nanocore | 6421b8dd3f429921cd2cd3b9d6809f8a860d2f6acb58be9387ff14541dc07878

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	eyxvHINGh6Tb3k1E.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	eyxvHINGh6Tb3k1E.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	eyxvHINGh6Tb3k1E.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	download.exe

Executes dropped EXE 1 IoCs

pid	Process
4132	eyxvHINGh6Tb3k1E.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	download.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	eyxvHINGh6Tb3k1E.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	eyxvHINGh6Tb3k1E.exe

Checks for VirtualBox DLLs, possible anti-VM trick 1 TTPs 1 IoCs

Certain files are specific to VirtualBox VMs and can be used to detect execution in a VM.

System Information Discovery

description	ioc	Process
File opened (read-only)	\??\VBoxMiniRdrDN	eyxvHINGh6Tb3k1E.exe

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	download.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4132	eyxvHINGh6Tb3k1E.exe
4132	eyxvHINGh6Tb3k1E.exe
4132	eyxvHINGh6Tb3k1E.exe
4132	eyxvHINGh6Tb3k1E.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3604	download.exe
Token: SeDebugPrivilege	4132	eyxvHINGh6Tb3k1E.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3604 wrote to memory of 4132	3604	download.exe	87
PID 3604 wrote to memory of 4132	3604	download.exe	87
PID 4132 wrote to memory of 3608	4132	eyxvHINGh6Tb3k1E.exe	89
PID 4132 wrote to memory of 3608	4132	eyxvHINGh6Tb3k1E.exe	89

C:\Users\Admin\AppData\Local\Temp\download.exe
"C:\Users\Admin\AppData\Local\Temp\download.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Checks whether UAC is enabled
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3604
- C:\Users\Admin\AppData\Local\Temp\eyxvHINGh6Tb3k1E.exe
  "C:\Users\Admin\AppData\Local\Temp\eyxvHINGh6Tb3k1E.exe"
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Maps connected drives based on registry
  - Checks for VirtualBox DLLs, possible anti-VM trick
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4132
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c pause
    3⤵
    PID:3608

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

6

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion