Analysis Overview
SHA256
5e04a7d94246e4f8286b53fa7ed21756db1b0e6d8526f15747761b85403fab62
Threat Level: Known bad
The file WinLocker.exe was found to be: Known bad.
Malicious Activity Summary
UAC bypass
Sets file execution options in registry
Adds Run key to start application
Writes to the Master Boot Record (MBR)
Checks whether UAC is enabled
Enumerates physical storage devices
Unsigned PE
System policy modification
Suspicious use of SetWindowsHookEx
Suspicious use of AdjustPrivilegeToken
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Suspicious behavior: GetForegroundWindowSpam
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-06-04 13:15
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral2
Detonation Overview
Submitted
2024-06-04 13:15
Reported
2024-06-04 13:18
Platform
win10v2004-20240508-en
Max time kernel
150s
Max time network
150s
Command Line
Signatures
UAC bypass
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Sets file execution options in registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe\Debugger = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinLocker.exe" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinLocker.exe" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Java = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinLocker.exe" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Checks whether UAC is enabled
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeBackupPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
System policy modification
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\HideFastUserSwitching = "1" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe
"C:\Users\Admin\AppData\Local\Temp\WinLocker.exe"
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe explorer.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 232.168.11.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 149.177.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 149.220.183.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 88.210.23.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 11.227.111.52.in-addr.arpa | udp |
| NL | 23.62.61.194:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 205.47.74.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 194.61.62.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 200.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.173.189.20.in-addr.arpa | udp |
Files
memory/4672-0-0x0000000002340000-0x0000000002341000-memory.dmp
memory/4044-11-0x0000000000880000-0x0000000000881000-memory.dmp
memory/4044-12-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-23-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-47-0x0000000002340000-0x0000000002341000-memory.dmp
memory/4672-46-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-68-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-87-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-108-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-131-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-152-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-171-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-190-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-215-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-236-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-255-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-274-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4672-299-0x0000000000400000-0x00000000006CC000-memory.dmp
Analysis: behavioral1
Detonation Overview
Submitted
2024-06-04 13:15
Reported
2024-06-04 13:18
Platform
win7-20240508-en
Max time kernel
37s
Max time network
16s
Command Line
Signatures
UAC bypass
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Sets file execution options in registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe\Debugger = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinLocker.exe" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinLocker.exe" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Java = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinLocker.exe" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Checks whether UAC is enabled
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Writes to the Master Boot Record (MBR)
| Description | Indicator | Process | Target |
| File opened for modification | \??\PhysicalDrive0 | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeBackupPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2176 wrote to memory of 2516 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2176 wrote to memory of 2516 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2176 wrote to memory of 2516 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2176 wrote to memory of 2516 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
System policy modification
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\HideFastUserSwitching = "1" | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe
"C:\Users\Admin\AppData\Local\Temp\WinLocker.exe"
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe explorer.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c TASKKILL /F /FI "Imagename ne WinLocker.exe" /FI "USERNAME eq %USERNAME%
Network
Files
memory/2176-0-0x0000000000230000-0x0000000000231000-memory.dmp
memory/2648-11-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/2176-24-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/2176-43-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/2176-48-0x0000000000230000-0x0000000000231000-memory.dmp
memory/2176-54-0x0000000000400000-0x00000000006CC000-memory.dmp