73509194fbb3ff4cd6113e17668c6f9ad5a8ec1a12d3fc24e024924e5d87aa58

Reason

Machine shutdown

General

Target

sample.exe
Size

5.1MB
MD5

3a92b81cf885e960e1449ef9afaa0534
SHA1

4a44220eef6874036c0413be132bb5a21d71d2ff
SHA256

16015c33b2b39392a2776d1c0e5917d0051483ab0e473679447798e0fc5e65b0
SHA512

97d32f84b56e872109ca21b7a1b183c33a3f721878962819247b74bbef400bde9638dfc006905f2cfc2c8903d0974f9783c7cc8693e189a46af00bcecf8bb7e1

Score

8^/10

bootkit ransomware spyware

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

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

Modifies extensions of user files 12 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

sample.exe

description	ioc	process
File created	C:\Users\Admin\Pictures\BlockLock.png.locked	sample.exe
File created	C:\Users\Admin\Pictures\ConnectStart.tiff	sample.exe
File created	C:\Users\Admin\Pictures\ExportConvertTo.tiff.locked	sample.exe
File created	C:\Users\Admin\Pictures\FindMove.tiff	sample.exe
File created	C:\Users\Admin\Pictures\RepairConfirm.png.locked	sample.exe
File created	C:\Users\Admin\Pictures\StepRead.raw.locked	sample.exe
File created	C:\Users\Admin\Pictures\ConnectStart.tiff.locked	sample.exe
File created	C:\Users\Admin\Pictures\ExportConvertTo.tiff	sample.exe
File created	C:\Users\Admin\Pictures\FindMove.tiff.locked	sample.exe
File created	C:\Users\Admin\Pictures\HideExpand.tif.locked	sample.exe
File created	C:\Users\Admin\Pictures\ImportConvertTo.tiff.locked	sample.exe
File created	C:\Users\Admin\Pictures\ImportConvertTo.tiff	sample.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	process
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
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 (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
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\Explorer\Accent\AccentColorMenu = "4292311040"	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\CurrentVersion\Themes\History\AutoColor = "0"	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\ColorizationColorBalance = "89"	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

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

wlrmdr.exe

pid process

1604 wlrmdr.exe
1604 wlrmdr.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

shutdown.exe

description pid process

Token: SeShutdownPrivilege 1408 shutdown.exe
Token: SeRemoteShutdownPrivilege 1408 shutdown.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

wlrmdr.exeLogonUI.exe

pid process

1604 wlrmdr.exe
2068 LogonUI.exe

pid	process
1604	wlrmdr.exe
1604	wlrmdr.exe

description	pid	process
Token: SeShutdownPrivilege	1408	shutdown.exe
Token: SeRemoteShutdownPrivilege	1408	shutdown.exe

pid	process
1604	wlrmdr.exe
2068	LogonUI.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

sample.execmd.exe

description	pid	process	target process
PID 4760 wrote to memory of 1360	4760	sample.exe	cmd.exe
PID 4760 wrote to memory of 1360	4760	sample.exe	cmd.exe
PID 4760 wrote to memory of 1360	4760	sample.exe	cmd.exe
PID 1360 wrote to memory of 1408	1360	cmd.exe	shutdown.exe
PID 1360 wrote to memory of 1408	1360	cmd.exe	shutdown.exe
PID 1360 wrote to memory of 1408	1360	cmd.exe	shutdown.exe

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Modifies extensions of user files
- Suspicious use of WriteProcessMemory
PID:4760

C:\Windows\SysWOW64\cmd.exe
cmd.exe /c "shutdown /r /f /t 1"
2⤵
- Suspicious use of WriteProcessMemory
PID:1360

C:\Windows\SysWOW64\shutdown.exe
shutdown /r /f /t 1
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:1408

C:\Windows\system32\wlrmdr.exe
-s -1 -f 2 -t You're about to be signed out -m Windows will shut down in less than a minute. -a 3
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:1604

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ad1055 /state1:0x41c64e6d
1⤵
- Modifies WinLogon to allow AutoLogon
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:2068

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

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

memory/1360-7-0x0000000000000000-mapping.dmp

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memory/1408-8-0x0000000000000000-mapping.dmp

Download
memory/4760-2-0x0000000000400000-0x0000000000938000-memory.dmp

Filesize
5.2MB

Download

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads