Analysis
- user interaction
yes - max time kernel
134s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
16/10/2026, 14:29
General
- Target MasonClient.exe
- Size 48KB
- Sample261016-rtj29svyct
- SHA256 25596e7b6ad36b42fc82b25876b7100f60dedbc219e66e5457a00fb8a96b1bf8
Malware Config
Extracted
-
neptunerat
-
eaf6677858-52804.portmap.host:52804
-
filename
USB.exe
-
group
MasonGroup
-
key
zmW7g49AZ2nXv9Rs
-
rat_name
MasonRAT
Signatures
- Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
- Detects NeptuneRAT stealer 1 IoCs
- Executes dropped EXE 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.
- 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).
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- 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 3 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- 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\tmp5607.tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp5607.tmp.exe"2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /k reg delete HKCR /f3⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\reg.exereg delete HKCR /f4⤵
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-
-
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x0000000000000500 0x00000000000004FC1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
tmp5607.tmp.exe
memory/3764-5-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-2-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-3-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-4-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-0-0x00007FFB4E30F000-0x00007FFB4E310000-memory.dmp
memory/3764-6-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-7-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-8-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-10-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-9-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-13-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-12-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-11-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-14-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/3764-1-0x0000000000600000-0x0000000000612000-memory.dmp
memory/5340-23-0x0000000000A90000-0x0000000000A9A000-memory.dmp
memory/5340-27-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/5340-28-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/5340-29-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp
memory/5340-30-0x00007FFB4E180000-0x00007FFB4EB24000-memory.dmp