f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103

Processes:

explorer.exesvchost.exe

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

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

evasion

Hidden Files and Directories

T1564.001

Modify Registry

Processes:

explorer.exesvchost.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

Modifies Installed Components in the registry 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

svchost.exeexplorer.exe

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

Executes dropped EXE 4 IoCs

Processes:

explorer.exespoolsv.exesvchost.exespoolsv.exe

pid process

1544 explorer.exe
312 spoolsv.exe
2208 svchost.exe
808 spoolsv.exe

pid	process
1544	explorer.exe
312	spoolsv.exe
2208	svchost.exe
808	spoolsv.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

svchost.exeexplorer.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	explorer.exe

Drops file in Windows directory 6 IoCs

Processes:

f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exeexplorer.exespoolsv.exesvchost.exe

description	ioc	process
File opened for modification	\??\c:\windows\system\explorer.exe	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe
File opened for modification	\??\c:\windows\system\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	spoolsv.exe
File opened for modification	\??\c:\windows\system\explorer.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	svchost.exe
File opened for modification	C:\Windows\system\udsys.exe	explorer.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:

f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exeexplorer.exesvchost.exe

pid	process
1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe
1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe
1544	explorer.exe
1544	explorer.exe
1544	explorer.exe
1544	explorer.exe
1544	explorer.exe
1544	explorer.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
2208	svchost.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
1544	explorer.exe
2208	svchost.exe
1544	explorer.exe
2208	svchost.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
1544	explorer.exe
2208	svchost.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe
1544	explorer.exe
1544	explorer.exe
2208	svchost.exe
2208	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exesvchost.exe

pid process

1544 explorer.exe
2208 svchost.exe

pid	process
1544	explorer.exe
2208	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe
1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe
1544	explorer.exe
1544	explorer.exe
312	spoolsv.exe
312	spoolsv.exe
2208	svchost.exe
2208	svchost.exe
808	spoolsv.exe
808	spoolsv.exe
1544	explorer.exe
1544	explorer.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 1148 wrote to memory of 1544	1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe	explorer.exe
PID 1148 wrote to memory of 1544	1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe	explorer.exe
PID 1148 wrote to memory of 1544	1148	f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe	explorer.exe
PID 1544 wrote to memory of 312	1544	explorer.exe	spoolsv.exe
PID 1544 wrote to memory of 312	1544	explorer.exe	spoolsv.exe
PID 1544 wrote to memory of 312	1544	explorer.exe	spoolsv.exe
PID 312 wrote to memory of 2208	312	spoolsv.exe	svchost.exe
PID 312 wrote to memory of 2208	312	spoolsv.exe	svchost.exe
PID 312 wrote to memory of 2208	312	spoolsv.exe	svchost.exe
PID 2208 wrote to memory of 808	2208	svchost.exe	spoolsv.exe
PID 2208 wrote to memory of 808	2208	svchost.exe	spoolsv.exe
PID 2208 wrote to memory of 808	2208	svchost.exe	spoolsv.exe
PID 2208 wrote to memory of 4864	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 4864	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 4864	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 5076	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 5076	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 5076	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 2320	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 2320	2208	svchost.exe	at.exe
PID 2208 wrote to memory of 2320	2208	svchost.exe	at.exe

C:\Users\Admin\AppData\Local\Temp\f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe
"C:\Users\Admin\AppData\Local\Temp\f3578a382a156f3da91e5dd1c0fe5ac7fe40954dfc5fd95e3d222e4b8f130103.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1148

\??\c:\windows\system\explorer.exe
c:\windows\system\explorer.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 Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1544

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe SE
3⤵
- Executes dropped EXE
- Drops file in Windows directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:312

\??\c:\windows\system\svchost.exe
c:\windows\system\svchost.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:2208

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe PR
5⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:808

C:\Windows\SysWOW64\at.exe
at 05:18 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:4864

C:\Windows\SysWOW64\at.exe
at 05:19 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:5076

C:\Windows\SysWOW64\at.exe
at 05:20 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:2320

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