2342b3d3120400baea76a500a710fc239ea8d1c587459c4c20bc070e44281c27

Analysis

max time kernel
4s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
01/10/2026, 14:56

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Reason

Machine shutdown

General

Target
Chernobyl.exe
Size 1.2MB
Sample261001-sbdcfaee45
SHA256 2342b3d3120400baea76a500a710fc239ea8d1c587459c4c20bc070e44281c27
MD5 07b111536b5f2e251b3db0cd83b2d1ee
SHA1 2a1b9c115a5d703a8dbd75796544bc88cf0ae29e
SHA512 b99b35fb10432fa70c233bf6acda5f06047332e5aa631446221284c6659bd9a1ac697c4123cbd4ddce603a4d8810ee4940574bcdef9d59189edb4433c18741f1
SSDEEP 24576:EzYx3PgYWwocek/r2+AAYNh3tBULAkS7LeB:EkoA/qhlL3rmzS7
TLSH
T17C55A522A687D9A3C41E1270DDC7D32977B2E0F46B368B87BA4C87AF7D213A11CC5546
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

bootkit discovery execution persistence privilege_escalation

Malware Config

Signatures

Event Triggered Execution: Component Object Model Hijacking 1 TTPs
Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.
persistence privilege_escalation

Component Object Model Hijacking
T1546.015

Executes dropped EXE 1 IoCs

pid	Process
3376	nasm.exe

Modifies system executable filetype association 2 TTPs 34 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\edit\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\edit	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runasuser	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\runasuser	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\DefaultIcon	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\DefaultIcon	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shellex\ContextMenuHandlers	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runas	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shellex\ContextMenuHandlers\Compatibility	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shellex\ContextMenuHandlers\PintoStartScreen	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shellex\ContextMenuHandlers	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\print\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\print	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\runas\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\DefaultIcon	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shellex\DropHandler	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shellex	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shellex\DropHandler	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\runas	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\runasuser\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shellex\ContextMenuHandlers\Compatibility	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shellex\DropHandler	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runas\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\runasuser\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\batfile\shell\open\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\comfile\shell\open\command	reg.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	Chernobyl.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1724	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nasm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Chernobyl.exe

Modifies registry class 64 IoCs

description	ioc	Process
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\AcroExch.XDPDoc\shell\Open\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{0006F023-0000-0000-C000-000000000046}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D6FCA954-F7AE-4EAC-8783-85F5E4ABD840}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\CompressedFolder\Shell\find\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Excel.SheetBinaryMacroEnabled.12\shell\ViewProtected	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Forms.TextBox.1\CLSID	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.gz	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.mp2v\ShellEx\{BB2E617C-0920-11D1-9A0B-00C04FC2D6C1}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{3050F37F-98B5-11CF-BB82-00AA00BDCE0B}\InprocServer32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{AA00FB1F-4EC7-4b09-BDC1-E5D88D291440}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{f414c260-6ac0-11cf-b6d1-00aa00bbbb58}\Implemented Categories	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.crt	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\AudioEngine\AudioProcessingObjects\{13AB3EBD-137E-4903-9D89-60BE8277FD17}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00020833-0000-0000-C000-000000000046}\InprocHandler32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{05589F80-C356-11CE-BF01-00AA0055595A}\InprocServer32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{17CCA71B-ECD7-11D0-B908-00A0C9223196}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Installer\Products\00006109C80000000100000000F01FEC\SourceList	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Installer\Products\5040806F8AF9AAC49928419ED5A1D3CA\SourceList	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.orf\ShellEx	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.ppsm\ShellEx\PropertyHandler	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\AppX3cx04417ybaf9kz7fem54fc937697n6k	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00020820-0000-0000-C000-000000000046}\Verb\1	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{083863F1-70DE-11D0-BD40-00A0C911CE86}\Instance\{4EB31670-9FC6-11CF-AF6E-00AA00B67A42}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.dochtml	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.vstx	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.xlsb	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shell\find\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\ExcelChart\CLSID	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\IE.AssocFile.SVG\shell\open\command	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.uvu\ShellEx\{BB2E617C-0920-11D1-9A0B-00C04FC2D6C1}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.wdp\OpenWithProgids	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Adobe.Reader.HTMLPreview.1\CurVer	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Applications\mspaint.exe	reg.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2304238888-3968896904-642854331-1000_Classes\WOW6432Node\CLSID\{389510b7-9e58-40d7-98bf-60b911cb0ea9}\TypeLib	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{523A581F-EC58-40CE-99D3-36BF7897F3EC}\InProcServer32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{EABCECDB-CC1C-4A6F-B4E3-7F888A5ADFC8}\AuxUserType\3	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F8CF7A98-2C45-4c8d-9151-2D716989DDAB}\ToolboxBitmap32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1B261B22-AC6A-4E68-A870-AB5080E8687B}\DataFormats\GetSet\0	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{492E1C30-A1A2-4695-87C8-7A8CAD6F936F}\ProgID	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C282417B-2662-44B8-8A94-3BFF61C50900}\DefaultExtension	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F8CF7A98-2C45-4c8d-9151-2D716989DDAB}\EnableFullPage\.vsx	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.cdx	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{EA7BAE70-FB3B-11CD-A903-00AA00510EA3}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{F0B4F6AD-5E09-4CB1-B763-EC390CBDE51D}\TypeLib	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.dctx	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.xdp\OpenWithProgids	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\AppUserModelId\Windows.SystemToast.Ethernet	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00020907-0000-0000-C000-000000000046}\AuxUserType	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1227B818-7298-3D68-AC55-DDDA56EE56E1}\InprocServer32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{22c6c651-f6ea-46be-bc83-54e83314c67f}\InProcServer32	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\inffile	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.trg\PersistentHandler	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.vdx\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\.vsdm\ShellEx\PropertyHandler	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{18A06B6B-2F3F-4E2B-A611-52BE631B2D22}\AuxUserType\2	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{82B02373-B5BC-11CF-810F-00A0C9030074}\InprocServer32\11.0.0.0	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{E05592E4-C0B5-11D0-A439-00A0C9223196}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Excel.OpenDocumentSpreadsheet.12\shell\ViewProtected\ddeexec	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\AccClientDocMgr.AccClientDocMgr\CurVer	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\AcroExch.XDPDoc\shell\Print	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\Excel.SheetBinaryMacroEnabled.12\shell\Printto	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\CDO.NNTPFinalConnector\CurVer	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00000535-0000-0010-8000-00AA006D2EA4}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}\InprocServer32	reg.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4384	Chernobyl.exe
Token: SeDebugPrivilege	4384	Chernobyl.exe
Token: 33	4592	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	4592	AUDIODG.EXE

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4384 wrote to memory of 3376	4384	Chernobyl.exe	89
PID 4384 wrote to memory of 1724	4384	Chernobyl.exe	92
PID 1724 wrote to memory of 8	1724	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe
"C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe"
1⤵
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4384
- C:\Users\Admin\AppData\Local\Temp\nasm.exe
  "nasm.exe" -f bin mbr_temp.asm -o mbr_temp.bin
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:3376
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg delete HKCR /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1724
- - C:\Windows\SysWOW64\reg.exe
    reg delete HKCR /f
    3⤵
    - Modifies system executable filetype association
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    PID:8

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x00000000000004FC 0x0000000000000500
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4592

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Persistence

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Component Object Model Hijacking

T1546.015

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Component Object Model Hijacking

T1546.015

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

mbr_temp.asm

Path C:\Users\Admin\AppData\Local\Temp\mbr_temp.asm
Size 1KB
SHA256 9fdfd968643c046a87defa558840a6a523324d8b7d447deb5cd089ab7e456317
MD5 3632f34a0a2e0b39b9adfba26f745b8d
SHA1 199cfd15f8debdf1e77e3e37fcf92f4e0a28f1b6
SHA512 f005ac944ceb38552bacf856bcb4ddb69680f889a9dfd557292e151b01af86495d470a53703fcd19d6dea69d44bc9686635237f23901a9494cdb0f59fbf8cfdd
TLSH
T1F8217B9E6D1247CA45FA161CD4C1EE1FF2AD575F40C52929B71C43378F7A450EBA046C
MD5 SHA1 SHA512 TLSH

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mbr_temp.bin

Path C:\Users\Admin\AppData\Local\Temp\mbr_temp.bin
Size 512B
SHA256 032c085f82cde3370e27119e29392d0bec4df704a6c431e9461f8bf1a32a5a06
MD5 0a8589321be2e6c9a0e9a4e4aa46c0fa
SHA1 a548554896bc34d9c7e25dc024050dd44a2825e1
SHA512 9cfc0daaa474f643af5845d3e4a83323a17325446c6b065f3a9d7287a3ff3f3a588bf72209ba0aa3be412b6bdb2f80b84c43c467d48849db5813ecd92fa82bca
TLSH
T16BF0226AA4CE92C9D44601B0603A48B824083AACEA0AE45040682C0BE3D8760CF0E269
MD5 SHA1 SHA512 TLSH

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nasm.exe

Path C:\Users\Admin\AppData\Local\Temp\nasm.exe
Size 1.2MB
SHA256 a4735165141570d966b577d594c0541c29baed4978078c1c7237b855f8592a87
MD5 2f17bab79b9e5caa79c4f493a18fb06c
SHA1 f3eb8a09529b82fc08e919517e098644ddc01004
SHA512 37c62999e11f3a44c02bad2ad9941213c0264312f228de32466818ec84d745312f941f4adf6e4bf3f49d5d91e8df56dbf39b7966ed8d4b214b484c93635ca154
SSDEEP 24576:2zYx3PgYWwocek/r2+AAYNh3tBULAkS7Le:2koA/qhlL3rmzS7
TLSH
T1A4459422A687D9A3C40E1270DDC7D32977B2E0F46B368B87BA4C97AF7D213A11CC5546
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/3376-11-0x0000000000400000-0x0000000000539000-memory.dmp

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memory/4384-0-0x0000000074A82000-0x0000000074A83000-memory.dmp

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memory/4384-1-0x00000000000F0000-0x0000000000230000-memory.dmp

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memory/4384-5-0x0000000074A70000-0x000000007522C000-memory.dmp

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memory/4384-16-0x00000000066C0000-0x0000000006752000-memory.dmp

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memory/4384-17-0x0000000074A82000-0x0000000074A83000-memory.dmp

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memory/4384-18-0x0000000074A70000-0x000000007522C000-memory.dmp

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Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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