masonrat | aa47e94b1143ec98c12abe19fdc3878679e89a01c4c90b2118a9a023327b75fe

Analysis

user interaction
yes
max time kernel
11s
max time network
11s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
19/09/2026, 12:59

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General

Target
MasonClient.exe
Size 58KB
Sample260919-p8fbhs1bph
SHA256 aa47e94b1143ec98c12abe19fdc3878679e89a01c4c90b2118a9a023327b75fe
MD5 6985c91e7eb5f98aec3db38b63c2cea6
SHA1 b37cc58f22660aa806931599d193e3a30f9adfd0
SHA512 977f939f5a382f5453f46b7578079e854dc09d6804312b6e2f4038e6cb4b4e6268b34a94f8629c9a719b5e33b8582231f20fb37366902f1fafc3d6cefc281616
SSDEEP 1536:taYxwbTNjxwjhwY+D72MFNU9kvpbXhM95JS:taYabBscJFe4pTyY
TLSH
T122430A0AF35354ECC51BC6B446EB6673BA31FD6601359F3F1764E6312E10E20AE69B28
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

execution masonrat persistence rat

Malware Config

Extracted

Family

masonrat

c2.freemasonry.dev:36776

Attributes

account_id
7e336fc5111b9854b8f99c9cf93c2a7d

Signatures

Family: masonrat
MasonRAT is a Windows RAT written in C.
rat masonrat

Executes dropped EXE 2 IoCs

pid	Process
1220	MasonClient.exe
5844	MasonClient.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4280978039-528710165-233981602-1000\Software\Microsoft\Windows\CurrentVersion\Run\MasonClient = "C:\\Users\\Admin\\AppData\\Roaming\\MasonClient.exe"	MasonClient.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4280978039-528710165-233981602-1000\Software\Microsoft\Windows\CurrentVersion\Run\MasonClient = "C:\\Users\\Admin\\AppData\\Roaming\\MasonClient.exe"	MasonClient.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3344	schtasks.exe
3120	schtasks.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4656 wrote to memory of 3344	4656	MasonClient.exe	89
PID 1220 wrote to memory of 3120	1220	MasonClient.exe	93

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\MasonClient.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4656
- C:\Windows\SYSTEM32\schtasks.exe
  schtasks.exe /create /f /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3344

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1220
- C:\Windows\SYSTEM32\schtasks.exe
  schtasks.exe /create /f /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3120

C:\Users\Admin\AppData\Roaming\MasonClient.exe
"C:\Users\Admin\AppData\Roaming\MasonClient.exe"
1⤵
- Executes dropped EXE
PID:5844

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

~msnDEV-8dde79944e437042.tmp

Path C:\Users\Admin\AppData\Local\Temp\~msnDEV-8dde79944e437042.tmp
Size 4B
SHA256 bd9d55efca3ff7243a4fb117ad337acda23fc0931f29e92afb46b8550108173b
MD5 9b2d755a1d34fef36ee43e3f9530aa38
SHA1 d3b1f56e6c98fe2ac5a3e817eb3fb15f13915f6e
SHA512 1e0a5d394b63b45385337919a1e67e30567ea964ab9ccc52cc8222c2f01de1f131083f9deae1c0c720abf935e322ffb5c13374d8e15c861119bc783318844a8b
MD5 SHA1 SHA512

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~msnDEV-8dde79944e437042.tmp

Path C:\Users\Admin\AppData\Local\Temp\~msnDEV-8dde79944e437042.tmp
Size 4B
SHA256 8946e60f2bdb6d475e6b74999fc7725c015f1164ba1a477b589975a80c222fc9
MD5 c84653cbe66f61d13457c6a7ef3f5a5c
SHA1 34254be980cb92d5a18947410197e92973612583
SHA512 35f9a70c736cea46803561d084027f3b08f856ef99fb59dfa387d288aeb6a227862f0c5c6d2decabfebbe500626550d3b2fee0d9173b65244d85d26fa3043d19
MD5 SHA1 SHA512

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MasonClient.exe

Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
Size 58KB
SHA256 aa47e94b1143ec98c12abe19fdc3878679e89a01c4c90b2118a9a023327b75fe
MD5 6985c91e7eb5f98aec3db38b63c2cea6
SHA1 b37cc58f22660aa806931599d193e3a30f9adfd0
SHA512 977f939f5a382f5453f46b7578079e854dc09d6804312b6e2f4038e6cb4b4e6268b34a94f8629c9a719b5e33b8582231f20fb37366902f1fafc3d6cefc281616
SSDEEP 1536:taYxwbTNjxwjhwY+D72MFNU9kvpbXhM95JS:taYabBscJFe4pTyY
TLSH
T122430A0AF35354ECC51BC6B446EB6673BA31FD6601359F3F1764E6312E10E20AE69B28
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1220-7-0x00007FF699390000-0x00007FF6993A9000-memory.dmp

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memory/4656-3-0x00007FF6967E0000-0x00007FF6967F9000-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