f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7

Processes:

swchost.exeuserinit.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	userinit.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

Processes:

userinit.exeswchost.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	userinit.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	swchost.exe

Modifies Installed Components in the registry 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

userinit.exeswchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	userinit.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432NODE\MICROSOFT\ACTIVE SETUP\INSTALLED COMPONENTS\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	userinit.exe

Executes dropped EXE 4 IoCs

Processes:

userinit.exespoolsw.exeswchost.exespoolsw.exe

pid process

648 userinit.exe
4720 spoolsw.exe
2832 swchost.exe
456 spoolsw.exe

pid	process
648	userinit.exe
4720	spoolsw.exe
2832	swchost.exe
456	spoolsw.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

userinit.exeswchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	swchost.exe

Drops file in System32 directory 1 IoCs

Processes:

userinit.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\system\udsys.exe userinit.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\system\udsys.exe	userinit.exe

Drops file in Windows directory 5 IoCs

Processes:

swchost.exef52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exeuserinit.exespoolsw.exe

description	ioc	process
File opened for modification	\??\c:\windows\swchost.exe	swchost.exe
File opened for modification	\??\c:\windows\userinit.exe	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe
File opened for modification	\??\c:\windows\spoolsw.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	spoolsw.exe
File opened for modification	\??\c:\windows\userinit.exe	userinit.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exeuserinit.exeswchost.exe

pid	process
208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe
208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe
648	userinit.exe
648	userinit.exe
648	userinit.exe
648	userinit.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe
648	userinit.exe
648	userinit.exe
2832	swchost.exe
2832	swchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

swchost.exeuserinit.exe

pid process

2832 swchost.exe
648 userinit.exe

pid	process
2832	swchost.exe
648	userinit.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exeuserinit.exespoolsw.exeswchost.exespoolsw.exe

pid	process
208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe
208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe
648	userinit.exe
648	userinit.exe
4720	spoolsw.exe
4720	spoolsw.exe
2832	swchost.exe
2832	swchost.exe
456	spoolsw.exe
456	spoolsw.exe
648	userinit.exe
648	userinit.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exeuserinit.exespoolsw.exeswchost.exe

description	pid	process	target process
PID 208 wrote to memory of 648	208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe	userinit.exe
PID 208 wrote to memory of 648	208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe	userinit.exe
PID 208 wrote to memory of 648	208	f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe	userinit.exe
PID 648 wrote to memory of 4720	648	userinit.exe	spoolsw.exe
PID 648 wrote to memory of 4720	648	userinit.exe	spoolsw.exe
PID 648 wrote to memory of 4720	648	userinit.exe	spoolsw.exe
PID 4720 wrote to memory of 2832	4720	spoolsw.exe	swchost.exe
PID 4720 wrote to memory of 2832	4720	spoolsw.exe	swchost.exe
PID 4720 wrote to memory of 2832	4720	spoolsw.exe	swchost.exe
PID 2832 wrote to memory of 456	2832	swchost.exe	spoolsw.exe
PID 2832 wrote to memory of 456	2832	swchost.exe	spoolsw.exe
PID 2832 wrote to memory of 456	2832	swchost.exe	spoolsw.exe

C:\Users\Admin\AppData\Local\Temp\f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe
"C:\Users\Admin\AppData\Local\Temp\f52446659cb366fbf03b3a77f640bb9b7ccad5f3b973da705a126c411c50eff7.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:208

\??\c:\windows\userinit.exe
c:\windows\userinit.exe
2⤵
- Modifies WinLogon for persistence
- Modifies visiblity of hidden/system files in Explorer
- Modifies Installed Components in the registry
- Executes dropped EXE
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:648

\??\c:\windows\spoolsw.exe
c:\windows\spoolsw.exe SE
3⤵
- Executes dropped EXE
- Drops file in Windows directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4720

\??\c:\windows\swchost.exe
c:\windows\swchost.exe
4⤵
- Modifies WinLogon for persistence
- Modifies visiblity of hidden/system files in Explorer
- Modifies Installed Components in the registry
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2832

\??\c:\windows\spoolsw.exe
c:\windows\spoolsw.exe PR
5⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:456

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

Winlogon Helper DLL

T1547.004

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

System Information Discovery