Analysis Overview
SHA256
f4a8b0e01d972c6150db282db7443f91a0bebf85edb5342df44502ed3cc4ce85
Threat Level: Known bad
The file Chernobyl.exe was found to be: Known bad.
Malicious Activity Summary
Modifies WinLogon for persistence
UAC bypass
Disables Task Manager via registry modification
Possible privilege escalation attempt
Disables RegEdit via registry modification
Modifies file permissions
Modifies WinLogon
Checks whether UAC is enabled
Drops file in System32 directory
Drops file in Windows directory
Enumerates physical storage devices
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
System policy modification
Modifies registry class
Suspicious use of FindShellTrayWindow
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-03-02 20:15
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-03-02 20:15
Reported
2024-03-02 20:22
Platform
win7-20240221-en
Max time kernel
96s
Max time network
15s
Command Line
Signatures
Modifies WinLogon for persistence
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, cluttscape.exe" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
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\Chernobyl.exe | N/A |
Disables RegEdit via registry modification
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\USER\S-1-5-21-406356229-2805545415-1236085040-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Disables Task Manager via registry modification
Possible privilege escalation attempt
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
Modifies file permissions
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\icacls.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
Checks whether UAC is enabled
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Modifies WinLogon
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoRestartShell = "0" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\DisableCAD = "1" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\SysWOW64\kill.ico | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\cluttscape.exe | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| File opened for modification | C:\Windows\cluttscape.exe | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Enumerates physical storage devices
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-406356229-2805545415-1236085040-1000_Classes\Local Settings | C:\Windows\system32\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Unknown\DefaultIcon\ = "C:\\Windows\\SysWow64\\kill.ico" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\SysWOW64\takeown.exe | N/A |
| Token: SeShutdownPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Suspicious use of WriteProcessMemory
System policy modification
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\shutdownwithoutlogon = "0" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\UseDefaultTile = "1" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe
"C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\Desktop\╠ï▐♂▀8╤εř╧•žï±♪♣█ל—•µ♪¢®¼╠ß±Â↑¤Ÿ↑☻╧▬ßï4╤▀æ6♥╬—▼Â▲æ▼•►57řžäó♦ÆěŸ²8¥σš¤♪☻2♫9í♫66ö½♠↕ř█▼■5π½♣▄╥²╚ß9▼9½
C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\╠ï▐♂▀8╤εř╧•žï±♪♣█ל—•µ♪¢®¼╠ß±Â↑¤Ÿ↑☻╧▬ßï4╤▀æ6♥╬—▼Â▲æ▼•►57řžäó♦ÆěŸ²8¥σš¤♪☻2♫9í♫66ö½♠↕ř█▼■5π½♣▄╥²╚ß9▼9½
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\smss.exe && icacls C:\Windows\System32\smss.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\smss.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\csrss.exe && icacls C:\Windows\System32\csrss.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\csrss.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\wininit.exe && icacls C:\Windows\System32\wininit.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\wininit.exe
C:\Windows\SysWOW64\icacls.exe
icacls C:\Windows\System32\wininit.exe /grant "Admin:F"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\LogonUI.exe && icacls C:\Windows\System32\LogonUI.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\LogonUI.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\lsass.exe && icacls C:\Windows\System32\lsass.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\lsass.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\services.exe && icacls C:\Windows\System32\services.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\services.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winlogon.exe && icacls C:\Windows\System32\winlogon.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\winlogon.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winload.efi && icacls C:\Windows\System32\winload.efi /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\winload.efi
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winload.exe && icacls C:\Windows\System32\winload.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\winload.exe
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\ntoskrnl.exe && icacls C:\Windows\System32\ntoskrnl.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\ntoskrnl.exe
C:\Windows\SysWOW64\icacls.exe
icacls C:\Windows\System32\ntoskrnl.exe /grant "Admin:F"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\svchost.exe && icacls C:\Windows\System32\svchost.exe /grant "%username%:F" && exit
C:\Windows\SysWOW64\takeown.exe
takeown /f C:\Windows\System32\svchost.exe
C:\Windows\SysWOW64\icacls.exe
icacls C:\Windows\System32\svchost.exe /grant "Admin:F"
Network
Files
memory/1688-1-0x0000000074D50000-0x000000007543E000-memory.dmp
memory/1688-0-0x0000000001360000-0x00000000013BC000-memory.dmp
C:\Users\Admin\Desktop\å╩éš╠¢■8○╔↑œ▄ñφč■∞䟗¬3╧ó▼∞♫šΣ○ö╧↕φ×█♂¬ïÂ♫ńéä1µ☻╬ě♣♫²×√◙▌σ◙♣ß╠▲╚♣☻♦ñΣ•╠╤○☼▀π¶▼▬σ╚æÂ™¢♦ě¤í≈▄♂☼88éΣč▬•
| MD5 | 9e1e5883c74742a497cf5c272ccd2321 |
| SHA1 | 2cf33e34d08b8e17743a60352baffef4b6f02dee |
| SHA256 | ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a |
| SHA512 | f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b |
memory/1688-306-0x0000000000D50000-0x0000000000D90000-memory.dmp
memory/1688-307-0x0000000074D50000-0x000000007543E000-memory.dmp
memory/1688-308-0x0000000000D50000-0x0000000000D90000-memory.dmp
memory/1688-310-0x0000000000D50000-0x0000000000D90000-memory.dmp