fe77628999644775e58cef56fd9ec651ab6e01e5dcba457eabcc213364284258

Reason

Machine shutdown

General

Target
YT3VM.exe
Size 520KB
Sample260730-mn6a4afh87
SHA256 fe77628999644775e58cef56fd9ec651ab6e01e5dcba457eabcc213364284258
MD5 11adfb2127dc0b2e427f6247e0bd3b06
SHA1 5e1a55d1c266fa7932be8dd29ca2ed65bf3e6e4c
SHA512 f753717146cc19a162f621dffb3bd74b80f1aa1e989ed5ea10a6451e4063f2e3a7ce150298eebd810236e8b965dd0971148a14c292454cb38b9cece9fd4f7fde
SSDEEP 12288:nB46AfWZLtV4zjrbn/DvUNtq7rneKTQ0gJWdRU938c:B8fmGzj/Dvf7auK2U938c
TLSH
T177B4D012F6C40451EDAE063B98B38E14C7B0B5DEEE2747CE27DAA86462F334446653F9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery persistence trojan

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, C:\\Windows\\files\\bootup.exe"	YT3VM.exe

UAC bypass 3 TTPs 1 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	YT3VM.exe

Executes dropped EXE 1 IoCs

pid	Process
5724	bootup.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	YT3VM.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	YT3VM.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\files\bootup.exe	YT3VM.exe
File opened for modification	C:\Windows\files\bootup.exe	YT3VM.exe
File created	C:\Windows\files\stage.txt	YT3VM.exe
File opened for modification	C:\Windows\files\stage.txt	bootup.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bootup.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	shutdown.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	YT3VM.exe

Modifies data under HKEY_USERS 15 IoCs

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\AccentColor = "4292311040"	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 = "7"	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\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\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\DWM\ColorizationBlurBalance = "1"	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\DWM	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\ColorizationGlassAttribute = "1"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeShutdownPrivilege	1068	shutdown.exe
Token: SeRemoteShutdownPrivilege	1068	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
768	LogonUI.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4992 wrote to memory of 5724	4992	YT3VM.exe	89
PID 5724 wrote to memory of 1068	5724	bootup.exe	101

System policy modification 1 TTPs 1 IoCs

defense_evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	YT3VM.exe

C:\Users\Admin\AppData\Local\Temp\YT3VM.exe
"C:\Users\Admin\AppData\Local\Temp\YT3VM.exe"
1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Checks whether UAC is enabled
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4992
- C:\Windows\files\bootup.exe
  "C:\Windows\files\bootup.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5724
- - C:\Windows\SysWOW64\shutdown.exe
    "shutdown" /r /f /t 0
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1068

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa38d0055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:768

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

bootup.exe

Path C:\Windows\files\bootup.exe
Size 520KB
SHA256 fe77628999644775e58cef56fd9ec651ab6e01e5dcba457eabcc213364284258
MD5 11adfb2127dc0b2e427f6247e0bd3b06
SHA1 5e1a55d1c266fa7932be8dd29ca2ed65bf3e6e4c
SHA512 f753717146cc19a162f621dffb3bd74b80f1aa1e989ed5ea10a6451e4063f2e3a7ce150298eebd810236e8b965dd0971148a14c292454cb38b9cece9fd4f7fde
SSDEEP 12288:nB46AfWZLtV4zjrbn/DvUNtq7rneKTQ0gJWdRU938c:B8fmGzj/Dvf7auK2U938c
TLSH
T177B4D012F6C40451EDAE063B98B38E14C7B0B5DEEE2747CE27DAA86462F334446653F9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

stage.txt

Path C:\Windows\files\stage.txt
Size 1B
SHA256 4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce
MD5 eccbc87e4b5ce2fe28308fd9f2a7baf3
SHA1 77de68daecd823babbb58edb1c8e14d7106e83bb
SHA512 3bafbf08882a2d10133093a1b8433f50563b93c14acd05b79028eb1d12799027241450980651994501423a66c276ae26c43b739bc65c4e16b10c3af6c202aebb
MD5 SHA1 SHA512

Submit Download

memory/4992-0-0x0000000000070000-0x00000000000F8000-memory.dmp

Download

memory/4992-1-0x0000000004AA0000-0x0000000004B32000-memory.dmp

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memory/4992-2-0x00000000050F0000-0x0000000005694000-memory.dmp

Download

memory/5724-11-0x00000000053E0000-0x00000000053F0000-memory.dmp

Download

memory/5724-12-0x00000000053E0000-0x00000000053F0000-memory.dmp

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Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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