nanocore | e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe = "0"	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

Detects executables packed with or use KoiVM 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4660-4-0x0000020744FE0000-0x000002074506C000-memory.dmp	INDICATOR_EXE_Packed_KoiVM

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

1468 powershell.exe

pid	process
1468	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:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

Unexpected DNS network traffic destination 7 IoCs

Network traffic to other servers than the configured DNS servers was detected on the DNS port.

Processes:

description	ioc
Destination IP	37.235.1.174
Destination IP	37.235.1.177
Destination IP	37.235.1.174
Destination IP	37.235.1.174
Destination IP	37.235.1.177
Destination IP	37.235.1.177
Destination IP	37.235.1.174

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe = "0"	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

regsvcs.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\DHCP Service = "C:\\Program Files (x86)\\DHCP Service\\dhcpsv.exe"	regsvcs.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	pid	process	target process
PID 4660 set thread context of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe

Drops file in Program Files directory 2 IoCs

Processes:

regsvcs.exe

description	ioc	process
File created	C:\Program Files (x86)\DHCP Service\dhcpsv.exe	regsvcs.exe
File opened for modification	C:\Program Files (x86)\DHCP Service\dhcpsv.exe	regsvcs.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exeregsvcs.exe

pid process

1468 powershell.exe
1468 powershell.exe
4988 regsvcs.exe
4988 regsvcs.exe
4988 regsvcs.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

regsvcs.exe

pid process

4988 regsvcs.exe

pid	process
1468	powershell.exe
1468	powershell.exe
4988	regsvcs.exe
4988	regsvcs.exe
4988	regsvcs.exe

pid	process
4988	regsvcs.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exepowershell.exeregsvcs.exe

description	pid	process
Token: SeDebugPrivilege	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe
Token: SeDebugPrivilege	1468	powershell.exe
Token: SeDebugPrivilege	4988	regsvcs.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	pid	process	target process
PID 4660 wrote to memory of 1468	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	powershell.exe
PID 4660 wrote to memory of 1468	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	powershell.exe
PID 4660 wrote to memory of 2132	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regasm.exe
PID 4660 wrote to memory of 2132	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regasm.exe
PID 4660 wrote to memory of 2132	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regasm.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe
PID 4660 wrote to memory of 4988	4660	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe	regsvcs.exe

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

Processes:

e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe

C:\Users\Admin\AppData\Local\Temp\e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe
"C:\Users\Admin\AppData\Local\Temp\e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.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 AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4660

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\e28f241aecdb850910f2e2dea30dcbc23d31578ea3b7a74c9fa30460669f7c83.exe" -Force
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1468

C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
2⤵
PID:2132

C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe"
2⤵
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:4988

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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

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