806ff5a4291ace6371cfa09d584567b7d652d7b28c167a5ab9c4115e9aa4e1f7

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Windows\\system32\\IExplorer.exe\""	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\IExplorer.exe"	Worm.Win32.Ludbaruma.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-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	Worm.Win32.Ludbaruma.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-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	Worm.Win32.Ludbaruma.exe

Disables RegEdit via registry modification 2 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	Worm.Win32.Ludbaruma.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	Worm.Win32.Ludbaruma.exe

Disables use of System Restore points 1 TTPs
evasion

Inhibit System Recovery
T1490

Executes dropped EXE 7 IoCs

pid	Process
4672	xk.exe
3152	IExplorer.exe
4128	WINLOGON.EXE
1280	CSRSS.EXE
1504	SERVICES.EXE
512	LSASS.EXE
4364	SMSS.EXE

Modifies system executable filetype association 2 TTPs 13 IoCs

persistence

Modify Registry

Change Default File Association

T1546.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.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-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSMSGS = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\WINLOGON.EXE"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ServiceAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\SERVICES.EXE"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\LogonAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\CSRSS.EXE"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\System Monitoring = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\LSASS.EXE"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xk = "C:\\Windows\\xk.exe"	Worm.Win32.Ludbaruma.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\IExplorer.exe	Worm.Win32.Ludbaruma.exe
File opened for modification	C:\Windows\SysWOW64\Mig2.scr	Worm.Win32.Ludbaruma.exe
File opened for modification	C:\Windows\SysWOW64\shell.exe	Worm.Win32.Ludbaruma.exe
File created	C:\Windows\SysWOW64\shell.exe	Worm.Win32.Ludbaruma.exe
File created	C:\Windows\SysWOW64\Mig2.scr	Worm.Win32.Ludbaruma.exe
File created	C:\Windows\SysWOW64\IExplorer.exe	Worm.Win32.Ludbaruma.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\xk.exe	Worm.Win32.Ludbaruma.exe
File created	C:\Windows\xk.exe	Worm.Win32.Ludbaruma.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	SMSS.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Worm.Win32.Ludbaruma.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xk.exe
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

Modifies Control Panel 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\Desktop\SCRNSAVE.EXE = "C:\\Windows\\system32\\Mig~mig.SCR"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\Desktop\ScreenSaverIsSecure = "0"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\Desktop\ScreenSaveTimeOut = "600"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\Desktop\	Worm.Win32.Ludbaruma.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\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	Worm.Win32.Ludbaruma.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile	Worm.Win32.Ludbaruma.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4276	Worm.Win32.Ludbaruma.exe
4276	Worm.Win32.Ludbaruma.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
4276	Worm.Win32.Ludbaruma.exe
4672	xk.exe
3152	IExplorer.exe
4128	WINLOGON.EXE
1280	CSRSS.EXE
1504	SERVICES.EXE
512	LSASS.EXE
4364	SMSS.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4276 wrote to memory of 4672	4276	Worm.Win32.Ludbaruma.exe	82
PID 4276 wrote to memory of 4672	4276	Worm.Win32.Ludbaruma.exe	82
PID 4276 wrote to memory of 4672	4276	Worm.Win32.Ludbaruma.exe	82
PID 4276 wrote to memory of 3152	4276	Worm.Win32.Ludbaruma.exe	83
PID 4276 wrote to memory of 3152	4276	Worm.Win32.Ludbaruma.exe	83
PID 4276 wrote to memory of 3152	4276	Worm.Win32.Ludbaruma.exe	83
PID 4276 wrote to memory of 4128	4276	Worm.Win32.Ludbaruma.exe	84
PID 4276 wrote to memory of 4128	4276	Worm.Win32.Ludbaruma.exe	84
PID 4276 wrote to memory of 4128	4276	Worm.Win32.Ludbaruma.exe	84
PID 4276 wrote to memory of 1280	4276	Worm.Win32.Ludbaruma.exe	85
PID 4276 wrote to memory of 1280	4276	Worm.Win32.Ludbaruma.exe	85
PID 4276 wrote to memory of 1280	4276	Worm.Win32.Ludbaruma.exe	85
PID 4276 wrote to memory of 1504	4276	Worm.Win32.Ludbaruma.exe	86
PID 4276 wrote to memory of 1504	4276	Worm.Win32.Ludbaruma.exe	86
PID 4276 wrote to memory of 1504	4276	Worm.Win32.Ludbaruma.exe	86
PID 4276 wrote to memory of 512	4276	Worm.Win32.Ludbaruma.exe	87
PID 4276 wrote to memory of 512	4276	Worm.Win32.Ludbaruma.exe	87
PID 4276 wrote to memory of 512	4276	Worm.Win32.Ludbaruma.exe	87
PID 4276 wrote to memory of 4364	4276	Worm.Win32.Ludbaruma.exe	88
PID 4276 wrote to memory of 4364	4276	Worm.Win32.Ludbaruma.exe	88
PID 4276 wrote to memory of 4364	4276	Worm.Win32.Ludbaruma.exe	88

System policy modification 1 TTPs 4 IoCs

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	Worm.Win32.Ludbaruma.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	Worm.Win32.Ludbaruma.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	Worm.Win32.Ludbaruma.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions = "1"	Worm.Win32.Ludbaruma.exe

C:\Users\Admin\AppData\Local\Temp\Worm.Win32.Ludbaruma.exe
"C:\Users\Admin\AppData\Local\Temp\Worm.Win32.Ludbaruma.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:4276
- C:\Windows\xk.exe
  C:\Windows\xk.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:4672
- 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:3152
- 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:4128
- 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:1280
- 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:1504
- 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:512
- 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:4364

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