nanocore | 2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe = "0"	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.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

pid	Process
1856	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1750093773-264148664-1320403265-1000\Control Panel\International\Geo\Nation	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe = "0"	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\DPI Service = "C:\\Program Files (x86)\\DPI Service\\dpisv.exe"	msbuild.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2152 set thread context of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\DPI Service\dpisv.exe	msbuild.exe
File opened for modification	C:\Program Files (x86)\DPI Service\dpisv.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

pid	Process
1436	schtasks.exe
1248	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1856	powershell.exe
1856	powershell.exe
3924	msbuild.exe
3924	msbuild.exe
3924	msbuild.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3924	msbuild.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1856	powershell.exe
Token: SeDebugPrivilege	3924	msbuild.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2152 wrote to memory of 1856	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	86
PID 2152 wrote to memory of 1856	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	86
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 3924	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	88
PID 2152 wrote to memory of 4812	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	89
PID 2152 wrote to memory of 4812	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	89
PID 2152 wrote to memory of 4812	2152	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe	89
PID 3924 wrote to memory of 1436	3924	msbuild.exe	93
PID 3924 wrote to memory of 1436	3924	msbuild.exe	93
PID 3924 wrote to memory of 1436	3924	msbuild.exe	93
PID 3924 wrote to memory of 1248	3924	msbuild.exe	95
PID 3924 wrote to memory of 1248	3924	msbuild.exe	95
PID 3924 wrote to memory of 1248	3924	msbuild.exe	95

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe

C:\Users\Admin\AppData\Local\Temp\2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe
"C:\Users\Admin\AppData\Local\Temp\2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.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:2152
- 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\2b4d871271fbc3f9487d370b9315bca0b9ca44ee81ecce6b89a57b31f7cf4598.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1856
- 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:3924
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks.exe" /create /f /tn "DPI Service" /xml "C:\Users\Admin\AppData\Local\Temp\tmp62D1.tmp"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1436
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks.exe" /create /f /tn "DPI Service Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmp639D.tmp"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1248
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
  2⤵
  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

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

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

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