Analysis
- user interaction
yes - max time kernel
38s - max time network
35s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260911-en - resource tags
- submitted
11/10/2026, 16:50
General
- Target MasonClient.exe
- Size 52KB
- Sample261011-vch1estyfs
- SHA256 321efc518de0ef20b1e5be7ad034f13a3d874b1a960857cd653addaaa91df3cd
Score
10/10
Malware Config
Extracted
Family
-
neptunerat
C2
-
193.161.193.99:45108
Attributes
-
filename
USB.exe
-
group
MasonGroup
-
key
LvIlblgIkQ048S8u
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 1 IoCs
- Looks up external IP address via web service 1 TTPs 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- 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
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Downloads
memory/5024-0-0x0000000000D80000-0x0000000000D94000-memory.dmp
memory/5024-1-0x000000001B9B0000-0x000000001B9C0000-memory.dmp