nanocore | f746d18424c35a1c52b119dc13aa42b613301fa45fddd94a084707384a41fabd

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

CSXER09OOPMND--3098376TDGH.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	CSXER09OOPMND--3098376TDGH.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

CSXER09OOPMND--3098376TDGH.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	CSXER09OOPMND--3098376TDGH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\CSXER09OOPMND--3098376TDGH.exe = "0"	CSXER09OOPMND--3098376TDGH.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

3752 powershell.exe

pid	process
3752	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:

CSXER09OOPMND--3098376TDGH.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2480455240-981575606-1030659066-1000\Control Panel\International\Geo\Nation	CSXER09OOPMND--3098376TDGH.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

CSXER09OOPMND--3098376TDGH.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	CSXER09OOPMND--3098376TDGH.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	CSXER09OOPMND--3098376TDGH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\CSXER09OOPMND--3098376TDGH.exe = "0"	CSXER09OOPMND--3098376TDGH.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

msbuild.exe

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

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

Processes:

CSXER09OOPMND--3098376TDGH.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	CSXER09OOPMND--3098376TDGH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	CSXER09OOPMND--3098376TDGH.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

CSXER09OOPMND--3098376TDGH.exe

description pid process target process

PID 1112 set thread context of 3180 1112 CSXER09OOPMND--3098376TDGH.exe msbuild.exe

description	pid	process	target process
PID 1112 set thread context of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe

Drops file in Program Files directory 2 IoCs

Processes:

msbuild.exe

description	ioc	process
File created	C:\Program Files (x86)\WPA Subsystem\wpass.exe	msbuild.exe
File opened for modification	C:\Program Files (x86)\WPA Subsystem\wpass.exe	msbuild.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

2440 schtasks.exe
4824 schtasks.exe
Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exemsbuild.exe

pid process

3752 powershell.exe
3752 powershell.exe
3180 msbuild.exe
3180 msbuild.exe
3180 msbuild.exe
3180 msbuild.exe
3180 msbuild.exe
3180 msbuild.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

msbuild.exe

pid process

3180 msbuild.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exemsbuild.exe

description pid process

Token: SeDebugPrivilege 3752 powershell.exe
Token: SeDebugPrivilege 3180 msbuild.exe

pid	process
2440	schtasks.exe
4824	schtasks.exe

pid	process
3752	powershell.exe
3752	powershell.exe
3180	msbuild.exe
3180	msbuild.exe
3180	msbuild.exe
3180	msbuild.exe
3180	msbuild.exe
3180	msbuild.exe

pid	process
3180	msbuild.exe

description	pid	process
Token: SeDebugPrivilege	3752	powershell.exe
Token: SeDebugPrivilege	3180	msbuild.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

CSXER09OOPMND--3098376TDGH.exemsbuild.exe

description	pid	process	target process
PID 1112 wrote to memory of 3752	1112	CSXER09OOPMND--3098376TDGH.exe	powershell.exe
PID 1112 wrote to memory of 3752	1112	CSXER09OOPMND--3098376TDGH.exe	powershell.exe
PID 1112 wrote to memory of 1544	1112	CSXER09OOPMND--3098376TDGH.exe	regasm.exe
PID 1112 wrote to memory of 1544	1112	CSXER09OOPMND--3098376TDGH.exe	regasm.exe
PID 1112 wrote to memory of 1544	1112	CSXER09OOPMND--3098376TDGH.exe	regasm.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3180	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3956	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3956	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 1112 wrote to memory of 3956	1112	CSXER09OOPMND--3098376TDGH.exe	msbuild.exe
PID 3180 wrote to memory of 2440	3180	msbuild.exe	schtasks.exe
PID 3180 wrote to memory of 2440	3180	msbuild.exe	schtasks.exe
PID 3180 wrote to memory of 2440	3180	msbuild.exe	schtasks.exe
PID 3180 wrote to memory of 4824	3180	msbuild.exe	schtasks.exe
PID 3180 wrote to memory of 4824	3180	msbuild.exe	schtasks.exe
PID 3180 wrote to memory of 4824	3180	msbuild.exe	schtasks.exe

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

Processes:

CSXER09OOPMND--3098376TDGH.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	CSXER09OOPMND--3098376TDGH.exe

C:\Users\Admin\AppData\Local\Temp\CSXER09OOPMND--3098376TDGH.exe
"C:\Users\Admin\AppData\Local\Temp\CSXER09OOPMND--3098376TDGH.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:1112

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\CSXER09OOPMND--3098376TDGH.exe" -Force
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3752

C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
2⤵
PID:1544

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.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:3180

C:\Windows\SysWOW64\schtasks.exe
"schtasks.exe" /create /f /tn "WPA Subsystem" /xml "C:\Users\Admin\AppData\Local\Temp\tmpB045.tmp"
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2440

C:\Windows\SysWOW64\schtasks.exe
"schtasks.exe" /create /f /tn "WPA Subsystem Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmpB101.tmp"
3⤵
- Scheduled Task/Job: Scheduled Task
PID:4824

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
2⤵
PID:3956

Network

MITRE ATT&CK Matrix ATT&CK v13

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