Malware Analysis Report

2024-10-18 22:07

Sample ID 240611-p1fbjsxcqh
Target 2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba
SHA256 e9843f3485755bf3f2bb45c8252dd5df87f7c943840c65a05143442d04f9672c
Tags
bootkit persistence
score
6/10

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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
6/10

SHA256

e9843f3485755bf3f2bb45c8252dd5df87f7c943840c65a05143442d04f9672c

Threat Level: Shows suspicious behavior

The file 2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba was found to be: Shows suspicious behavior.

Malicious Activity Summary

bootkit persistence

Adds Run key to start application

Writes to the Master Boot Record (MBR)

Drops file in Program Files directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Modifies data under HKEY_USERS

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-11 12:47

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-11 12:47

Reported

2024-06-11 12:47

Platform

win7-20240508-en

Max time kernel

6s

Max time network

7s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe"

Signatures

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\System = "C:\\Program Files\\System.dll" C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\physicaldrive0 C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\System.dll C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A
File opened for modification C:\Program Files\System.dll C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A
File created C:\Program Files\360.dll C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeShutdownPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe"

C:\Windows\system32\LogonUI.exe

"LogonUI.exe" /flags:0x0

C:\Windows\system32\LogonUI.exe

"LogonUI.exe" /flags:0x1

Network

N/A

Files

memory/1252-2-0x0000000002F10000-0x0000000002F11000-memory.dmp

memory/2312-3-0x0000000002AB0000-0x0000000002AB1000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-11 12:47

Reported

2024-06-11 12:47

Platform

win10v2004-20240508-en

Max time kernel

2s

Max time network

3s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe"

Signatures

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\System = "C:\\Program Files\\System.dll" C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\physicaldrive0 C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\360.dll C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A
File created C:\Program Files\System.dll C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A
File opened for modification C:\Program Files\System.dll C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Modifies data under HKEY_USERS

Description Indicator Process Target
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "217" C:\Windows\system32\LogonUI.exe N/A
Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00 C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" C:\Windows\system32\LogonUI.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeShutdownPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_28c80739400645b392c9ec6ac2c3fcd4_mbrlock_xiaoba.exe"

C:\Windows\system32\LogonUI.exe

"LogonUI.exe" /flags:0x4 /state0:0xa399a855 /state1:0x41c64e6d

Network

Files

N/A