77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d

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:

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

Executes dropped EXE 7 IoCs

Processes:

77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe nchsetup.exeicsys.icn.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
2520	nchsetup.exe
2556	icsys.icn.exe
2452	explorer.exe
2480	spoolsv.exe
1648	svchost.exe
2764	spoolsv.exe

Loads dropped DLL 15 IoCs

Processes:

77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe icsys.icn.exeexplorer.exespoolsv.exesvchost.exe

pid	process
1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
2556	icsys.icn.exe
2556	icsys.icn.exe
2452	explorer.exe
2452	explorer.exe
2480	spoolsv.exe
2480	spoolsv.exe
1648	svchost.exe
1648	svchost.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

svchost.exenchsetup.exeexplorer.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\ExpressZipInstall = "c:\\users\\admin\\appdata\\local\\temp\\77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe\u00a0"	nchsetup.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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	svchost.exe

Drops file in Windows directory 6 IoCs

Processes:

explorer.exesvchost.exeicsys.icn.exespoolsv.exe

description	ioc	process
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
File opened for modification	\??\c:\windows\system\svchost.exe	spoolsv.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
2556	icsys.icn.exe
2452	explorer.exe
2452	explorer.exe
2452	explorer.exe
1648	svchost.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe
2452	explorer.exe
1648	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 3 IoCs

Processes:

explorer.exesvchost.exenchsetup.exe

pid process

2452 explorer.exe
1648 svchost.exe
2520 nchsetup.exe

pid	process
2452	explorer.exe
1648	svchost.exe
2520	nchsetup.exe

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exeicsys.icn.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
2556	icsys.icn.exe
2556	icsys.icn.exe
2452	explorer.exe
2452	explorer.exe
2480	spoolsv.exe
2480	spoolsv.exe
1648	svchost.exe
1648	svchost.exe
2764	spoolsv.exe
2764	spoolsv.exe
2452	explorer.exe
2452	explorer.exe

Suspicious use of WriteProcessMemory 43 IoCs

Processes:

77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe icsys.icn.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 1740 wrote to memory of 1748	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
PID 1740 wrote to memory of 1748	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
PID 1740 wrote to memory of 1748	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
PID 1740 wrote to memory of 1748	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1748 wrote to memory of 2520	1748	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	nchsetup.exe
PID 1740 wrote to memory of 2556	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	icsys.icn.exe
PID 1740 wrote to memory of 2556	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	icsys.icn.exe
PID 1740 wrote to memory of 2556	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	icsys.icn.exe
PID 1740 wrote to memory of 2556	1740	77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe	icsys.icn.exe
PID 2556 wrote to memory of 2452	2556	icsys.icn.exe	explorer.exe
PID 2556 wrote to memory of 2452	2556	icsys.icn.exe	explorer.exe
PID 2556 wrote to memory of 2452	2556	icsys.icn.exe	explorer.exe
PID 2556 wrote to memory of 2452	2556	icsys.icn.exe	explorer.exe
PID 2452 wrote to memory of 2480	2452	explorer.exe	spoolsv.exe
PID 2452 wrote to memory of 2480	2452	explorer.exe	spoolsv.exe
PID 2452 wrote to memory of 2480	2452	explorer.exe	spoolsv.exe
PID 2452 wrote to memory of 2480	2452	explorer.exe	spoolsv.exe
PID 2480 wrote to memory of 1648	2480	spoolsv.exe	svchost.exe
PID 2480 wrote to memory of 1648	2480	spoolsv.exe	svchost.exe
PID 2480 wrote to memory of 1648	2480	spoolsv.exe	svchost.exe
PID 2480 wrote to memory of 1648	2480	spoolsv.exe	svchost.exe
PID 1648 wrote to memory of 2764	1648	svchost.exe	spoolsv.exe
PID 1648 wrote to memory of 2764	1648	svchost.exe	spoolsv.exe
PID 1648 wrote to memory of 2764	1648	svchost.exe	spoolsv.exe
PID 1648 wrote to memory of 2764	1648	svchost.exe	spoolsv.exe
PID 1648 wrote to memory of 2168	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2168	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2168	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2168	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 3064	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 3064	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 3064	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 3064	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2388	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2388	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2388	1648	svchost.exe	at.exe
PID 1648 wrote to memory of 2388	1648	svchost.exe	at.exe

C:\Users\Admin\AppData\Local\Temp\77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
"C:\Users\Admin\AppData\Local\Temp\77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1740

\??\c:\users\admin\appdata\local\temp\77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
c:\users\admin\appdata\local\temp\77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe
2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1748

C:\Users\Admin\AppData\Local\Temp\n1s\nchsetup.exe
"C:\Users\Admin\AppData\Local\Temp\n1s\nchsetup.exe" -installer "c:\users\admin\appdata\local\temp\77b75ef2b087e43af291b2dde7be123f91eeec5d67e918186884e67bfa69c02d.exe " -instdata "C:\Users\Admin\AppData\Local\Temp\n1s\nchdata.dat"
3⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: GetForegroundWindowSpam
PID:2520

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:2556

\??\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:2452

\??\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:2480

\??\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:1648

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe PR
6⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:2764

C:\Windows\SysWOW64\at.exe
at 23:23 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
6⤵
PID:2168

C:\Windows\SysWOW64\at.exe
at 23:24 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
6⤵
PID:3064

C:\Windows\SysWOW64\at.exe
at 23:25 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
6⤵
PID:2388

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