Analysis
- user interaction
yes - max time kernel
149s - max time network
151s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260513-en - resource tags
- submitted
23/06/2026, 12:17
General
- Target MasonClient.exe
- Size 794KB
- Sample260623-pf13hscy5v
- SHA256 d22c3258933f46b79f87f0b8f6635c943306cfddf69f37b438e6d7a3436ccd22
Malware Config
Extracted
-
neptunerat
-
az779ax-52752.portmap.host:52752
Extracted
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xred
-
xred.mooo.com
-
payload_url
http://freedns.afraid.org/api/?action=getdyndns&sha=a30fa98efc092684e8d1c5cff797bcc613562978
https://docs.google.com/uc?id=0BxsMXGfPIZfSVlVsOGlEVGxuZVk&export=download
https://www.dropbox.com/s/n1w4p8gc6jzo0sg/SUpdate.ini?dl=1
http://xred.site50.net/syn/SUpdate.ini
https://docs.google.com/uc?id=0BxsMXGfPIZfSVzUyaHFYVkQxeFk&export=download
https://www.dropbox.com/s/zhp1b06imehwylq/Synaptics.rar?dl=1
http://xred.site50.net/syn/Synaptics.rar
https://docs.google.com/uc?id=0BxsMXGfPIZfSTmlVYkxhSDg5TzQ&export=download
https://www.dropbox.com/s/fzj752whr3ontsm/SSLLibrary.dll?dl=1
http://xred.site50.net/syn/SSLLibrary.dll
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Family: Xred
Xred is backdoor written in Delphi.
- Detects NeptuneRAT stealer 3 IoCs
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 6 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 3 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 3 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Enumerates system info in registry 2 TTPs 3 IoCs
- Modifies registry class 1 IoCs
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of SetWindowsHookEx 4 IoCs
- Suspicious use of WriteProcessMemory 3 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\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\._cache_MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\._cache_MasonClient.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- 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 "._cache_MasonClient" /tr "C:\Users\Admin\AppData\Roaming\._cache_MasonClient.exe"3⤵
- Scheduled Task/Job: Scheduled Task
-
-
-
C:\ProgramData\Synaptics\Synaptics.exe"C:\ProgramData\Synaptics\Synaptics.exe" InjUpdate2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
-
C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" /automation -Embedding1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
-
C:\ProgramData\Synaptics\Synaptics.exeC:\ProgramData\Synaptics\Synaptics.exe1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
C:\Users\Admin\AppData\Roaming\._cache_MasonClient.exeC:\Users\Admin\AppData\Roaming\._cache_MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\._cache_MasonClient.exe"C:\Users\Admin\AppData\Roaming\._cache_MasonClient.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\._cache_MasonClient.exe"C:\Users\Admin\AppData\Roaming\._cache_MasonClient.exe"1⤵
- Executes dropped EXE
- 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
Synaptics.exe
._cache_MasonClient.exe.log
._cache_MasonClient.exe
ox9QBn3J.xlsm
memory/4040-137-0x0000000000400000-0x00000000004C0000-memory.dmp
memory/4736-130-0x0000000000400000-0x00000000004CD000-memory.dmp
memory/4736-0-0x0000000002350000-0x0000000002351000-memory.dmp
memory/4736-1-0x00000000004A0000-0x00000000004A1000-memory.dmp
memory/5028-68-0x00000000004C0000-0x00000000004D2000-memory.dmp
memory/5028-138-0x000000001BCA0000-0x000000001BCB0000-memory.dmp
memory/5028-153-0x000000001BCA0000-0x000000001BCB0000-memory.dmp
memory/5352-133-0x00007FF7EBFF0000-0x00007FF7EC000000-memory.dmp
memory/5352-132-0x00007FF7EBFF0000-0x00007FF7EC000000-memory.dmp
memory/5352-135-0x00007FF7EBFF0000-0x00007FF7EC000000-memory.dmp
memory/5352-139-0x00007FF7E9CC0000-0x00007FF7E9CD0000-memory.dmp
memory/5352-140-0x00007FF7E9CC0000-0x00007FF7E9CD0000-memory.dmp
memory/5352-134-0x00007FF7EBFF0000-0x00007FF7EC000000-memory.dmp
memory/5352-136-0x00007FF7EBFF0000-0x00007FF7EC000000-memory.dmp
memory/5404-152-0x0000000000400000-0x00000000004C0000-memory.dmp
memory/5404-165-0x0000000000400000-0x00000000004C0000-memory.dmp
memory/5404-187-0x0000000000400000-0x00000000004C0000-memory.dmp