Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20260130-en - resource tags
- submitted
10/05/2026, 16:57
General
- Target MasonClient.exe
- Size 44KB
- Sample260510-vglbcabz5s
- SHA256 0c1ffbdc5e9004f75db30238424827aabdb4355b1ce59a57702dbaf7e825ae2d
Malware Config
Signatures
- Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Drops startup file 2 IoCs
- Executes dropped EXE 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 3 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious use of AdjustPrivilegeToken 8 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
- 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.
Processes
-
C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\MasonClient.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'MasonClient.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\MasonClient.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"2⤵
- Scheduled Task/Job: Scheduled Task
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C:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Roaming\MasonClient.exeC:\Users\Admin\AppData\Roaming\MasonClient.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
1PowerShell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
MasonClient.exe.log
powershell.exe.log
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
__PSScriptPolicyTest_ciu2ia5y.lx2.ps1
MasonClient.exe
memory/2428-67-0x000000001BA30000-0x000000001BB5A000-memory.dmp
memory/2428-68-0x00000000016D0000-0x00000000016DC000-memory.dmp
memory/3092-14-0x000002CCE54E0000-0x000002CCE5502000-memory.dmp
memory/3092-19-0x00007FFC29F50000-0x00007FFC2A0F1000-memory.dmp
memory/3092-18-0x000002CCE5510000-0x000002CCE557B000-memory.dmp
memory/3092-17-0x000002CCCCEE0000-0x000002CCCCEEC000-memory.dmp
memory/3092-6-0x00007FFC29F50000-0x00007FFC2A0F1000-memory.dmp
memory/3808-0-0x0000000000DC0000-0x0000000000DD2000-memory.dmp
memory/3808-61-0x000000001B990000-0x000000001BABA000-memory.dmp
memory/3808-3-0x0000000001670000-0x000000000167C000-memory.dmp
memory/3808-2-0x000000001B990000-0x000000001BABA000-memory.dmp
memory/3808-1-0x00007FFC29F50000-0x00007FFC2A0F1000-memory.dmp
memory/4124-83-0x00000000008F0000-0x00000000008FC000-memory.dmp
memory/4124-82-0x000000001AC10000-0x000000001AD3A000-memory.dmp
memory/4808-30-0x0000018B721C0000-0x0000018B721CC000-memory.dmp
memory/4808-31-0x0000018B74100000-0x0000018B7416B000-memory.dmp
memory/5012-41-0x0000026A391A0000-0x0000026A3924C000-memory.dmp
memory/5012-42-0x0000026A393B0000-0x0000026A393BC000-memory.dmp
memory/5076-53-0x0000000000F80000-0x0000000000F8C000-memory.dmp
memory/5076-52-0x000000001B070000-0x000000001B19A000-memory.dmp