asyncrat | 6fed9ac910b4570ce24f3d4230fbe550f181ad5f1ab089725e3eb9f7e8142f2e

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	PO-341999-PDF.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	PO-341999-PDF.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\PO-341999-PDF.exe = "0"	PO-341999-PDF.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
4880	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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	PO-341999-PDF.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\PO-341999-PDF.exe = "0"	PO-341999-PDF.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	PO-341999-PDF.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	PO-341999-PDF.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	PO-341999-PDF.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	PO-341999-PDF.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1728 set thread context of 1192	1728	PO-341999-PDF.exe	89

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regasm.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4880	powershell.exe
4880	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4880	powershell.exe
Token: SeDebugPrivilege	1192	regasm.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1728 wrote to memory of 4880	1728	PO-341999-PDF.exe	86
PID 1728 wrote to memory of 4880	1728	PO-341999-PDF.exe	86
PID 1728 wrote to memory of 1444	1728	PO-341999-PDF.exe	87
PID 1728 wrote to memory of 1444	1728	PO-341999-PDF.exe	87
PID 1728 wrote to memory of 1444	1728	PO-341999-PDF.exe	87
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 1192	1728	PO-341999-PDF.exe	89
PID 1728 wrote to memory of 3964	1728	PO-341999-PDF.exe	90
PID 1728 wrote to memory of 3964	1728	PO-341999-PDF.exe	90
PID 1728 wrote to memory of 3964	1728	PO-341999-PDF.exe	90

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"	PO-341999-PDF.exe

C:\Users\Admin\AppData\Local\Temp\PO-341999-PDF.exe
"C:\Users\Admin\AppData\Local\Temp\PO-341999-PDF.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:1728
- 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\PO-341999-PDF.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4880
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
  2⤵
  PID:1444
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:1192
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
  2⤵
  PID:3964

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry