neptunerat | 73bf9c9a7f57a87a02130bf0bf92ff630e1a61d9dde5b964c373f98d39003998

Analysis

max time kernel
149s
max time network
148s
platform
windows10-ltsc_2021_x64
resource
win10ltsc2021-20260513-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
submitted
31/07/2026, 22:45

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General

Target
MasonClientmmmmmmm.exe
Size 42KB
Sample260731-2plqeahg63
SHA256 73bf9c9a7f57a87a02130bf0bf92ff630e1a61d9dde5b964c373f98d39003998
MD5 1932c386d5a06b8dafc08bf255705873
SHA1 fa6f6a219e07ae3534ca5abeb44fa6f1b986f4f3
SHA512 b811cdb7a2143e70de7711eef87466cf37551ffa0a848f8d0ad4666604e8bf883f37b651992344670caa869cf1ff2fd286fb7c0160c17aa0e5f2837f59aed1c6
SSDEEP 768:yd05gnn353vhnvA73ggwyVa1oxpm9swN3hLOikN2/39p8:yd0qn3tC9nm9sy1O54PT8
TLSH
T11513F7AAB3D85111E3BD76F26EB353498672B6532E2AD7CE4CC1079F2B17B8045805E3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

execution neptunerat persistence trojan

Malware Config

Extracted

Family

neptunerat

Attributes

filename
MasonUSB.exe
group
MasonGroup
key
KN74zbJh2G6NUPmO
localhost
127.0.0.1:3012
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
behavioral2/memory/1264-0-0x0000000000DD0000-0x0000000000DE0000-memory.dmp	family_neptunerat
behavioral2/files/0x001e0000000283d0-2.dat	family_neptunerat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1108628292-2849104889-3743975892-1000\Control Panel\International\Geo\Nation	MasonClientmmmmmmm.exe

Executes dropped EXE 4 IoCs

pid	Process
3956	MasonClientmmmmmmm.exe
4616	MasonClientmmmmmmm.exe
3836	MasonClientmmmmmmm.exe
1096	MasonClientmmmmmmm.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4500	schtasks.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1264	MasonClientmmmmmmm.exe
Token: SeDebugPrivilege	3956	MasonClientmmmmmmm.exe
Token: SeDebugPrivilege	4616	MasonClientmmmmmmm.exe
Token: SeDebugPrivilege	3836	MasonClientmmmmmmm.exe
Token: SeDebugPrivilege	1096	MasonClientmmmmmmm.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 1264 wrote to memory of 4500	1264	MasonClientmmmmmmm.exe	84

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\MasonClientmmmmmmm.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClientmmmmmmm.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1264
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonClientmmmmmmm" /tr "C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4500

C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3956

C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
"C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4616

C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
"C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3836

C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
"C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1096

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

MasonClientmmmmmmm.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonClientmmmmmmm.exe.log
Size 654B
SHA256 d39a78fabca39532fcb85ce908781a75132e1bd01cc50a3b290dd87127837d63
MD5 11c6e74f0561678d2cf7fc075a6cc00c
SHA1 535ee79ba978554abcb98c566235805e7ea18490
SHA512 32c63d67bf512b42e7f57f71287b354200126cb417ef9d869c72e0b9388a7c2f5e3b61f303f1353baa1bf482d0f17e06e23c9f50b2f1babd4d958b6da19c40b0
TLSH
T136F0783432A2E1D5C9127F111C1D298452AF8386B6A0AF1C7A68935DD8261376F313F3
MD5 SHA1 SHA512 TLSH

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MasonClientmmmmmmm.exe

Path C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
Size 42KB
SHA256 73bf9c9a7f57a87a02130bf0bf92ff630e1a61d9dde5b964c373f98d39003998
MD5 1932c386d5a06b8dafc08bf255705873
SHA1 fa6f6a219e07ae3534ca5abeb44fa6f1b986f4f3
SHA512 b811cdb7a2143e70de7711eef87466cf37551ffa0a848f8d0ad4666604e8bf883f37b651992344670caa869cf1ff2fd286fb7c0160c17aa0e5f2837f59aed1c6
SSDEEP 768:yd05gnn353vhnvA73ggwyVa1oxpm9swN3hLOikN2/39p8:yd0qn3tC9nm9sy1O54PT8
TLSH
T11513F7AAB3D85111E3BD76F26EB353498672B6532E2AD7CE4CC1079F2B17B8045805E3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1264-0-0x0000000000DD0000-0x0000000000DE0000-memory.dmp

Download

memory/1264-1-0x0000000002E20000-0x0000000002E30000-memory.dmp

Download

memory/1264-6-0x0000000002E20000-0x0000000002E30000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads