3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c

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-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\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 6 IoCs

Processes:

3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe icsys.icn.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
2752	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
2608	icsys.icn.exe
2688	explorer.exe
2716	spoolsv.exe
2324	svchost.exe
2428	spoolsv.exe

Loads dropped DLL 11 IoCs

Processes:

3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exeicsys.icn.exeexplorer.exespoolsv.exesvchost.exe

pid	process
1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
2608	icsys.icn.exe
2608	icsys.icn.exe
2688	explorer.exe
2688	explorer.exe
2716	spoolsv.exe
2716	spoolsv.exe
2324	svchost.exe
2324	svchost.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

explorer.exesvchost.exe

description	ioc	process
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
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

Drops file in Windows directory 6 IoCs

Processes:

spoolsv.exeexplorer.exesvchost.exeicsys.icn.exe

description	ioc	process
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
File opened for modification	\??\c:\windows\system\explorer.exe	icsys.icn.exe
File opened for modification	\??\c:\windows\system\spoolsv.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:

icsys.icn.exeexplorer.exesvchost.exe

pid	process
2608	icsys.icn.exe
2688	explorer.exe
2688	explorer.exe
2688	explorer.exe
2324	svchost.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe
2688	explorer.exe
2324	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exesvchost.exe

pid process

2688 explorer.exe
2324 svchost.exe

pid	process
2688	explorer.exe
2324	svchost.exe

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exeicsys.icn.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
2608	icsys.icn.exe
2608	icsys.icn.exe
2688	explorer.exe
2688	explorer.exe
2716	spoolsv.exe
2716	spoolsv.exe
2324	svchost.exe
2324	svchost.exe
2428	spoolsv.exe
2428	spoolsv.exe
2688	explorer.exe
2688	explorer.exe

Suspicious use of WriteProcessMemory 32 IoCs

Processes:

3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exeicsys.icn.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 1640 wrote to memory of 2608	1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe	icsys.icn.exe
PID 1640 wrote to memory of 2608	1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe	icsys.icn.exe
PID 1640 wrote to memory of 2608	1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe	icsys.icn.exe
PID 1640 wrote to memory of 2608	1640	3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe	icsys.icn.exe
PID 2608 wrote to memory of 2688	2608	icsys.icn.exe	explorer.exe
PID 2608 wrote to memory of 2688	2608	icsys.icn.exe	explorer.exe
PID 2608 wrote to memory of 2688	2608	icsys.icn.exe	explorer.exe
PID 2608 wrote to memory of 2688	2608	icsys.icn.exe	explorer.exe
PID 2688 wrote to memory of 2716	2688	explorer.exe	spoolsv.exe
PID 2688 wrote to memory of 2716	2688	explorer.exe	spoolsv.exe
PID 2688 wrote to memory of 2716	2688	explorer.exe	spoolsv.exe
PID 2688 wrote to memory of 2716	2688	explorer.exe	spoolsv.exe
PID 2716 wrote to memory of 2324	2716	spoolsv.exe	svchost.exe
PID 2716 wrote to memory of 2324	2716	spoolsv.exe	svchost.exe
PID 2716 wrote to memory of 2324	2716	spoolsv.exe	svchost.exe
PID 2716 wrote to memory of 2324	2716	spoolsv.exe	svchost.exe
PID 2324 wrote to memory of 2428	2324	svchost.exe	spoolsv.exe
PID 2324 wrote to memory of 2428	2324	svchost.exe	spoolsv.exe
PID 2324 wrote to memory of 2428	2324	svchost.exe	spoolsv.exe
PID 2324 wrote to memory of 2428	2324	svchost.exe	spoolsv.exe
PID 2324 wrote to memory of 2104	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2104	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2104	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2104	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2192	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2192	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2192	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 2192	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 1180	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 1180	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 1180	2324	svchost.exe	at.exe
PID 2324 wrote to memory of 1180	2324	svchost.exe	at.exe

C:\Users\Admin\AppData\Local\Temp\3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
"C:\Users\Admin\AppData\Local\Temp\3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1640
- \??\c:\users\admin\appdata\local\temp\3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
  c:\users\admin\appdata\local\temp\3f8043c9ee50757444607d22f70c94ed3df175add0bd4dbb09239a44e1583c8c.exe
  2⤵
  - Executes dropped EXE
  PID:2752
- C:\Users\Admin\AppData\Local\icsys.icn.exe
  C:\Users\Admin\AppData\Local\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2608
- - \??\c:\windows\system\explorer.exe
    c:\windows\system\explorer.exe
    3⤵
    - Modifies WinLogon for persistence
    - Modifies visiblity of hidden/system files in Explorer
    - Modifies Installed Components in the registry
    - Executes dropped EXE
    - Loads dropped DLL
    - 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:2688
  - - \??\c:\windows\system\spoolsv.exe
      c:\windows\system\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Drops file in Windows directory
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2716
    - - \??\c:\windows\system\svchost.exe
        
        c:\windows\system\svchost.exe
        5⤵
        Modifies WinLogon for persistence
        Modifies visiblity of hidden/system files in Explorer
        Modifies Installed Components in the registry
        Executes dropped EXE
        Loads dropped DLL
        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:2324
      - \??\c:\windows\system\spoolsv.exe
        
        c:\windows\system\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        Suspicious use of SetWindowsHookEx
        
        PID:2428
      - C:\Windows\SysWOW64\at.exe
        
        at 20:55 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        6⤵
        
        PID:2104
      - C:\Windows\SysWOW64\at.exe
        
        at 20:56 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        6⤵
        
        PID:2192
      - C:\Windows\SysWOW64\at.exe
        
        at 20:57 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        6⤵
        
        PID:1180

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