4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Windows\\system32\\IExplorer.exe\""	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\IExplorer.exe"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Modifies visibility of file extensions in Explorer 2 TTPs 1 IoCs

Hidden Files and Directories

T1564.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

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

Hidden Files and Directories

T1564.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Disables RegEdit via registry modification 2 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Disables use of System Restore points 1 TTPs
evasion

Inhibit System Recovery
T1490

Executes dropped EXE 7 IoCs

pid	Process
764	xk.exe
3144	IExplorer.exe
2292	WINLOGON.EXE
1852	CSRSS.EXE
116	SERVICES.EXE
748	LSASS.EXE
4852	SMSS.EXE

Modifies system executable filetype association 2 TTPs 13 IoCs

persistence

Modify Registry

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xk = "C:\\Windows\\xk.exe"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSMSGS = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\WINLOGON.EXE"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ServiceAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\SERVICES.EXE"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\LogonAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\CSRSS.EXE"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\System Monitoring = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\LSASS.EXE"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\shell.exe	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
File created	C:\Windows\SysWOW64\shell.exe	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
File created	C:\Windows\SysWOW64\Mig2.scr	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
File created	C:\Windows\SysWOW64\IExplorer.exe	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
File opened for modification	C:\Windows\SysWOW64\IExplorer.exe	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
File opened for modification	C:\Windows\SysWOW64\Mig2.scr	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\xk.exe	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
File created	C:\Windows\xk.exe	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

System Location Discovery: System Language Discovery 1 TTPs 8 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	IExplorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINLOGON.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	CSRSS.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SERVICES.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	LSASS.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SMSS.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xk.exe

Modifies Control Panel 4 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\Control Panel\Desktop\	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\Control Panel\Desktop\SCRNSAVE.EXE = "C:\\Windows\\system32\\Mig~mig.SCR"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\Control Panel\Desktop\ScreenSaverIsSecure = "0"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1266786182-1874524688-71015548-1000\Control Panel\Desktop\ScreenSaveTimeOut = "600"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Modifies registry class 15 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
764	xk.exe
3144	IExplorer.exe
2292	WINLOGON.EXE
1852	CSRSS.EXE
116	SERVICES.EXE
748	LSASS.EXE
4852	SMSS.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1704 wrote to memory of 764	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	85
PID 1704 wrote to memory of 764	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	85
PID 1704 wrote to memory of 764	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	85
PID 1704 wrote to memory of 3144	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	86
PID 1704 wrote to memory of 3144	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	86
PID 1704 wrote to memory of 3144	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	86
PID 1704 wrote to memory of 2292	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	87
PID 1704 wrote to memory of 2292	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	87
PID 1704 wrote to memory of 2292	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	87
PID 1704 wrote to memory of 1852	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	88
PID 1704 wrote to memory of 1852	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	88
PID 1704 wrote to memory of 1852	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	88
PID 1704 wrote to memory of 116	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	89
PID 1704 wrote to memory of 116	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	89
PID 1704 wrote to memory of 116	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	89
PID 1704 wrote to memory of 748	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	90
PID 1704 wrote to memory of 748	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	90
PID 1704 wrote to memory of 748	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	90
PID 1704 wrote to memory of 4852	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	91
PID 1704 wrote to memory of 4852	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	91
PID 1704 wrote to memory of 4852	1704	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe	91

System policy modification 1 TTPs 4 IoCs

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions = "1"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe

C:\Users\Admin\AppData\Local\Temp\4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe
"C:\Users\Admin\AppData\Local\Temp\4c81438241fba94d32a13a9f7f4d5d1887600a742546787e0531b22dc942c665.exe"
1⤵
- Modifies WinLogon for persistence
- Modifies visibility of file extensions in Explorer
- Modifies visiblity of hidden/system files in Explorer
- Disables RegEdit via registry modification
- Modifies system executable filetype association
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Modifies Control Panel
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1704
- C:\Windows\xk.exe
  C:\Windows\xk.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:764
- C:\Windows\SysWOW64\IExplorer.exe
  C:\Windows\system32\IExplorer.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:3144
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\WINLOGON.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\WINLOGON.EXE"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:2292
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\CSRSS.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\CSRSS.EXE"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:1852
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\SERVICES.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\SERVICES.EXE"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:116
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\LSASS.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\LSASS.EXE"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:748
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\SMSS.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\SMSS.EXE"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:4852

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery