neptunerat | fd63b76cd6af8482f19ee63275e3488c1b41f5edb56a7d22fc99b1e9e8ac5549

Analysis

user interaction
yes
max time kernel
383s
max time network
385s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
20/08/2026, 19:55

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Reason

Machine shutdown

General

Target
MasonClient.exe
Size 48KB
Sample260820-ynfafsvala
SHA256 fd63b76cd6af8482f19ee63275e3488c1b41f5edb56a7d22fc99b1e9e8ac5549
MD5 1fed7431ce6df6975cfa46e0107ee5a6
SHA1 20a90f84c792a0d9ad166ba6900888f60e12c621
SHA512 de27ca1ae7f42118a33df8dbb699c9df3e5bb373689114954d2661ab3905963d230cfa43b806aaa60d97bb86bd4beceaef03c027e1151abafa807e964f0c2623
SSDEEP 1536:MyjlRQrKzfPJhh9qHSoKLsd05x0wziNw2VEVL+E2RMsxpYmFcbvWq0/1OOu6:MyjlRCO3RLsd070wziNw2VEVL+E2RMsH
TLSH
T1A423C49CA3D94131E4BE57B21D77424893B4AAA38467D79F7CC400CA2B26B95CB41EF3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

neptunerat trojan

Malware Config

Extracted

Family

neptunerat

john12dqr23-37470.portmap.host:37470

Attributes

filename
USB.exe
group
MasonGroup
key
jfsOTWjKXbd66nfI
rat_name
MasonRAT

Signatures

Family: NeptuneRAT, MasonRAT
NeptuneRAT aka MasonRAT is a trojan written in C#.
trojan neptunerat

Detects NeptuneRAT stealer 2 IoCs

resource	yara_rule
behavioral1/memory/4924-0-0x0000000000770000-0x0000000000782000-memory.dmp	family_neptunerat
behavioral1/memory/4924-1-0x000000001B430000-0x000000001B440000-memory.dmp	family_neptunerat

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "201"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4924	MasonClient.exe
Token: SeShutdownPrivilege	2108	shutdown.exe
Token: SeRemoteShutdownPrivilege	2108	shutdown.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4924	MasonClient.exe
4924	MasonClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
644	LogonUI.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 4924 wrote to memory of 2108	4924	MasonClient.exe	96

C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:4924
- C:\Windows\SYSTEM32\shutdown.exe
  shutdown.exe /f /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2108

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3950055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:644

Network

MITRE ATT&CK Matrix

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Downloads

memory/4924-0-0x0000000000770000-0x0000000000782000-memory.dmp

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memory/4924-1-0x000000001B430000-0x000000001B440000-memory.dmp

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memory/4924-2-0x000000001B430000-0x000000001B440000-memory.dmp

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memory/4924-3-0x0000000000DD0000-0x0000000000DDE000-memory.dmp

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Analysis

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Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix

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Downloads