62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170

Modify Existing Service

T1031

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wuauserv\Start = "4"	smss.exe

UAC bypass 3 TTPs 2 IoCs

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	smss.exe

Windows security bypass 2 TTPs 2 IoCs

Disabling Security Tools

T1089

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UACDisableNotify = "0"	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UACDisableNotify = "0"	smss.exe

Drops file in Drivers directory 2 IoCs

description	ioc	Process
File created	C:\WINDOWS\system32\drivers\etc\hosts	smss.exe
File opened for modification	C:\WINDOWS\system32\drivers\etc\hosts	smss.exe

Executes dropped EXE 1 IoCs

pid	Process
1680	smss.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Sr\ImagePath = "\\SystemRoot\\system32\\DRIVERS\\sr.sys"	smss.exe

Windows security modification 2 TTPs 2 IoCs

Disabling Security Tools

T1089

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UACDisableNotify = "0"	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UACDisableNotify = "0"	smss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	smss.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "C:\\WINDOW\\System32\\smss.exe"	smss.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	smss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1680	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeBackupPrivilege	2420	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
Token: SeBackupPrivilege	1680	smss.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2420	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
1680	smss.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 1680	2420	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe	83
PID 2420 wrote to memory of 1680	2420	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe	83
PID 2420 wrote to memory of 1680	2420	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe	83

System policy modification 1 TTPs 2 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	smss.exe

C:\Users\Admin\AppData\Local\Temp\62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe
"C:\Users\Admin\AppData\Local\Temp\62239cd9bcc61bf8140d56401ee7ea2432958b1979a5219e05ae88c07936f170.exe"
1⤵
- UAC bypass
- Windows security bypass
- Windows security modification
- Checks whether UAC is enabled
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2420
- C:\WINDOW\System32\smss.exe
  C:\WINDOW\System32\smss.exe
  2⤵
  - Modifies security service
  - UAC bypass
  - Windows security bypass
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Sets service image path in registry
  - Windows security modification
  - Adds Run key to start application
  - Checks whether UAC is enabled
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - System policy modification
  PID:1680

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

2

T1060

Privilege Escalation

Bypass User Account Control

T1088

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery