sheetrat | cf28747dfa8d48f8367a3a32d1b00bd104d199a6a81c699566fc98d1730ed90e

Analysis

user interaction
yes
max time kernel
900s
max time network
904s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
02/10/2026, 16:49

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General

Target
clun.exe
Size 325KB
Sample261002-vbprksee53
SHA256 cf28747dfa8d48f8367a3a32d1b00bd104d199a6a81c699566fc98d1730ed90e
MD5 c5f321e9ca3a055d4869a6c63ac3e9f8
SHA1 e80798556ae93da864c94ac16be036fb760dd39a
SHA512 d459ebf12445b3be82e02eac4a0f17c7067987abe1cecfb60e34b1ff68f11249d1d21e2c1aa41a93885704a05ef832b940df790342837e705daf9f94a9c42d5c
SSDEEP 6144:pR0qV2q0E/v8e6VlWT8cBHRLysLq/1WpiJ2bLQ:pTVrDv8PVle8cpRNCY
TLSH
T17D64E40CFE91E805CE1E3D7BCFE614104B7125C22E22964632996FFE8B6537658A71BC
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

sheet_refreshedsyfytxacmefx discovery execution sheetrat persistence privilege_escalation trojan

Malware Config

Extracted

Family

sheetrat

Campaign

Sheet_Refreshedsyfytxacmefx

stamina-launch.tun.ply.gg:60372

Signatures

Family: Sheetrat, NonEuclid rat
Sheetrat aka NonEuclid RAT is a trojan written in C#.
trojan sheetrat

Detects Sheetrat obfuscated V1.8 and higher 1 IoCs

Sheetrat aka NonEuclid RAT is a trojan written in C#.

resource	yara_rule
behavioral2/memory/5900-0-0x0000000000440000-0x0000000000498000-memory.dmp	family_sheetrat_v4

Detects Sheetrat obfuscated version 1 IoCs

resource	yara_rule
behavioral2/memory/5900-0-0x0000000000440000-0x0000000000498000-memory.dmp	Sheetrat_v5

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\System32\\userinit.exe,C:\\Windows\\xdwdAutodesk Revit Upgrade.exe"	clun.exe

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.
persistence privilege_escalation

AppInit DLLs
T1546.010

Executes dropped EXE 7 IoCs

pid	Process
5508	xdwdPaint.NET.exe
5924	xdwdAutodesk Revit Upgrade.exe
3232	xdwdPaint.NET.exe
5128	xdwdAutodesk Revit Upgrade.exe
3032	xdwdPaint.NET.exe
6136	xdwdAutodesk Revit Upgrade.exe
4392	xdwdPaint.NET.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	clun.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	clun.exe

Drops file in Windows directory 17 IoCs

description	ioc	Process
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	xdwdAutodesk Revit Upgrade.exe
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	xdwdAutodesk Revit Upgrade.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	xdwdAutodesk Revit Upgrade.exe
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	clun.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	xdwdAutodesk Revit Upgrade.exe
File created	C:\Windows\xdwdAutodesk Revit Upgrade.exe	clun.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	xdwdPaint.NET.exe
File opened for modification	C:\Windows\xdwdAutodesk Revit Upgrade.exe	clun.exe
File created	C:\Windows\xdwdPaint.NET.exe	clun.exe
File created	C:\Windows\xdwd.dll	clun.exe
File opened for modification	C:\Windows\xdwdPaint.NET.exe	xdwdPaint.NET.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 4 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2024	CMD.exe
4284	CMD.exe
4952	CMD.exe
1048	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 14 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	clun.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	clun.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	xdwdAutodesk Revit Upgrade.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	xdwdAutodesk Revit Upgrade.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	xdwdAutodesk Revit Upgrade.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	xdwdAutodesk Revit Upgrade.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	xdwdPaint.NET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	xdwdPaint.NET.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4292	schtasks.exe
6100	schtasks.exe
2088	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5900	clun.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
5508	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe
3232	xdwdPaint.NET.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
5900	clun.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	5900	clun.exe
Token: SeDebugPrivilege	5508	xdwdPaint.NET.exe
Token: SeDebugPrivilege	5924	xdwdAutodesk Revit Upgrade.exe
Token: 33	5428	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	5428	AUDIODG.EXE
Token: SeDebugPrivilege	3232	xdwdPaint.NET.exe
Token: SeDebugPrivilege	5128	xdwdAutodesk Revit Upgrade.exe
Token: SeDebugPrivilege	3032	xdwdPaint.NET.exe
Token: SeDebugPrivilege	4392	xdwdPaint.NET.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 5900 wrote to memory of 2024	5900	clun.exe	90
PID 2024 wrote to memory of 2088	2024	CMD.exe	92
PID 5900 wrote to memory of 4284	5900	clun.exe	93
PID 4284 wrote to memory of 4292	4284	CMD.exe	95
PID 5900 wrote to memory of 4952	5900	clun.exe	96
PID 4952 wrote to memory of 6100	4952	CMD.exe	98
PID 5508 wrote to memory of 5924	5508	xdwdPaint.NET.exe	107
PID 3232 wrote to memory of 5128	3232	xdwdPaint.NET.exe	110
PID 3032 wrote to memory of 6136	3032	xdwdPaint.NET.exe	121
PID 5900 wrote to memory of 1048	5900	clun.exe	125

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\clun.exe
"C:\Users\Admin\AppData\Local\Temp\clun.exe"
1⤵
- Modifies WinLogon for persistence
- Drops desktop.ini file(s)
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5900
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" /C SchTaSKs /CrEAte /F /sc OnLoGoN /rl HighEst /tn "Microsoft Teams Host" /tr "C:\Windows\xdwdAutodesk Revit Upgrade.exe" & exit
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:2024
- - C:\Windows\system32\schtasks.exe
    SchTaSKs /CrEAte /F /sc OnLoGoN /rl HighEst /tn "Microsoft Teams Host" /tr "C:\Windows\xdwdAutodesk Revit Upgrade.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2088
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" /c SchTaSKs /create /f /sc minute /mo -1 /tn "Sage 50" /tr "C:\Windows\xdwdAutodesk Revit Upgrade.exe" /RL HIGHEST & exit
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:4284
- - C:\Windows\system32\schtasks.exe
    SchTaSKs /create /f /sc minute /mo -1 /tn "Sage 50" /tr "C:\Windows\xdwdAutodesk Revit Upgrade.exe" /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4292
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" /c SchTaSKs /create /f /sc minute /mo 5 /tn "Sage 50" /tr "C:\Windows\xdwdPaint.NET.exe" /RL HIGHEST & exit
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:4952
- - C:\Windows\system32\schtasks.exe
    SchTaSKs /create /f /sc minute /mo 5 /tn "Sage 50" /tr "C:\Windows\xdwdPaint.NET.exe" /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:6100
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\hnb40ale.czh.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  PID:1048

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
PID:1552

C:\Windows\xdwdPaint.NET.exe
C:\Windows\xdwdPaint.NET.exe
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5508
- C:\Windows\xdwdAutodesk Revit Upgrade.exe
  "C:\Windows\xdwdAutodesk Revit Upgrade.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - Reads the TCP/IP host and domain name from the registry
  - Suspicious use of AdjustPrivilegeToken
  PID:5924

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x000000000000048C 0x00000000000004B0
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5428

C:\Windows\xdwdPaint.NET.exe
"C:\Windows\xdwdPaint.NET.exe"
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3232
- C:\Windows\xdwdAutodesk Revit Upgrade.exe
  "C:\Windows\xdwdAutodesk Revit Upgrade.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - Reads the TCP/IP host and domain name from the registry
  - Suspicious use of AdjustPrivilegeToken
  PID:5128

C:\Windows\xdwdPaint.NET.exe
"C:\Windows\xdwdPaint.NET.exe"
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3032
- C:\Windows\xdwdAutodesk Revit Upgrade.exe
  "C:\Windows\xdwdAutodesk Revit Upgrade.exe"
  2⤵
  - Executes dropped EXE
  PID:6136

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3272

C:\Windows\System32\SecurityHealthHost.exe
\\?\C:\Windows\System32\SecurityHealthHost.exe {08728914-3F57-4D52-9E31-49DAECA5A80A} -Embedding
1⤵
PID:4032

C:\Windows\xdwdPaint.NET.exe
"C:\Windows\xdwdPaint.NET.exe"
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
PID:4392

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

AppInit DLLs

T1546.010

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

AppInit DLLs

T1546.010

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

xdwd.dll

Path C:\Windows\xdwd.dll
Size 135KB
SHA256 d2eb2730147de33b2450c9bb95ae65944077d560ff0fa619365103cacf8c10b4
MD5 7d28750e12afa4ede4c5f49cccd2d265
SHA1 babd93128d0f1ecf2e93ee83f9d6bce360af5e7b
SHA512 f64bc007f225f4c1e804c74410c884aa9c6e0edd8176b71e7a9116d53ac79dbd57398ed26c4b68d1cf367801360268b64fda08bda4b1d1c78546bb3f43dfc2e2
SSDEEP 3072:t0iX+jLyDcqaH9a6DFHo6MjD7VbZaZaZ8Xwlk4MtWZpt:t07yDSvdoRj2Yp
TLSH
T1CBD34B0772A500BFE1668638C5630A09E777B8211770DBAF33A4429D9F277E19D3AF61
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/5900-117-0x000000001DB50000-0x000000001DBC6000-memory.dmp

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memory/5900-118-0x0000000002750000-0x000000000275C000-memory.dmp

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memory/5900-4-0x00007FFDB6F60000-0x00007FFDB7904000-memory.dmp

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memory/5900-5-0x00007FFDB6F60000-0x00007FFDB7904000-memory.dmp

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memory/5900-37-0x00007FFDB6F60000-0x00007FFDB7904000-memory.dmp

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memory/5900-2-0x00007FFDB6F60000-0x00007FFDB7904000-memory.dmp

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memory/5900-1-0x00007FFDB70EF000-0x00007FFDB70F0000-memory.dmp

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memory/5900-3-0x00007FFDB6F60000-0x00007FFDB7904000-memory.dmp

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memory/5900-119-0x00007FFDB6F60000-0x00007FFDB7904000-memory.dmp

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memory/5900-120-0x000000001B980000-0x000000001B99E000-memory.dmp

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memory/5900-217-0x000000001BE80000-0x000000001BFC6000-memory.dmp

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memory/5900-218-0x000000001CAB0000-0x000000001CB36000-memory.dmp

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memory/5900-0-0x0000000000440000-0x0000000000498000-memory.dmp

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memory/5900-225-0x0000000000BE0000-0x0000000000BEC000-memory.dmp

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memory/5900-228-0x000000001C760000-0x000000001C7E2000-memory.dmp

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