Analysis
- user interaction
yes - max time kernel
24s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
12/10/2026, 17:28
Errors
General
- Target yhy.exe
- Size 4.9MB
- Sample261012-v2fllayvdx
- SHA256 b68ddd764e106845d08af6d1e13ef271e54e049c9e00d4171d5fded4e7338979
Malware Config
Signatures
- Executes dropped EXE 1 IoCs
- Enumerates connected drives 3 TTPs 1 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- Power Settings 1 TTPs 1 IoCs
powercfg controls all configurable power system settings on a Windows system and can be abused to prevent an infected host from locking or shutting down.
- Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 7 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SetWindowsHookEx 2 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
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C:\Users\Admin\AppData\Local\Temp\yhy.exe"C:\Users\Admin\AppData\Local\Temp\yhy.exe"1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks.exe" /create /f /sc minute /mo 1 /tn "yhy" /tr "C:\Users\Admin\AppData\Roaming\yhy.exe"2⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SYSTEM32\powercfg.exe"powercfg" /h off2⤵
- Power Settings
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SYSTEM32\mountvol.exe"mountvol" Z: /s2⤵
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C:\Windows\SYSTEM32\mountvol.exe"mountvol" Z: /d2⤵
- Enumerates connected drives
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x00000000000004EC 0x00000000000005081⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Roaming\yhy.exeC:\Users\Admin\AppData\Roaming\yhy.exe1⤵
- Executes dropped EXE
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
yhy.exe
memory/4360-0-0x00007FF866A6F000-0x00007FF866A70000-memory.dmp
memory/4360-1-0x0000000000290000-0x000000000076E000-memory.dmp
memory/4360-2-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-5-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-6-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-7-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-8-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-9-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-11-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-12-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4360-13-0x00007FF8668E0000-0x00007FF867284000-memory.dmp