Analysis Overview
SHA256
3cee8d85cbc8ade23c6a98f450108bbbf3ca30f41ef5286eb6ed7fa1127e04c9
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
Checks whether UAC is enabled
Writes to the Master Boot Record (MBR)
Enumerates physical storage devices
Unsigned PE
Kills process with taskkill
System policy modification
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Suspicious behavior: EnumeratesProcesses
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-06-04 13:57
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-06-04 13:57
Reported
2024-06-04 14:00
Platform
win7-20240221-en
Max time kernel
16s
Max time network
17s
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 |
| 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 |
| 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 |
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
Kills process with taskkill
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\taskkill.exe | N/A |
Suspicious behavior: EnumeratesProcesses
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 |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\taskkill.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 2172 wrote to memory of 2548 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2172 wrote to memory of 2548 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2172 wrote to memory of 2548 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2172 wrote to memory of 2548 | N/A | C:\Users\Admin\AppData\Local\Temp\WinLocker.exe | C:\Windows\SysWOW64\cmd.exe |
| PID 2548 wrote to memory of 2700 | N/A | C:\Windows\SysWOW64\cmd.exe | C:\Windows\SysWOW64\taskkill.exe |
| PID 2548 wrote to memory of 2700 | N/A | C:\Windows\SysWOW64\cmd.exe | C:\Windows\SysWOW64\taskkill.exe |
| PID 2548 wrote to memory of 2700 | N/A | C:\Windows\SysWOW64\cmd.exe | C:\Windows\SysWOW64\taskkill.exe |
| PID 2548 wrote to memory of 2700 | N/A | C:\Windows\SysWOW64\cmd.exe | C:\Windows\SysWOW64\taskkill.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:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c TASKKILL /F /FI "Imagename ne WinLocker.exe" /FI "USERNAME eq %USERNAME%
C:\Windows\SysWOW64\taskkill.exe
TASKKILL /F /FI "Imagename ne WinLocker.exe" /FI "USERNAME eq Admin
C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe
C:\Users\Admin\AppData\Local\Temp\WinLocker.exe explorer.exe
Network
Files
memory/2172-0-0x0000000000230000-0x0000000000231000-memory.dmp
memory/2392-10-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/2172-11-0x0000000000400000-0x00000000006CC000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-06-04 13:57
Reported
2024-06-04 14:00
Platform
win10v2004-20240508-en
Max time kernel
150s
Max time network
151s
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 |
| 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 |
| 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 |
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 |
| 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
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 131.253.33.237:443 | g.bing.com | tcp |
| NL | 23.62.61.194:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | 67.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.33.253.131.in-addr.arpa | udp |
| NL | 23.62.61.194:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | 194.61.62.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 104.219.191.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 103.169.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 22.236.111.52.in-addr.arpa | udp |
| 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 | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 67.112.168.52.in-addr.arpa | udp |
Files
memory/4820-0-0x00000000008A0000-0x00000000008A1000-memory.dmp
memory/2076-11-0x00000000008A0000-0x00000000008A1000-memory.dmp
memory/2076-12-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-23-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-47-0x00000000008A0000-0x00000000008A1000-memory.dmp
memory/4820-46-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-68-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-87-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-108-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-131-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-152-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-171-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-190-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-215-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-236-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-255-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-274-0x0000000000400000-0x00000000006CC000-memory.dmp
memory/4820-299-0x0000000000400000-0x00000000006CC000-memory.dmp