a849e0c7741599b0fd60392d0eeb5d83e215f4f90795af60bf1ad20bd530cb9c

Analysis

user interaction
yes
max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
04/08/2026, 02:12

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General

Target
loader.exe
Size 18.0MB
Sample260804-cnbflsen3v
SHA256 a849e0c7741599b0fd60392d0eeb5d83e215f4f90795af60bf1ad20bd530cb9c
MD5 fc4c13973d35400640794fef290476ab
SHA1 1f363819b1644942838c972be35ed95e42defee7
SHA512 acbd0e53b324f8d5ffc086b63eaf8535bd60590dbeab9ba26c910fbcd3d6e5d977465e9e3a65501d030be0850853e1cd4777b5d707bd191fe2726b2d03599d6a
SSDEEP 393216:eIDKl6Ffh82f3Ug9qd5MDWO4Icq+zj641v6Yw:ee3Zqd5My9lqnSw
TLSH
T1B71712C125E982FDC362C63DD24617EAE9C93C858DBB652ABFCA64013471C45C8EBD39
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

bootkit execution persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
1244	loader.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3372	powershell.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	loader.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4920	loader.exe

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
4300	cmd.exe

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Cryptography\TPM\Telemetry	loader.exe
Set value (int)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Cryptography\TPM\Telemetry\TraceTimeLast = "134302831875750977"	loader.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3372	powershell.exe
3372	powershell.exe

Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 1 IoCs

pid	Process
4920	loader.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
4920	loader.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeSystemtimePrivilege	4920	loader.exe
Token: SeDebugPrivilege	3372	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4920 wrote to memory of 1244	4920	loader.exe	85
PID 1244 wrote to memory of 4300	1244	loader.exe	86
PID 4300 wrote to memory of 3372	4300	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4920
- C:\Users\Admin\AppData\Local\Temp\loader.exe
  "C:\Users\Admin\AppData\Local\Temp\loader.exe"
  2⤵
  - Executes dropped EXE
  - Writes to the Master Boot Record (MBR)
  - Modifies data under HKEY_USERS
  - Suspicious use of WriteProcessMemory
  PID:1244
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c powershell.exe -NoProfile -ExecutionPolicy Bypass -Command ^"^& { $encoded = 'QXBwIGluaXRpYWxpemF0aW9uIGVycm9yIDB4MTAz'; $text = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($encoded)); $text = $text.Replace('\n', [Environment]::NewLine); Add-Type -AssemblyName PresentationFramework; [System.Windows.MessageBox]::Show($text, 'sync.top', 'OK', 'Error', 'None', 'DefaultDesktopOnly') }^"
    3⤵
    - Executes a command shell one-liner
    - Suspicious use of WriteProcessMemory
    PID:4300
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "& { $encoded = 'QXBwIGluaXRpYWxpemF0aW9uIGVycm9yIDB4MTAz'; $text = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($encoded)); $text = $text.Replace('\n', [Environment]::NewLine); Add-Type -AssemblyName PresentationFramework; [System.Windows.MessageBox]::Show($text, 'sync.top', 'OK', 'Error', 'None', 'DefaultDesktopOnly') }"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3372

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Windows Command Shell

T1059.003

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

__PSScriptPolicyTest_jrtud4bv.yof.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_jrtud4bv.yof.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

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loader.exe

Path C:\Users\Admin\AppData\Local\Temp\loader.exe
Size 18.0MB
SHA256 9ce838a2ec9cdf6ca98b67f13a9b2c4a72f9b40c917e125c52d7583ecdec15f9
MD5 1f10b74e24b692af155e0b2a2d05aad2
SHA1 1c024413399c8ff8ad2a3201dbf045e9540d5fa7
SHA512 4b0f7743ca07684d5009c5d6a2b4c46e57dc6ee3fa68ccac758a6bc0659272304c929577c1fe0cdf1c92f3fbf1b6b75e4747afd6d655be6242f7556a2999e3d5
SSDEEP 393216:eIDKl6Ffh82f3Ug9qd5MDWO4Icq+zj641v6Ywx:ee3Zqd5My9lqnSwx
TLSH
T1A01712C125E982FDC362C63DD24617EAE9C93C858DBB652ABFCA64013471C45C8EBD39
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1244-8-0x00007FF653760000-0x00007FF65594B000-memory.dmp

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memory/1244-25-0x00007FF653760000-0x00007FF65594B000-memory.dmp

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memory/3372-24-0x0000024E75320000-0x0000024E75342000-memory.dmp

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memory/4920-0-0x00007FF61F360000-0x00007FF62154B000-memory.dmp

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memory/4920-7-0x00007FF61F360000-0x00007FF62154B000-memory.dmp

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