Analysis Overview
SHA256
2b6266f14d2ed46e921168fd2b4a5510f40c69cd591800d17ae8ca31fcde28c6
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
Disables Task Manager via registry modification
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
Modifies registry class
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-03-02 22:22
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-03-02 22:22
Reported
2024-03-02 22:53
Platform
win11-20240221-en
Max time kernel
1484s
Max time network
1498s
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-1-5-21-160263616-143223877-1356318919-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
Disables Task Manager via registry modification
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 opened for modification | C:\Windows\cluttscape.exe | C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe | N/A |
| File created | 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 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\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\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\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\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\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\SysWOW64\rundll32.exe
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 55.36.223.20.in-addr.arpa | 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 |
Files
memory/3904-0-0x0000000074D10000-0x00000000754C1000-memory.dmp
memory/3904-1-0x0000000000420000-0x000000000047C000-memory.dmp
memory/3904-2-0x0000000004EB0000-0x0000000004F42000-memory.dmp
memory/3904-3-0x0000000005500000-0x0000000005AA6000-memory.dmp
memory/3904-4-0x0000000004E80000-0x0000000004E90000-memory.dmp
C:\Users\Admin\Desktop\äœ∞ÿ♪¶3∩é™▲±╤▼╩╠◙π¾∞œ♦▐×╩čεšπ¤4█µŸ▬±¼æÇæ±ß♀é¶Â▬∞—ÿ╩◘↑♥¼♦¢♥▀æÿ♦♪ń3š¾Σ☺∞√▲ž√■₧☺£Æ¬♥▐ě¤éä╥¬—φæ↑▌▐5öÇ╤õø
| MD5 | 9e1e5883c74742a497cf5c272ccd2321 |
| SHA1 | 2cf33e34d08b8e17743a60352baffef4b6f02dee |
| SHA256 | ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a |
| SHA512 | f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b |
memory/3904-309-0x00000000061C0000-0x00000000061CA000-memory.dmp
memory/3904-310-0x0000000074D10000-0x00000000754C1000-memory.dmp
memory/3904-311-0x0000000004E80000-0x0000000004E90000-memory.dmp