d5395f121277d2b38f4173c7df0a20a3de99edfcfe2aa697080cc81170eb76ab

Resubmissions

09/03/2025, 01:58

250309-cdv29swybs 10

08/03/2025, 06:55

250308-hp35xatjt9 10

08/03/2025, 04:53

250308-fh1ebssky5 10

Analysis

max time kernel
7s
platform
windows11-21h2_x64
resource
win11-20250217-en
resource tags

arch:x64arch:x86image:win11-20250217-enlocale:en-usos:windows11-21h2-x64system
submitted
08/03/2025, 06:55

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Reason

Machine shutdown

Report Analysis Logs

General

Target

My-Skidded-malwares-main/NazrinMBR.exe
Size

585KB
MD5

edd65f78ef00c65c4c1aaf6b0008bb6e
SHA1

15c89a818f1f77e37c5834ef0c1206ae503b88fe
SHA256

39f10bd32de22b4495d01191017485261a937ed1b60373720ae831feed973031
SHA512

0cf6ad704170fcd7c3b62ad2a7015e9f5ce520fe26533a83729b4bc9554d2b2bc7038afb84fe1207379d9af983f9bee263fa1b78fcea46ddac77785fa7d173dd
SSDEEP

12288:1Dbpr2trUqUeBhfUHzXC+cHJ8XeSb++6naT5v0:1DdsrsG5UHulCXR+PaT5

Score

6^/10

bootkit discovery persistence

Malware Config

Signatures

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1408376509-1621642251-2666462513-1000\Software\Microsoft\Windows\CurrentVersion\Run\CustomMBR = "C:\\Users\\Admin\\AppData\\Local\\Temp\\My-Skidded-malwares-main\\NazrinMBR.exe -BypassWarning"	NazrinMBR.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	NazrinMBR.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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	NazrinMBR.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1456	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4864	NazrinMBR.exe
4864	NazrinMBR.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4864	NazrinMBR.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4864	NazrinMBR.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4864 wrote to memory of 1456	4864	NazrinMBR.exe	78
PID 4864 wrote to memory of 1456	4864	NazrinMBR.exe	78
PID 4864 wrote to memory of 1456	4864	NazrinMBR.exe	78

C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\NazrinMBR.exe
"C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\NazrinMBR.exe"
1⤵
- Adds Run key to start application
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4864
- C:\Windows\SysWOW64\schtasks.exe
  schtasks.exe /Create /TN CustomMBR /ru SYSTEM /SC ONSTART /TR "C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\NazrinMBR.exe -BypassWarning"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1456