nanocore | f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe = "0"	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

5044 powershell.exe

pid	process
5044	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3419463127-3903270268-2580331543-1000\Control Panel\International\Geo\Nation	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe = "0"	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

jsc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WAN Subsystem = "C:\\Program Files (x86)\\WAN Subsystem\\wanss.exe"	jsc.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	pid	process	target process
PID 3536 set thread context of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe

Drops file in Program Files directory 2 IoCs

Processes:

jsc.exe

description	ioc	process
File created	C:\Program Files (x86)\WAN Subsystem\wanss.exe	jsc.exe
File opened for modification	C:\Program Files (x86)\WAN Subsystem\wanss.exe	jsc.exe

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

System Information Discovery
T1082
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exeschtasks.exe

pid process

2944 schtasks.exe
4812 schtasks.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exejsc.exe

pid process

5044 powershell.exe
5044 powershell.exe
4928 jsc.exe
4928 jsc.exe
4928 jsc.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

jsc.exe

pid process

4928 jsc.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exejsc.exe

description pid process

Token: SeDebugPrivilege 5044 powershell.exe
Token: SeDebugPrivilege 4928 jsc.exe

pid	process
2944	schtasks.exe
4812	schtasks.exe

pid	process
5044	powershell.exe
5044	powershell.exe
4928	jsc.exe
4928	jsc.exe
4928	jsc.exe

pid	process
4928	jsc.exe

description	pid	process
Token: SeDebugPrivilege	5044	powershell.exe
Token: SeDebugPrivilege	4928	jsc.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exejsc.exe

description	pid	process	target process
PID 3536 wrote to memory of 5044	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	powershell.exe
PID 3536 wrote to memory of 5044	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	powershell.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 3536 wrote to memory of 4928	3536	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe	jsc.exe
PID 4928 wrote to memory of 2944	4928	jsc.exe	schtasks.exe
PID 4928 wrote to memory of 2944	4928	jsc.exe	schtasks.exe
PID 4928 wrote to memory of 2944	4928	jsc.exe	schtasks.exe
PID 4928 wrote to memory of 4812	4928	jsc.exe	schtasks.exe
PID 4928 wrote to memory of 4812	4928	jsc.exe	schtasks.exe
PID 4928 wrote to memory of 4812	4928	jsc.exe	schtasks.exe

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

Processes:

f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe

C:\Users\Admin\AppData\Local\Temp\f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe
"C:\Users\Admin\AppData\Local\Temp\f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe"
1⤵
- UAC bypass
- Windows security bypass
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3536

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd.exe" -Force
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5044

C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe"
2⤵
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4928

C:\Windows\SysWOW64\schtasks.exe
"schtasks.exe" /create /f /tn "WAN Subsystem" /xml "C:\Users\Admin\AppData\Local\Temp\tmpD1E6.tmp"
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2944

C:\Windows\SysWOW64\schtasks.exe
"schtasks.exe" /create /f /tn "WAN Subsystem Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmpD5CF.tmp"
3⤵
- Scheduled Task/Job: Scheduled Task
PID:4812

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry