Analysis Overview
SHA256
8e25f551c62c72c1f47877affafb617992282b2e115c8c8977918fc6493aece3
Threat Level: Known bad
The file Chernobyl.exe was found to be: Known bad.
Malicious Activity Summary
UAC bypass
Modifies WinLogon for persistence
Disables RegEdit via registry modification
Possible privilege escalation attempt
Disables Task Manager via registry modification
Modifies file permissions
Modifies WinLogon
Checks whether UAC is enabled
Drops file in System32 directory
Drops file in Windows directory
Unsigned PE
Enumerates physical storage devices
System policy modification
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Modifies registry class
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-03-02 20:13
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-03-02 20:13
Reported
2024-03-02 20:14
Platform
win7-20240221-en
Max time kernel
34s
Max time network
19s
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\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\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 |
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\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\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 |
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 |
| 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 WriteProcessMemory
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\Chernobyl.exe | N/A |
| 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 |
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\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
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/2192-0-0x0000000000050000-0x00000000000AC000-memory.dmp
memory/2192-1-0x0000000074C10000-0x00000000752FE000-memory.dmp
C:\Users\Admin\Desktop\Æń63≈ø√¶4¥σœÆ■¬ñ█½ÿ√♦♣╚ó«☼¾♦6♦♥▬ž♪¾╠™ε™φφÆσ¼7õφΣö■♫╧í▼φ6č○ñπ♦Ÿ╚5ßš£σóñ♫¾šσ1ö×ñ≈♪õΣ◄¶åΣ☼↕↕♥ñ♂♫æÿ▬3◄æ
| MD5 | 9e1e5883c74742a497cf5c272ccd2321 |
| SHA1 | 2cf33e34d08b8e17743a60352baffef4b6f02dee |
| SHA256 | ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a |
| SHA512 | f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b |
memory/2192-306-0x0000000005370000-0x00000000053B0000-memory.dmp
memory/2192-307-0x0000000005370000-0x00000000053B0000-memory.dmp
memory/2192-308-0x0000000074C10000-0x00000000752FE000-memory.dmp
memory/2192-309-0x0000000005370000-0x00000000053B0000-memory.dmp