3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\IExplorer.exe"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Windows\\system32\\IExplorer.exe\""	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.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-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.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-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Disables RegEdit via registry modification 2 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Disables use of System Restore points 1 TTPs
evasion

Inhibit System Recovery
T1490

Executes dropped EXE 7 IoCs

pid	Process
1240	xk.exe
4564	IExplorer.exe
1972	WINLOGON.EXE
2980	CSRSS.EXE
4100	SERVICES.EXE
4644	LSASS.EXE
4432	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\ = "File Folder"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.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-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xk = "C:\\Windows\\xk.exe"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSMSGS = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\WINLOGON.EXE"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ServiceAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\SERVICES.EXE"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\LogonAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\CSRSS.EXE"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\System Monitoring = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\LSASS.EXE"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Mig2.scr	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
File created	C:\Windows\SysWOW64\IExplorer.exe	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
File opened for modification	C:\Windows\SysWOW64\IExplorer.exe	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
File opened for modification	C:\Windows\SysWOW64\Mig2.scr	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
File opened for modification	C:\Windows\SysWOW64\shell.exe	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
File created	C:\Windows\SysWOW64\shell.exe	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\xk.exe	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
File created	C:\Windows\xk.exe	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Modifies Control Panel 4 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\Desktop\	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\Desktop\SCRNSAVE.EXE = "C:\\Windows\\system32\\Mig~mig.SCR"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\Desktop\ScreenSaverIsSecure = "0"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\Desktop\ScreenSaveTimeOut = "600"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Modifies registry class 15 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
1240	xk.exe
4564	IExplorer.exe
1972	WINLOGON.EXE
2980	CSRSS.EXE
4100	SERVICES.EXE
4644	LSASS.EXE
4432	SMSS.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3820 wrote to memory of 1240	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	82
PID 3820 wrote to memory of 1240	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	82
PID 3820 wrote to memory of 1240	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	82
PID 3820 wrote to memory of 4564	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	83
PID 3820 wrote to memory of 4564	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	83
PID 3820 wrote to memory of 4564	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	83
PID 3820 wrote to memory of 1972	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	84
PID 3820 wrote to memory of 1972	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	84
PID 3820 wrote to memory of 1972	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	84
PID 3820 wrote to memory of 2980	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	85
PID 3820 wrote to memory of 2980	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	85
PID 3820 wrote to memory of 2980	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	85
PID 3820 wrote to memory of 4100	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	86
PID 3820 wrote to memory of 4100	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	86
PID 3820 wrote to memory of 4100	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	86
PID 3820 wrote to memory of 4644	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	87
PID 3820 wrote to memory of 4644	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	87
PID 3820 wrote to memory of 4644	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	87
PID 3820 wrote to memory of 4432	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	88
PID 3820 wrote to memory of 4432	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	88
PID 3820 wrote to memory of 4432	3820	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe	88

System policy modification 1 TTPs 4 IoCs

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions = "1"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe

C:\Users\Admin\AppData\Local\Temp\3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.exe
"C:\Users\Admin\AppData\Local\Temp\3385b5b2dbf291f71799fecb76f6562d01e99422deb29730b47710d1b22e0536.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
- Modifies Control Panel
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3820
- C:\Windows\xk.exe
  C:\Windows\xk.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1240
- C:\Windows\SysWOW64\IExplorer.exe
  C:\Windows\system32\IExplorer.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:4564
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\WINLOGON.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\WINLOGON.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1972
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\CSRSS.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\CSRSS.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:2980
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\SERVICES.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\SERVICES.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:4100
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\LSASS.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\LSASS.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:4644
- C:\Users\Admin\Local Settings\Application Data\WINDOWS\SMSS.EXE
  "C:\Users\Admin\Local Settings\Application Data\WINDOWS\SMSS.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:4432

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery