2a17e3086c909b6f21fc681ded7cad0f85c308118691899b181948cb4a11d81c

Reason

Machine shutdown

General

Target

Wolfteam/api_ms_win_core_timezone_l1_1_0.dll
Size

18KB
MD5

fbfd4e793c857621f39f072eda5090df
SHA1

a58fc3833c54916b1f5bdf7a795782a3fd9350d2
SHA256

a64bc428270acd0abe920239d79930dd0bff1e800adf4d746e55d86d59edac25
SHA512

851e0f35cf4f2cd4b35c106e0cd1911b26116aa96592ce9cf788355ed17f72cf5e1c0833435bf1528300b8440e049b652391c13202721cdafa4b01c47461ec3b

Score

8^/10

bootkit ransomware

Malware Config

Signatures

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

Processes:

LogonUI.exe

description ioc process

Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked LogonUI.exe
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

5052 4672 WerFault.exe rundll32.exe
636 4672 WerFault.exe rundll32.exe

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

pid	pid_target	process	target process
5052	4672	WerFault.exe	rundll32.exe
636	4672	WerFault.exe	rundll32.exe

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	process
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\EnableWindowColorization = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	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\ColorizationColorBalance = "89"	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\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\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

WerFault.exe

pid	process
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe
5052	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

WerFault.exe

description pid process

Token: SeRestorePrivilege 5052 WerFault.exe
Token: SeBackupPrivilege 5052 WerFault.exe
Token: SeDebugPrivilege 5052 WerFault.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

LogonUI.exe

pid process

4356 LogonUI.exe
4356 LogonUI.exe

description	pid	process
Token: SeRestorePrivilege	5052	WerFault.exe
Token: SeBackupPrivilege	5052	WerFault.exe
Token: SeDebugPrivilege	5052	WerFault.exe

pid	process
4356	LogonUI.exe
4356	LogonUI.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 4652 wrote to memory of 4672	4652	rundll32.exe	rundll32.exe
PID 4652 wrote to memory of 4672	4652	rundll32.exe	rundll32.exe
PID 4652 wrote to memory of 4672	4652	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\Wolfteam\api_ms_win_core_timezone_l1_1_0.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4652

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\Wolfteam\api_ms_win_core_timezone_l1_1_0.dll,#1
2⤵
PID:4672

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4672 -s 616
3⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5052

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4672 -s 616
3⤵
- Program crash
PID:636

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ad2855 /state1:0x41c64e6d
1⤵
- Modifies WinLogon to allow AutoLogon
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4356

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/4672-2-0x0000000000000000-mapping.dmp

Download
memory/5052-3-0x0000000004240000-0x0000000004241000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads