8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2

Processes:

schedule.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe, C:\\Windows\\System32\\schedule.exe"	schedule.exe

Modifies security service 2 TTPs 2 IoCs

Modify Registry

Modify Existing Service

T1031

Processes:

schedule.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wuauserv\Start = "2"	schedule.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "2"	schedule.exe

Modifies system executable filetype association 2 TTPs 1 IoCs
persistence

Modify Registry
T1112

Change Default File Association
T1042

Processes:

schedule.exe

description ioc process

Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "Microsoft Word Document" schedule.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "Microsoft Word Document"	schedule.exe

Modifies visibility of file extensions in Explorer 2 TTPs 1 IoCs

Hidden Files and Directories

Modify Registry

Processes:

schedule.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	schedule.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 1 IoCs

Hidden Files and Directories

Modify Registry

Processes:

schedule.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	schedule.exe

Disables RegEdit via registry modification 1 IoCs

Processes:

schedule.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "0"	schedule.exe

Disables Task Manager via registry modification
evasion
Executes dropped EXE 1 IoCs

Processes:

schedule.exe

pid process

1840 schedule.exe

pid	process
1840	schedule.exe

Drops file in System32 directory 4 IoCs

Processes:

8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\schedule.exe	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe
File created	C:\Windows\SysWOW64\count.txt	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe
File opened for modification	C:\Windows\SysWOW64\count.txt	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe
File created	C:\Windows\SysWOW64\schedule.exe	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe

Modifies registry class 2 IoCs

Processes:

schedule.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile	schedule.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "Microsoft Word Document"	schedule.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exeschedule.exe

pid process

392 8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe
1840 schedule.exe

pid	process
392	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe
1840	schedule.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe

description	pid	process	target process
PID 392 wrote to memory of 1840	392	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe	schedule.exe
PID 392 wrote to memory of 1840	392	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe	schedule.exe
PID 392 wrote to memory of 1840	392	8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe	schedule.exe

C:\Users\Admin\AppData\Local\Temp\8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe
"C:\Users\Admin\AppData\Local\Temp\8a74fd1de988ea633b469b7708274289f29ea40a7fecc7b6f5663b32dc9577a2.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:392

C:\Windows\SysWOW64\schedule.exe
C:\Windows\System32\schedule.exe
2⤵
- Modifies WinLogon for persistence
- Modifies security service
- Modifies system executable filetype association
- Modifies visibility of file extensions in Explorer
- Modifies visiblity of hidden/system files in Explorer
- Disables RegEdit via registry modification
- Executes dropped EXE
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:1840

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Modify Existing Service

1

T1031

Change Default File Association

1

T1042

Hidden Files and Directories

2

Privilege Escalation

Defense Evasion

Modify Registry

5

Hidden Files and Directories

2