orcus | 1a740ea5fc256aeac6c2df54d489e502cd2b752c20c09495ff879705f4bf5a0c

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	a9aa350b786356d7d78279e338ccc590N.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	Synaptics.exe

Orcurs Rat Executable 11 IoCs

resource	yara_rule
behavioral2/memory/4968-4-0x0000000000780000-0x0000000001411000-memory.dmp	orcus
behavioral2/memory/4968-5-0x0000000000780000-0x0000000001411000-memory.dmp	orcus
behavioral2/files/0x0009000000023473-11.dat	orcus
behavioral2/memory/3412-136-0x0000000000610000-0x00000000006F8000-memory.dmp	orcus
behavioral2/memory/4968-138-0x0000000000780000-0x0000000001411000-memory.dmp	orcus
behavioral2/memory/1512-145-0x0000000000920000-0x00000000015B1000-memory.dmp	orcus
behavioral2/memory/1512-146-0x0000000000920000-0x00000000015B1000-memory.dmp	orcus
behavioral2/memory/1512-286-0x0000000000920000-0x00000000015B1000-memory.dmp	orcus
behavioral2/memory/1512-285-0x0000000000920000-0x00000000015B1000-memory.dmp	orcus
behavioral2/memory/1512-290-0x0000000000920000-0x00000000015B1000-memory.dmp	orcus
behavioral2/memory/1512-314-0x0000000000920000-0x00000000015B1000-memory.dmp	orcus

Checks BIOS information in registry 2 TTPs 4 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	a9aa350b786356d7d78279e338ccc590N.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	a9aa350b786356d7d78279e338ccc590N.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Synaptics.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Synaptics.exe

Checks computer location settings 2 TTPs 3 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-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	a9aa350b786356d7d78279e338ccc590N.exe
Key value queried	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	Synaptics.exe
Key value queried	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	._cache_a9aa350b786356d7d78279e338ccc590N.exe

Executes dropped EXE 4 IoCs

pid	Process
3412	._cache_a9aa350b786356d7d78279e338ccc590N.exe
1512	Synaptics.exe
1520	Orcus.exe
692	._cache_Synaptics.exe

Themida packer 16 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/4968-0-0x0000000000780000-0x0000000001411000-memory.dmp	themida
behavioral2/memory/4968-2-0x0000000000780000-0x0000000001411000-memory.dmp	themida
behavioral2/memory/4968-3-0x0000000000780000-0x0000000001411000-memory.dmp	themida
behavioral2/memory/4968-4-0x0000000000780000-0x0000000001411000-memory.dmp	themida
behavioral2/memory/4968-5-0x0000000000780000-0x0000000001411000-memory.dmp	themida
behavioral2/files/0x000a00000002342e-72.dat	themida
behavioral2/memory/1512-141-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-140-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-139-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/4968-138-0x0000000000780000-0x0000000001411000-memory.dmp	themida
behavioral2/memory/1512-145-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-146-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-286-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-285-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-290-0x0000000000920000-0x00000000015B1000-memory.dmp	themida
behavioral2/memory/1512-314-0x0000000000920000-0x00000000015B1000-memory.dmp	themida

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Synaptics Pointing Device Driver = "C:\\ProgramData\\Synaptics\\Synaptics.exe"	a9aa350b786356d7d78279e338ccc590N.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	a9aa350b786356d7d78279e338ccc590N.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Synaptics.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4968	a9aa350b786356d7d78279e338ccc590N.exe
1512	Synaptics.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Orcus\Orcus.exe	._cache_a9aa350b786356d7d78279e338ccc590N.exe
File opened for modification	C:\Program Files (x86)\Orcus\Orcus.exe	._cache_a9aa350b786356d7d78279e338ccc590N.exe
File created	C:\Program Files (x86)\Orcus\Orcus.exe.config	._cache_a9aa350b786356d7d78279e338ccc590N.exe
File opened for modification	C:\Program Files (x86)\Orcus\Orcus.exe	._cache_Synaptics.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 5 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	a9aa350b786356d7d78279e338ccc590N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	._cache_a9aa350b786356d7d78279e338ccc590N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Synaptics.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Orcus.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	._cache_Synaptics.exe

Checks processor information in registry 2 TTPs 3 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	Synaptics.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	a9aa350b786356d7d78279e338ccc590N.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4664	EXCEL.EXE

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1520	Orcus.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1520	Orcus.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1520	Orcus.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
4664	EXCEL.EXE
4664	EXCEL.EXE
4664	EXCEL.EXE
4664	EXCEL.EXE
1520	Orcus.exe
4664	EXCEL.EXE
4664	EXCEL.EXE
4664	EXCEL.EXE
4664	EXCEL.EXE
4664	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4968 wrote to memory of 3412	4968	a9aa350b786356d7d78279e338ccc590N.exe	86
PID 4968 wrote to memory of 3412	4968	a9aa350b786356d7d78279e338ccc590N.exe	86
PID 4968 wrote to memory of 3412	4968	a9aa350b786356d7d78279e338ccc590N.exe	86
PID 4968 wrote to memory of 1512	4968	a9aa350b786356d7d78279e338ccc590N.exe	87
PID 4968 wrote to memory of 1512	4968	a9aa350b786356d7d78279e338ccc590N.exe	87
PID 4968 wrote to memory of 1512	4968	a9aa350b786356d7d78279e338ccc590N.exe	87
PID 3412 wrote to memory of 1520	3412	._cache_a9aa350b786356d7d78279e338ccc590N.exe	88
PID 3412 wrote to memory of 1520	3412	._cache_a9aa350b786356d7d78279e338ccc590N.exe	88
PID 3412 wrote to memory of 1520	3412	._cache_a9aa350b786356d7d78279e338ccc590N.exe	88
PID 1512 wrote to memory of 692	1512	Synaptics.exe	89
PID 1512 wrote to memory of 692	1512	Synaptics.exe	89
PID 1512 wrote to memory of 692	1512	Synaptics.exe	89

C:\Users\Admin\AppData\Local\Temp\a9aa350b786356d7d78279e338ccc590N.exe
"C:\Users\Admin\AppData\Local\Temp\a9aa350b786356d7d78279e338ccc590N.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Adds Run key to start application
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4968
- C:\Users\Admin\AppData\Local\Temp\._cache_a9aa350b786356d7d78279e338ccc590N.exe
  "C:\Users\Admin\AppData\Local\Temp\._cache_a9aa350b786356d7d78279e338ccc590N.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3412
- - C:\Program Files (x86)\Orcus\Orcus.exe
    "C:\Program Files (x86)\Orcus\Orcus.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    PID:1520
- C:\ProgramData\Synaptics\Synaptics.exe
  "C:\ProgramData\Synaptics\Synaptics.exe" InjUpdate
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Checks computer location settings
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1512
- - C:\Users\Admin\AppData\Local\Temp\._cache_Synaptics.exe
    "C:\Users\Admin\AppData\Local\Temp\._cache_Synaptics.exe" InjUpdate
    3⤵
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    PID:692

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" /automation -Embedding
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:4664

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

5

System Information Discovery

6

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion