Analysis
- user interaction
yes - max time kernel
24s - max time network
26s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260513-en - resource tags
- submitted
01/08/2026, 04:34
General
- Target MasonClient.exe
- Size 49KB
- Sample260801-e7l3kadf99
- SHA256 0c362924ba3ba13195c97c37e6d20d916aa46b5de1417060addc18cf8b09cc30
Score
10/10
Malware Config
Extracted
Family
-
neptunerat
C2
-
31.6.50.206:2013
Attributes
-
filename
USB.exe
-
group
MasonGroup
-
key
Pifya1s7UUoG19m0
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 2 IoCs
- Executes dropped EXE 1 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.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
MasonClient.exe
memory/5556-0-0x0000000000440000-0x0000000000452000-memory.dmp
memory/5556-1-0x000000001B350000-0x000000001B360000-memory.dmp
memory/5556-4-0x000000001B350000-0x000000001B360000-memory.dmp