x0000000005400000-0x0000000005492000-memory.dmp
memory/3056-60-0x00000000059B0000-0x0000000005F56000-memory.dmp
memory/3056-59-0x00000000008F0000-0x00000000009A8000-memory.dmp
memory/3404-14-0x000000001B990000-0x000000001BA74000-memory.dmp
memory/3404-13-0x000000001BA70000-0x000000001BA80000-memory.dmp
memory/3404-12-0x0000000000CB0000-0x0000000000D9C000-memory.dmp
memory/3484-107-0x00000000008B0000-0x00000000008B8000-memory.dmp
memory/4352-65-0x0000000000400000-0x000000000041D000-memory.dmp