xpertrat | 2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17

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"	OPHAVSRETTEN.exe

Windows security bypass 2 TTPs 1 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	OPHAVSRETTEN.exe

XpertRAT
XpertRAT is a remote access trojan with various capabilities.
rat xpertrat

XpertRAT Core payload 3 IoCs

resource	yara_rule
behavioral1/memory/2948-23-0x0000000000400000-0x0000000000444000-memory.dmp	xpertrat
behavioral1/memory/2948-25-0x0000000000400000-0x0000000000444000-memory.dmp	xpertrat
behavioral1/memory/2948-36-0x0000000000400000-0x0000000000444000-memory.dmp	xpertrat

Xpertrat family
xpertrat

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	OPHAVSRETTEN.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5 = "C:\\Users\\Admin\\AppData\\Roaming\\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5\\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5.exe"	OPHAVSRETTEN.exe

Executes dropped EXE 3 IoCs

pid	Process
2740	OPHAVSRETTEN.exe
2728	OPHAVSRETTEN.exe
2948	OPHAVSRETTEN.exe

Loads dropped DLL 4 IoCs

pid	Process
2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe
2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe
2740	OPHAVSRETTEN.exe
2728	OPHAVSRETTEN.exe

Windows security modification 2 TTPs 1 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	OPHAVSRETTEN.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5 = "C:\\Users\\Admin\\AppData\\Roaming\\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5\\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5.exe"	OPHAVSRETTEN.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5 = "C:\\Users\\Admin\\AppData\\Roaming\\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5\\P4U8M5X3-N0E7-O7S5-B1Y3-J7Q6J4S0G6G5.exe"	OPHAVSRETTEN.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

System Information Discovery

T1082

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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2740 set thread context of 2728	2740	OPHAVSRETTEN.exe	30
PID 2728 set thread context of 2948	2728	OPHAVSRETTEN.exe	31

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	OPHAVSRETTEN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	OPHAVSRETTEN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	OPHAVSRETTEN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mshta.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Internet Explorer\Main	mshta.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2728	OPHAVSRETTEN.exe
2728	OPHAVSRETTEN.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2948	OPHAVSRETTEN.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe
2740	OPHAVSRETTEN.exe
2728	OPHAVSRETTEN.exe
2948	OPHAVSRETTEN.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2920 wrote to memory of 2600	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	28
PID 2920 wrote to memory of 2600	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	28
PID 2920 wrote to memory of 2600	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	28
PID 2920 wrote to memory of 2600	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	28
PID 2920 wrote to memory of 2740	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	29
PID 2920 wrote to memory of 2740	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	29
PID 2920 wrote to memory of 2740	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	29
PID 2920 wrote to memory of 2740	2920	2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe	29
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2740 wrote to memory of 2728	2740	OPHAVSRETTEN.exe	30
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31
PID 2728 wrote to memory of 2948	2728	OPHAVSRETTEN.exe	31

System policy modification 1 TTPs 1 IoCs

defense_evasion

Modify Registry

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

C:\Users\Admin\AppData\Local\Temp\2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe
"C:\Users\Admin\AppData\Local\Temp\2235ed553b50f5923d2594bf1d7a4fbc175ddf3e498b4aab995dfb289b775f17.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2920
- C:\Windows\SysWOW64\mshta.exe
  "C:\Windows\System32\mshta.exe" vbscript:Execute(" str1 = ""WScript.Shell"" : str2 = ""Set WshShell = CrXXteObject(str1)"" : str2 = Replace(str2,""XX"",""ea"") : execute str2 : myKey = ""HKCU\Software\Microsoft\Windows\:\Run\sprgekasser"" : myKey = ""HKCU\Software\Microsoft\Windows\X\Run\NOME"" : myKey=replace(myKey,"":"",""CurrentVersion"") : WshShell.RegWrite myKey,""C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe"",""REG_SZ"" : window.close")
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies Internet Explorer settings
  PID:2600
- C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe
  "C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2740
- - C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe
    "C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe"
    3⤵
    - UAC bypass
    - Windows security bypass
    - Executes dropped EXE
    - Loads dropped DLL
    - Windows security modification
    - Checks whether UAC is enabled
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    - System policy modification
    PID:2728
  - - C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe
      C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe
      4⤵
      Adds policy Run key to start application
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:2948

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry