Analysis
- max time kernel
149s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
02/10/2026, 21:48
General
- Target MasonClient.exe
- Size 49KB
- Sample261002-1nwcsaws8m
- SHA256 0cae4c00024c8b51e7f3c2839339dcd0f2ccc2c10ab4280d8dfa5ea5281044ac
Malware Config
Extracted
-
neptunerat
-
filename
USB.exe
-
group
MasonGroup
-
key
CnsrymCuWKl5AbHg
-
private_ip
192.168.0.9:4213
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 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.
- 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.
- Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
memory/2692-0-0x00007FFE8D00F000-0x00007FFE8D010000-memory.dmp
memory/2692-1-0x0000000000480000-0x0000000000492000-memory.dmp
memory/2692-2-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-3-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-4-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-5-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-6-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-7-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-8-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-9-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-10-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-11-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-12-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-13-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-14-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-15-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp
memory/2692-16-0x00007FFE8CE80000-0x00007FFE8D824000-memory.dmp