e90d30455cb81e4e9c86efc71795ea8d0515ba3ca09db7fc772370b80ad3c499

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Windows\\system32\\IExplorer.exe\""	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\IExplorer.exe"	499497eb0b313f9acc8c6b5f0d493d00N.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-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	499497eb0b313f9acc8c6b5f0d493d00N.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-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	499497eb0b313f9acc8c6b5f0d493d00N.exe

Disables RegEdit via registry modification 2 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	499497eb0b313f9acc8c6b5f0d493d00N.exe

Disables use of System Restore points 1 TTPs
evasion

Inhibit System Recovery
T1490

Executes dropped EXE 7 IoCs

pid	Process
3416	xk.exe
2132	IExplorer.exe
4144	WINLOGON.EXE
4224	CSRSS.EXE
1068	SERVICES.EXE
4784	LSASS.EXE
2808	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\exefile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe

UPX packed file 19 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4856-0-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x0007000000023469-8.dat	upx
behavioral2/files/0x000700000002346d-106.dat	upx
behavioral2/memory/3416-112-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x0007000000023471-113.dat	upx
behavioral2/memory/2132-116-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x0007000000023473-118.dat	upx
behavioral2/memory/4144-120-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4144-124-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x0007000000023474-126.dat	upx
behavioral2/memory/4224-129-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4224-132-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x0007000000023475-134.dat	upx
behavioral2/files/0x0007000000023476-139.dat	upx
behavioral2/memory/1068-141-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4784-146-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x0007000000023477-148.dat	upx
behavioral2/memory/2808-152-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4856-154-0x0000000000400000-0x000000000042F000-memory.dmp	upx

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-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xk = "C:\\Windows\\xk.exe"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSMSGS = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\WINLOGON.EXE"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ServiceAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\SERVICES.EXE"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\LogonAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\CSRSS.EXE"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\System Monitoring = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\LSASS.EXE"	499497eb0b313f9acc8c6b5f0d493d00N.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Mig2.scr	499497eb0b313f9acc8c6b5f0d493d00N.exe
File created	C:\Windows\SysWOW64\IExplorer.exe	499497eb0b313f9acc8c6b5f0d493d00N.exe
File opened for modification	C:\Windows\SysWOW64\IExplorer.exe	499497eb0b313f9acc8c6b5f0d493d00N.exe
File opened for modification	C:\Windows\SysWOW64\Mig2.scr	499497eb0b313f9acc8c6b5f0d493d00N.exe
File opened for modification	C:\Windows\SysWOW64\shell.exe	499497eb0b313f9acc8c6b5f0d493d00N.exe
File created	C:\Windows\SysWOW64\shell.exe	499497eb0b313f9acc8c6b5f0d493d00N.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\xk.exe	499497eb0b313f9acc8c6b5f0d493d00N.exe
File opened for modification	C:\Windows\xk.exe	499497eb0b313f9acc8c6b5f0d493d00N.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	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	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	IExplorer.exe

Modifies Control Panel 4 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\Desktop\	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\Desktop\SCRNSAVE.EXE = "C:\\Windows\\system32\\Mig~mig.SCR"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\Desktop\ScreenSaverIsSecure = "0"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\Desktop\ScreenSaveTimeOut = "600"	499497eb0b313f9acc8c6b5f0d493d00N.exe

Modifies registry class 15 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	499497eb0b313f9acc8c6b5f0d493d00N.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4856	499497eb0b313f9acc8c6b5f0d493d00N.exe
4856	499497eb0b313f9acc8c6b5f0d493d00N.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
4856	499497eb0b313f9acc8c6b5f0d493d00N.exe
3416	xk.exe
2132	IExplorer.exe
4144	WINLOGON.EXE
4224	CSRSS.EXE
1068	SERVICES.EXE
4784	LSASS.EXE
2808	SMSS.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4856 wrote to memory of 3416	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	84
PID 4856 wrote to memory of 3416	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	84
PID 4856 wrote to memory of 3416	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	84
PID 4856 wrote to memory of 2132	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	85
PID 4856 wrote to memory of 2132	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	85
PID 4856 wrote to memory of 2132	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	85
PID 4856 wrote to memory of 4144	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	87
PID 4856 wrote to memory of 4144	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	87
PID 4856 wrote to memory of 4144	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	87
PID 4856 wrote to memory of 4224	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	89
PID 4856 wrote to memory of 4224	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	89
PID 4856 wrote to memory of 4224	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	89
PID 4856 wrote to memory of 1068	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	90
PID 4856 wrote to memory of 1068	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	90
PID 4856 wrote to memory of 1068	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	90
PID 4856 wrote to memory of 4784	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	91
PID 4856 wrote to memory of 4784	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	91
PID 4856 wrote to memory of 4784	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	91
PID 4856 wrote to memory of 2808	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	92
PID 4856 wrote to memory of 2808	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	92
PID 4856 wrote to memory of 2808	4856	499497eb0b313f9acc8c6b5f0d493d00N.exe	92

System policy modification 1 TTPs 4 IoCs

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions = "1"	499497eb0b313f9acc8c6b5f0d493d00N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	499497eb0b313f9acc8c6b5f0d493d00N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	499497eb0b313f9acc8c6b5f0d493d00N.exe

C:\Users\Admin\AppData\Local\Temp\499497eb0b313f9acc8c6b5f0d493d00N.exe
"C:\Users\Admin\AppData\Local\Temp\499497eb0b313f9acc8c6b5f0d493d00N.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:4856
- C:\Windows\xk.exe
  C:\Windows\xk.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:3416
- 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:2132
- 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:4144
- 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:4224
- 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:1068
- 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:4784
- 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:2808

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