rms | 6f78a9ec4dde9902a9eafe74d46d3807c1807323202ae51f54bf1c3874bbac77

Virtualization/Sandbox Evasion

T1497

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

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2508	netsh.exe

Sets DLL path for service in the registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\TermService\Parameters\ServiceDll = "%ProgramFiles%\\RDP Wrapper\\rdpwrap.dll"	RDPWinst.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	smss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	smss.exe

Checks computer location settings 2 TTPs 4 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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	winserv.exe
Key value queried	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	smss.exe
Key value queried	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	winserv.exe
Key value queried	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	winserv.exe

Executes dropped EXE 5 IoCs

pid	Process
1788	winserv.exe
4932	winserv.exe
2376	RDPWinst.exe
3160	winserv.exe
4340	winserv.exe

Loads dropped DLL 1 IoCs

pid	Process
1084	svchost.exe

Themida packer 13 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral8/memory/1124-0-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-2-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-3-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-4-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-5-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-6-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-7-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-8-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-9-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-69-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-81-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-82-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida
behavioral8/memory/1124-92-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	themida

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	smss.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
30	ip-api.com

Modifies WinLogon 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AllowMultipleTSSessions = "1"	RDPWinst.exe

AutoIT Executable 11 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral8/memory/1124-3-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-4-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-5-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-6-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-7-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-8-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-9-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-69-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-81-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-82-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe
behavioral8/memory/1124-92-0x00007FF7803C0000-0x00007FF781219000-memory.dmp	autoit_exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\rfxvmt.dll	RDPWinst.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1124	smss.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\RDP Wrapper\rdpwrap.ini	smss.exe
File created	C:\Program Files\RDP Wrapper\rdpwrap.ini	RDPWinst.exe
File created	C:\Program Files\RDP Wrapper\rdpwrap.dll	RDPWinst.exe
File opened for modification	\??\c:\program files\rdp wrapper\rdpwrap.txt	svchost.exe
File opened for modification	C:\Program Files\RDP Wrapper	smss.exe

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 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	smss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	smss.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

pid	Process
2644	schtasks.exe
2336	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4872	timeout.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000_Classes\MIME\Database	smss.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Charset	smss.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Codepage	smss.exe

NTFS ADS 3 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Local\Temp\sss\Install\WinMgmts:\	smss.exe
File opened for modification	C:\ProgramData\Setup\winmgmts:\	smss.exe
File opened for modification	C:\Users\Admin\AppData\Local\Temp\sss\Install\winmgmts:\	smss.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1788	winserv.exe
1788	winserv.exe
1788	winserv.exe
1788	winserv.exe
1788	winserv.exe
1788	winserv.exe
4932	winserv.exe
4932	winserv.exe
4932	winserv.exe
4932	winserv.exe
1084	svchost.exe
1084	svchost.exe
1084	svchost.exe
1084	svchost.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe
1124	smss.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
676	Process not Found

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	1788	winserv.exe
Token: SeTakeOwnershipPrivilege	4932	winserv.exe
Token: SeTcbPrivilege	4932	winserv.exe
Token: SeTcbPrivilege	4932	winserv.exe
Token: SeDebugPrivilege	2376	RDPWinst.exe
Token: SeAuditPrivilege	1084	svchost.exe

Suspicious use of SetWindowsHookEx 16 IoCs

pid	Process
1788	winserv.exe
1788	winserv.exe
1788	winserv.exe
1788	winserv.exe
4932	winserv.exe
4932	winserv.exe
4932	winserv.exe
4932	winserv.exe
3160	winserv.exe
3160	winserv.exe
3160	winserv.exe
3160	winserv.exe
4340	winserv.exe
4340	winserv.exe
4340	winserv.exe
4340	winserv.exe

Suspicious use of WriteProcessMemory 58 IoCs

description	pid	Process	procid_target
PID 1124 wrote to memory of 2644	1124	smss.exe	91
PID 1124 wrote to memory of 2644	1124	smss.exe	91
PID 1124 wrote to memory of 2336	1124	smss.exe	93
PID 1124 wrote to memory of 2336	1124	smss.exe	93
PID 1124 wrote to memory of 1788	1124	smss.exe	96
PID 1124 wrote to memory of 1788	1124	smss.exe	96
PID 1124 wrote to memory of 1788	1124	smss.exe	96
PID 1124 wrote to memory of 4804	1124	smss.exe	101
PID 1124 wrote to memory of 4804	1124	smss.exe	101
PID 4804 wrote to memory of 2964	4804	cmd.exe	103
PID 4804 wrote to memory of 2964	4804	cmd.exe	103
PID 2964 wrote to memory of 4988	2964	net.exe	104
PID 2964 wrote to memory of 4988	2964	net.exe	104
PID 1124 wrote to memory of 4128	1124	smss.exe	135
PID 1124 wrote to memory of 4128	1124	smss.exe	135
PID 4128 wrote to memory of 708	4128	cmd.exe	107
PID 4128 wrote to memory of 708	4128	cmd.exe	107
PID 1124 wrote to memory of 1504	1124	smss.exe	108
PID 1124 wrote to memory of 1504	1124	smss.exe	108
PID 708 wrote to memory of 2324	708	net.exe	109
PID 708 wrote to memory of 2324	708	net.exe	109
PID 1124 wrote to memory of 1728	1124	smss.exe	111
PID 1124 wrote to memory of 1728	1124	smss.exe	111
PID 1504 wrote to memory of 2312	1504	cmd.exe	112
PID 1504 wrote to memory of 2312	1504	cmd.exe	112
PID 2312 wrote to memory of 3224	2312	net.exe	114
PID 2312 wrote to memory of 3224	2312	net.exe	114
PID 1728 wrote to memory of 4312	1728	cmd.exe	115
PID 1728 wrote to memory of 4312	1728	cmd.exe	115
PID 1124 wrote to memory of 2580	1124	smss.exe	116
PID 1124 wrote to memory of 2580	1124	smss.exe	116
PID 4312 wrote to memory of 1804	4312	net.exe	118
PID 4312 wrote to memory of 1804	4312	net.exe	118
PID 2580 wrote to memory of 2512	2580	cmd.exe	119
PID 2580 wrote to memory of 2512	2580	cmd.exe	119
PID 2512 wrote to memory of 3380	2512	net.exe	120
PID 2512 wrote to memory of 3380	2512	net.exe	120
PID 1124 wrote to memory of 2540	1124	smss.exe	121
PID 1124 wrote to memory of 2540	1124	smss.exe	121
PID 2540 wrote to memory of 4340	2540	cmd.exe	123
PID 2540 wrote to memory of 4340	2540	cmd.exe	123
PID 4340 wrote to memory of 4472	4340	net.exe	124
PID 4340 wrote to memory of 4472	4340	net.exe	124
PID 1124 wrote to memory of 5008	1124	smss.exe	125
PID 1124 wrote to memory of 5008	1124	smss.exe	125
PID 5008 wrote to memory of 4540	5008	cmd.exe	127
PID 5008 wrote to memory of 4540	5008	cmd.exe	127
PID 4540 wrote to memory of 4496	4540	net.exe	128
PID 4540 wrote to memory of 4496	4540	net.exe	128
PID 1124 wrote to memory of 2376	1124	smss.exe	129
PID 1124 wrote to memory of 2376	1124	smss.exe	129
PID 1124 wrote to memory of 2376	1124	smss.exe	129
PID 2376 wrote to memory of 2508	2376	RDPWinst.exe	133
PID 2376 wrote to memory of 2508	2376	RDPWinst.exe	133
PID 1124 wrote to memory of 4128	1124	smss.exe	135
PID 1124 wrote to memory of 4128	1124	smss.exe	135
PID 4128 wrote to memory of 4872	4128	cmd.exe	137
PID 4128 wrote to memory of 4872	4128	cmd.exe	137

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\sss\Install\smss.exe
"C:\Users\Admin\AppData\Local\Temp\sss\Install\smss.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Checks processor information in registry
- Modifies registry class
- NTFS ADS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1124
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /TN "Microsoft\Windows\Wininet\winsers" /TR "\"C:\ProgramData\Windows Tasks Service\winserv.exe\" Task Service\winserv.exe" /SC MINUTE /MO 1 /RL HIGHEST
  2⤵
  - Creates scheduled task(s)
  PID:2644
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /TN "Microsoft\Windows\Wininet\winser" /TR "\"C:\ProgramData\Windows Tasks Service\winserv.exe\" Task Service\winserv.exe" /SC ONLOGON /RL HIGHEST
  2⤵
  - Creates scheduled task(s)
  PID:2336
- C:\ProgramData\Windows Tasks Service\winserv.exe
  "C:\ProgramData\Windows Tasks Service\winserv.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:1788
- - C:\ProgramData\Windows Tasks Service\winserv.exe
    "C:\ProgramData\Windows Tasks Service\winserv.exe" -second
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:4932
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net user John 12345 /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4804
- - C:\Windows\system32\net.exe
    net user John 12345 /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2964
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 user John 12345 /add
      4⤵
      PID:4988
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net localgroup "Администраторы" John /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4128
- - C:\Windows\system32\net.exe
    net localgroup "Администраторы" John /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:708
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 localgroup "Администраторы" John /add
      4⤵
      PID:2324
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net localgroup "Пользователи удаленного рабочего стола" John /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1504
- - C:\Windows\system32\net.exe
    net localgroup "Пользователи удаленного рабочего стола" John /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2312
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 localgroup "Пользователи удаленного рабочего стола" John /add
      4⤵
      PID:3224
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net localgroup "Пользователи удаленного управления" john /add" John /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1728
- - C:\Windows\system32\net.exe
    net localgroup "Пользователи удаленного управления" john /add" John /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4312
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 localgroup "Пользователи удаленного управления" john /add" John /add
      4⤵
      PID:1804
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net localgroup "Administrators" John /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2580
- - C:\Windows\system32\net.exe
    net localgroup "Administrators" John /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2512
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 localgroup "Administrators" John /add
      4⤵
      PID:3380
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net localgroup "Administradores" John /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2540
- - C:\Windows\system32\net.exe
    net localgroup "Administradores" John /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4340
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 localgroup "Administradores" John /add
      4⤵
      PID:4472
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c net localgroup "Remote Desktop Users" john /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5008
- - C:\Windows\system32\net.exe
    net localgroup "Remote Desktop Users" john /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4540
  - - C:\Windows\system32\net1.exe
      C:\Windows\system32\net1 localgroup "Remote Desktop Users" john /add
      4⤵
      PID:4496
- C:\ProgramData\RDPWinst.exe
  C:\ProgramData\RDPWinst.exe -i
  2⤵
  - Sets DLL path for service in the registry
  - Executes dropped EXE
  - Modifies WinLogon
  - Drops file in System32 directory
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2376
- - C:\Windows\SYSTEM32\netsh.exe
    netsh advfirewall firewall add rule name="Remote Desktop" dir=in protocol=tcp localport=3389 profile=any action=allow
    3⤵
    - Modifies Windows Firewall
    PID:2508
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Programdata\Install\del.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4128
- - C:\Windows\system32\timeout.exe
    timeout 5
    3⤵
    - Delays execution with timeout.exe
    PID:4872

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k NetworkService -s TermService
1⤵
PID:3464

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k NetworkService -s TermService
1⤵
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1084

C:\ProgramData\Windows Tasks Service\winserv.exe
"C:\ProgramData\Windows Tasks Service\winserv.exe" Task Service\winserv.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:3160

C:\ProgramData\Windows Tasks Service\winserv.exe
"C:\ProgramData\Windows Tasks Service\winserv.exe" Task Service\winserv.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:4340

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Account Manipulation

T1098

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

Privilege Escalation

Account Manipulation

T1098

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

System Information Discovery