Analysis
- max time kernel
120s - max time network
121s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
16/05/2026, 15:43
General
- Target Client.exe
- Size 681KB
- Sample260516-s58ensft71
- SHA256 f4d4ac02149d3aa87a47f3d9817dfab2c44ed848a3482d7103be89c7a11b789a
Malware Config
Extracted
-
sheetrat
-
2.6.4
-
Sheet_wvnkneyyxn
-
njx1ykwy9g.localto.net:9996
Signatures
- Family: Sheetrat, NonEuclid rat
Sheetrat aka NonEuclid RAT is a trojan written in C#.
- Detects Sheetrat obfuscated V1.8 and higher 1 IoCs
Sheetrat aka NonEuclid RAT is a trojan written in C#.
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
- Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
- Executes dropped EXE 2 IoCs
- Loads dropped DLL 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Drops file in Windows directory 5 IoCs
- 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 64 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 2 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\Client.exe"C:\Users\Admin\AppData\Local\Temp\Client.exe"1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\CMD.exe"CMD" /C SchTaSKs /CrEAte /F /sc OnLoGoN /rl HighEst /tn "RuntimeBroker.exe" /tr "C:\Windows\Sub\RuntimeBroker.exe" & exit2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\schtasks.exeSchTaSKs /CrEAte /F /sc OnLoGoN /rl HighEst /tn "RuntimeBroker.exe" /tr "C:\Windows\Sub\RuntimeBroker.exe"3⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Windows\Sub\RuntimeBroker.exeC:\Windows\Sub\RuntimeBroker.exe1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\Sub\xdwdRuntimeBroker.exeC:\Users\Admin\AppData\Roaming\Sub\xdwdRuntimeBroker.exe1⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Event Triggered Execution
1AppInit DLLs
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
xdwd.dll
memory/2344-0-0x0000000000340000-0x00000000003F0000-memory.dmp
memory/2344-31-0x000000001C310000-0x000000001C320000-memory.dmp
memory/4320-67-0x00007FFFC7C20000-0x00007FFFC7C42000-memory.dmp
memory/4320-69-0x00007FFFC7C20000-0x00007FFFC7C42000-memory.dmp