d5395f121277d2b38f4173c7df0a20a3de99edfcfe2aa697080cc81170eb76ab

Resubmissions

17/07/2025, 17:08

250717-vnsn1a1xex5

17/07/2025, 16:59

250717-vhxqrs1xc110

15/06/2025, 15:43

250615-s55zjssyhz

15/06/2025, 12:42

250615-pxjjsstqw610

Analysis

max time kernel
95s
max time network
102s
platform
windows11-21h2_x64
resource
win11-20250610-en
resource tags

arch:x64arch:x86image:win11-20250610-enlocale:en-usos:windows11-21h2-x64system
submitted
15/06/2025, 12:42

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
My-Skidded-malwares-main/Cirno.exe
Size 829KB
Sample250615-pxjjsstqw6
SHA256 1396f43eb7dfce2024c4a0b5c91a80c1d94a98e52eb7c6f2f533f44e9acc6b70
MD5 06f1165fd374b39e2a7102baa33b5197
SHA1 56415c2892de1a928fbbfbcdd533121b108e1f50
SHA512 455434788dff51a6b9fc9bf0040740680ea42870d11c83d1ed8b74bc1d2bc7aa2009276f79d8a841a3544f6c0c38954ef026fca7041abaf39d62eaf54e4bdfc8
SSDEEP 12288:JDbpr2trUqUeBhfUHzXC+cHJ8XeSb++MnaTXv0d28i10kaj/29T:JDdsrsG5UHulCXR+xaTXh1qj/
MD5 SHA1 SHA512 SSDEEP

Score

6^/10

bootkit discovery persistence

Malware Config

Signatures

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3706614508-2363726640-185459670-1000\Software\Microsoft\Windows\CurrentVersion\Run\CustomMBR = "C:\\Users\\Admin\\AppData\\Local\\Temp\\My-Skidded-malwares-main\\Cirno.exe -BypassWarning"	Cirno.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3706614508-2363726640-185459670-1000\Software\Microsoft\Windows\CurrentVersion\Run\CustomMBR = "C:\\Users\\Admin\\AppData\\Local\\Temp\\My-Skidded-malwares-main\\Cirno.exe -BypassWarning"	Cirno.exe

Writes to the Master Boot Record (MBR) 1 TTPs 2 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	Cirno.exe
File opened for modification	\??\PhysicalDrive0	Cirno.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	Cirno.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Cirno.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1540	schtasks.exe
2636	schtasks.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3844	Cirno.exe
3592	Cirno.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3844 wrote to memory of 2636	3844	Cirno.exe	78
PID 3844 wrote to memory of 2636	3844	Cirno.exe	78
PID 3844 wrote to memory of 2636	3844	Cirno.exe	78
PID 4580 wrote to memory of 3592	4580	cmd.exe	82
PID 4580 wrote to memory of 3592	4580	cmd.exe	82
PID 4580 wrote to memory of 3592	4580	cmd.exe	82
PID 3592 wrote to memory of 1540	3592	Cirno.exe	83
PID 3592 wrote to memory of 1540	3592	Cirno.exe	83
PID 3592 wrote to memory of 1540	3592	Cirno.exe	83

C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\Cirno.exe
"C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\Cirno.exe"
1⤵
- Adds Run key to start application
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3844
- 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\Cirno.exe -BypassWarning"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2636

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\Cirno.exe -BypassWarning
1⤵
- Suspicious use of WriteProcessMemory
PID:4580
- C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\Cirno.exe
  C:\Users\Admin\AppData\Local\Temp\My-Skidded-malwares-main\Cirno.exe -BypassWarning
  2⤵
  - Adds Run key to start application
  - Writes to the Master Boot Record (MBR)
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3592
- - 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\Cirno.exe -BypassWarning"
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1540