f1bbcc5c678d174d858ae089f4494e3ea8bcfc418098d61804a15e437f08aff7

Target

[email protected]
Size

136KB
MD5

70108103a53123201ceb2e921fcfe83c
SHA1

c71799a6a6d09ee758b04cdf90a4ab76fbd2a7e3
SHA256

9c3f8df80193c085912c9950c58051ae77c321975784cc069ceacd4f57d5861d
SHA512

996701c65eee7f781c2d22dce63f4a95900f36b97a99dcf833045bce239a08b3c2f6326b3a808431cdab92d59161dd80763e44126578e160d79b7095175d276b

Score

8^/10

bootkit persistence ransomware

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4916	sys3.exe

Modifies WinLogon to allow AutoLogon 2 TTPs 1 IoCs

Enables rebooting of the machine without requiring login credentials.

ransomware bootkit

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked	LogonUI.exe

Deletes itself 1 IoCs

pid	Process
4916	sys3.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

T1067

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	[email protected]
File opened for modification	\??\PHYSICALDRIVE0	sys3.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
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\AccentColorMenu = "4292311040"	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\ColorizationAfterglowBalance = "10"	LogonUI.exe
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\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	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\ColorizationGlassAttribute = "1"	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\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	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\EnableWindowColorization = "1"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeShutdownPrivilege	4916	sys3.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4976	LogonUI.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4648 wrote to memory of 4916	4648	[email protected]	72
PID 4648 wrote to memory of 4916	4648	[email protected]	72
PID 4648 wrote to memory of 4916	4648	[email protected]	72

C:\Users\Admin\AppData\Local\Temp\[email protected]
"C:\Users\Admin\AppData\Local\Temp\[email protected]"
1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious use of WriteProcessMemory
PID:4648
- C:\Users\Admin\AppData\Local\Temp\sys3.exe
  C:\Users\Admin\AppData\Local\Temp\\sys3.exe
  2⤵
  - Executes dropped EXE
  - Deletes itself
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of AdjustPrivilegeToken
  PID:4916

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ac9855 /state1:0x41c64e6d
1⤵
- Modifies WinLogon to allow AutoLogon
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4976

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Bootkit

T1067

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Resubmissions

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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