b59d4d38c6c98590709bcb7e4299a4e10306b29d46a56c5e8a6bb274bd4bef31

Analysis

max time kernel
4s
max time network
7s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28-02-2024 22:32

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Reason

Machine shutdown

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General

Target

Windows/Ransomware/Monster Ransomware (second new version)/tunamor.exe
Size

71KB
MD5

e9fdc21bd273444925a4512166188e5b
SHA1

e398138686eedcd8ef9de5342025f7118e120cdf
SHA256

78972cdde1a038f249b481ea2c4b172cc258aa294440333e9c46dcb3fbed5815
SHA512

64989534f56fcd70f3ff08bb47a331d5624fc1e3b387420a885d6f32a537e05182de8c5890612cde03fdd312ad101955674d7455c84b900bf7eed97b402a2b08
SSDEEP

768:Uv3mq1oJQpwvZlXhVkcDsaoi9P9TJKvaoStYARRQwfwiIySf4BtIl82+hE8x:YmqMQoXhVN4aooJhDCSeyxel82WNx

Score

6^/10

bootkit persistence

Malware Config

Signatures

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	tunamor.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "125"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeShutdownPrivilege	2132	shutdown.exe
Token: SeRemoteShutdownPrivilege	2132	shutdown.exe
Token: SeShutdownPrivilege	2812	shutdown.exe
Token: SeRemoteShutdownPrivilege	2812	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1336	LogonUI.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1432 wrote to memory of 2132	1432	tunamor.exe	69
PID 1432 wrote to memory of 2132	1432	tunamor.exe	69
PID 1432 wrote to memory of 2132	1432	tunamor.exe	69
PID 1432 wrote to memory of 2812	1432	tunamor.exe	68
PID 1432 wrote to memory of 2812	1432	tunamor.exe	68
PID 1432 wrote to memory of 2812	1432	tunamor.exe	68

C:\Users\Admin\AppData\Local\Temp\Windows\Ransomware\Monster Ransomware (second new version)\tunamor.exe
"C:\Users\Admin\AppData\Local\Temp\Windows\Ransomware\Monster Ransomware (second new version)\tunamor.exe"
1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious use of WriteProcessMemory
PID:1432
- C:\Windows\SysWOW64\shutdown.exe
  C:\Windows\System32\shutdown.exe -r -f -t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2812
- C:\Windows\SysWOW64\shutdown.exe
  shutdown.exe -r -f -t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2132

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa39a9055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:1336

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

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Downloads

memory/1432-0-0x0000000000400000-0x000000000043F000-memory.dmp

Filesize
252KB

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Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads