remcos | 38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Executes dropped EXE 6 IoCs

pid	Process
2628	Dxpserver.exe
2736	Dxpserver.exe
908	Dxpserver.exe
2984	Dxpserver.exe
484	Dxpserver.exe
1260	Dxpserver.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Modifies WinLogon 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral1/files/0x00060000000191cf-19.dat	autoit_exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 1896 set thread context of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 2628 set thread context of 2736	2628	Dxpserver.exe	37
PID 908 set thread context of 2984	908	Dxpserver.exe	42
PID 484 set thread context of 1260	484	Dxpserver.exe	47

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 15 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

persistence execution

Scheduled Task

pid	Process
2732	schtasks.exe
2836	schtasks.exe
1856	schtasks.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 1896 wrote to memory of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 1896 wrote to memory of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 1896 wrote to memory of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 1896 wrote to memory of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 1896 wrote to memory of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 1896 wrote to memory of 2232	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	30
PID 2232 wrote to memory of 3016	2232	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	31
PID 2232 wrote to memory of 3016	2232	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	31
PID 2232 wrote to memory of 3016	2232	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	31
PID 2232 wrote to memory of 3016	2232	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	31
PID 1896 wrote to memory of 2732	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	33
PID 1896 wrote to memory of 2732	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	33
PID 1896 wrote to memory of 2732	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	33
PID 1896 wrote to memory of 2732	1896	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	33
PID 2636 wrote to memory of 2628	2636	taskeng.exe	36
PID 2636 wrote to memory of 2628	2636	taskeng.exe	36
PID 2636 wrote to memory of 2628	2636	taskeng.exe	36
PID 2636 wrote to memory of 2628	2636	taskeng.exe	36
PID 2628 wrote to memory of 2736	2628	Dxpserver.exe	37
PID 2628 wrote to memory of 2736	2628	Dxpserver.exe	37
PID 2628 wrote to memory of 2736	2628	Dxpserver.exe	37
PID 2628 wrote to memory of 2736	2628	Dxpserver.exe	37
PID 2628 wrote to memory of 2736	2628	Dxpserver.exe	37
PID 2628 wrote to memory of 2736	2628	Dxpserver.exe	37
PID 2736 wrote to memory of 2240	2736	Dxpserver.exe	38
PID 2736 wrote to memory of 2240	2736	Dxpserver.exe	38
PID 2736 wrote to memory of 2240	2736	Dxpserver.exe	38
PID 2736 wrote to memory of 2240	2736	Dxpserver.exe	38
PID 2628 wrote to memory of 2836	2628	Dxpserver.exe	39
PID 2628 wrote to memory of 2836	2628	Dxpserver.exe	39
PID 2628 wrote to memory of 2836	2628	Dxpserver.exe	39
PID 2628 wrote to memory of 2836	2628	Dxpserver.exe	39
PID 2636 wrote to memory of 908	2636	taskeng.exe	41
PID 2636 wrote to memory of 908	2636	taskeng.exe	41
PID 2636 wrote to memory of 908	2636	taskeng.exe	41
PID 2636 wrote to memory of 908	2636	taskeng.exe	41
PID 908 wrote to memory of 2984	908	Dxpserver.exe	42
PID 908 wrote to memory of 2984	908	Dxpserver.exe	42
PID 908 wrote to memory of 2984	908	Dxpserver.exe	42
PID 908 wrote to memory of 2984	908	Dxpserver.exe	42
PID 908 wrote to memory of 2984	908	Dxpserver.exe	42
PID 908 wrote to memory of 2984	908	Dxpserver.exe	42
PID 2984 wrote to memory of 2312	2984	Dxpserver.exe	43
PID 2984 wrote to memory of 2312	2984	Dxpserver.exe	43
PID 2984 wrote to memory of 2312	2984	Dxpserver.exe	43
PID 2984 wrote to memory of 2312	2984	Dxpserver.exe	43
PID 908 wrote to memory of 1856	908	Dxpserver.exe	44
PID 908 wrote to memory of 1856	908	Dxpserver.exe	44
PID 908 wrote to memory of 1856	908	Dxpserver.exe	44
PID 908 wrote to memory of 1856	908	Dxpserver.exe	44
PID 2636 wrote to memory of 484	2636	taskeng.exe	46
PID 2636 wrote to memory of 484	2636	taskeng.exe	46
PID 2636 wrote to memory of 484	2636	taskeng.exe	46
PID 2636 wrote to memory of 484	2636	taskeng.exe	46
PID 484 wrote to memory of 1260	484	Dxpserver.exe	47
PID 484 wrote to memory of 1260	484	Dxpserver.exe	47
PID 484 wrote to memory of 1260	484	Dxpserver.exe	47
PID 484 wrote to memory of 1260	484	Dxpserver.exe	47
PID 484 wrote to memory of 1260	484	Dxpserver.exe	47
PID 484 wrote to memory of 1260	484	Dxpserver.exe	47
PID 1260 wrote to memory of 788	1260	Dxpserver.exe	48
PID 1260 wrote to memory of 788	1260	Dxpserver.exe	48
PID 1260 wrote to memory of 788	1260	Dxpserver.exe	48
PID 1260 wrote to memory of 788	1260	Dxpserver.exe	48

C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
"C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1896
- C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
  "C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2232
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3016
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\SysWOW64\schtasks.exe" /create /tn cttunesvr /tr "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe" /sc minute /mo 1 /F
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2732

C:\Windows\system32\taskeng.exe
taskeng.exe {8EF065FB-029F-4269-A3CE-AD8D1E3E016E} S-1-5-21-3551809350-4263495960-1443967649-1000:NNYJZAHP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2636
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2628
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2736
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:2240
- - C:\Windows\SysWOW64\schtasks.exe
    "C:\Windows\SysWOW64\schtasks.exe" /create /tn cttunesvr /tr "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe" /sc minute /mo 1 /F
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2836
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:908
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2984
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:2312
- - C:\Windows\SysWOW64\schtasks.exe
    "C:\Windows\SysWOW64\schtasks.exe" /create /tn cttunesvr /tr "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe" /sc minute /mo 1 /F
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1856
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:484
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1260
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry