57bf98785249fe473e15b2080237a4e34981b407f6a14e7e0caaa7fcb8b4166c

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Windows\\system32\\IExplorer.exe\""	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\IExplorer.exe"	ccfcf87feeddec8308f2a7d21aecc250N.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-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	ccfcf87feeddec8308f2a7d21aecc250N.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-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	ccfcf87feeddec8308f2a7d21aecc250N.exe

Disables RegEdit via registry modification 2 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	ccfcf87feeddec8308f2a7d21aecc250N.exe

Disables use of System Restore points 1 TTPs
evasion

Inhibit System Recovery
T1490

Executes dropped EXE 7 IoCs

pid	Process
3164	xk.exe
3640	IExplorer.exe
3156	WINLOGON.EXE
1348	CSRSS.EXE
3684	SERVICES.EXE
4020	LSASS.EXE
1364	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\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	ccfcf87feeddec8308f2a7d21aecc250N.exe

UPX packed file 16 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4528-0-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x00070000000234d4-8.dat	upx
behavioral2/files/0x00070000000234d8-106.dat	upx
behavioral2/memory/3164-112-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x00070000000234dc-113.dat	upx
behavioral2/memory/3640-118-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x00070000000234de-121.dat	upx
behavioral2/memory/3156-125-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x00070000000234df-127.dat	upx
behavioral2/memory/1348-132-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/files/0x00070000000234e0-134.dat	upx
behavioral2/memory/3684-139-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4020-145-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4020-147-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/1364-153-0x0000000000400000-0x000000000042F000-memory.dmp	upx
behavioral2/memory/4528-154-0x0000000000400000-0x000000000042F000-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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\LogonAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\CSRSS.EXE"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\System Monitoring = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\LSASS.EXE"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xk = "C:\\Windows\\xk.exe"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSMSGS = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\WINLOGON.EXE"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ServiceAdmin = "C:\\Users\\Admin\\Local Settings\\Application Data\\WINDOWS\\SERVICES.EXE"	ccfcf87feeddec8308f2a7d21aecc250N.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\shell.exe	ccfcf87feeddec8308f2a7d21aecc250N.exe
File created	C:\Windows\SysWOW64\shell.exe	ccfcf87feeddec8308f2a7d21aecc250N.exe
File created	C:\Windows\SysWOW64\Mig2.scr	ccfcf87feeddec8308f2a7d21aecc250N.exe
File created	C:\Windows\SysWOW64\IExplorer.exe	ccfcf87feeddec8308f2a7d21aecc250N.exe
File opened for modification	C:\Windows\SysWOW64\IExplorer.exe	ccfcf87feeddec8308f2a7d21aecc250N.exe
File opened for modification	C:\Windows\SysWOW64\Mig2.scr	ccfcf87feeddec8308f2a7d21aecc250N.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\xk.exe	ccfcf87feeddec8308f2a7d21aecc250N.exe
File created	C:\Windows\xk.exe	ccfcf87feeddec8308f2a7d21aecc250N.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	ccfcf87feeddec8308f2a7d21aecc250N.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
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\Desktop\ScreenSaveTimeOut = "600"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\Desktop\	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\Desktop\SCRNSAVE.EXE = "C:\\Windows\\system32\\Mig~mig.SCR"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\Desktop\ScreenSaverIsSecure = "0"	ccfcf87feeddec8308f2a7d21aecc250N.exe

Modifies registry class 15 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\ = "File Folder"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shell\open\command\ = "\"C:\\Windows\\system32\\shell.exe\" \"%1\" %*"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\piffile\shell\open\command	ccfcf87feeddec8308f2a7d21aecc250N.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4528	ccfcf87feeddec8308f2a7d21aecc250N.exe
4528	ccfcf87feeddec8308f2a7d21aecc250N.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
4528	ccfcf87feeddec8308f2a7d21aecc250N.exe
3164	xk.exe
3640	IExplorer.exe
3156	WINLOGON.EXE
1348	CSRSS.EXE
3684	SERVICES.EXE
4020	LSASS.EXE
1364	SMSS.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 3164	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	84
PID 4528 wrote to memory of 3164	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	84
PID 4528 wrote to memory of 3164	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	84
PID 4528 wrote to memory of 3640	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	85
PID 4528 wrote to memory of 3640	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	85
PID 4528 wrote to memory of 3640	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	85
PID 4528 wrote to memory of 3156	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	86
PID 4528 wrote to memory of 3156	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	86
PID 4528 wrote to memory of 3156	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	86
PID 4528 wrote to memory of 1348	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	88
PID 4528 wrote to memory of 1348	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	88
PID 4528 wrote to memory of 1348	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	88
PID 4528 wrote to memory of 3684	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	89
PID 4528 wrote to memory of 3684	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	89
PID 4528 wrote to memory of 3684	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	89
PID 4528 wrote to memory of 4020	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	90
PID 4528 wrote to memory of 4020	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	90
PID 4528 wrote to memory of 4020	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	90
PID 4528 wrote to memory of 1364	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	91
PID 4528 wrote to memory of 1364	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	91
PID 4528 wrote to memory of 1364	4528	ccfcf87feeddec8308f2a7d21aecc250N.exe	91

System policy modification 1 TTPs 4 IoCs

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	ccfcf87feeddec8308f2a7d21aecc250N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	ccfcf87feeddec8308f2a7d21aecc250N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions = "1"	ccfcf87feeddec8308f2a7d21aecc250N.exe

C:\Users\Admin\AppData\Local\Temp\ccfcf87feeddec8308f2a7d21aecc250N.exe
"C:\Users\Admin\AppData\Local\Temp\ccfcf87feeddec8308f2a7d21aecc250N.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:4528
- C:\Windows\xk.exe
  C:\Windows\xk.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:3164
- 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:3640
- 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:3156
- 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:1348
- 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:3684
- 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:4020
- 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:1364

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