remcos | 8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4

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\""	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.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
2824	Dxpserver.exe
2832	Dxpserver.exe
840	Dxpserver.exe
836	Dxpserver.exe
1696	Dxpserver.exe
1472	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-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\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\	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.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/0x0007000000015ec4-19.dat	autoit_exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2124 set thread context of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2824 set thread context of 2832	2824	Dxpserver.exe	37
PID 840 set thread context of 836	840	Dxpserver.exe	42
PID 1696 set thread context of 1472	1696	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	WScript.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	Dxpserver.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	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.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
2816	schtasks.exe
2016	schtasks.exe
2200	schtasks.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2124 wrote to memory of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2124 wrote to memory of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2124 wrote to memory of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2124 wrote to memory of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2124 wrote to memory of 2384	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	30
PID 2384 wrote to memory of 1188	2384	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	31
PID 2384 wrote to memory of 1188	2384	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	31
PID 2384 wrote to memory of 1188	2384	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	31
PID 2384 wrote to memory of 1188	2384	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	31
PID 2124 wrote to memory of 2816	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	33
PID 2124 wrote to memory of 2816	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	33
PID 2124 wrote to memory of 2816	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	33
PID 2124 wrote to memory of 2816	2124	8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe	33
PID 2940 wrote to memory of 2824	2940	taskeng.exe	36
PID 2940 wrote to memory of 2824	2940	taskeng.exe	36
PID 2940 wrote to memory of 2824	2940	taskeng.exe	36
PID 2940 wrote to memory of 2824	2940	taskeng.exe	36
PID 2824 wrote to memory of 2832	2824	Dxpserver.exe	37
PID 2824 wrote to memory of 2832	2824	Dxpserver.exe	37
PID 2824 wrote to memory of 2832	2824	Dxpserver.exe	37
PID 2824 wrote to memory of 2832	2824	Dxpserver.exe	37
PID 2824 wrote to memory of 2832	2824	Dxpserver.exe	37
PID 2824 wrote to memory of 2832	2824	Dxpserver.exe	37
PID 2832 wrote to memory of 2204	2832	Dxpserver.exe	38
PID 2832 wrote to memory of 2204	2832	Dxpserver.exe	38
PID 2832 wrote to memory of 2204	2832	Dxpserver.exe	38
PID 2832 wrote to memory of 2204	2832	Dxpserver.exe	38
PID 2824 wrote to memory of 2016	2824	Dxpserver.exe	39
PID 2824 wrote to memory of 2016	2824	Dxpserver.exe	39
PID 2824 wrote to memory of 2016	2824	Dxpserver.exe	39
PID 2824 wrote to memory of 2016	2824	Dxpserver.exe	39
PID 2940 wrote to memory of 840	2940	taskeng.exe	41
PID 2940 wrote to memory of 840	2940	taskeng.exe	41
PID 2940 wrote to memory of 840	2940	taskeng.exe	41
PID 2940 wrote to memory of 840	2940	taskeng.exe	41
PID 840 wrote to memory of 836	840	Dxpserver.exe	42
PID 840 wrote to memory of 836	840	Dxpserver.exe	42
PID 840 wrote to memory of 836	840	Dxpserver.exe	42
PID 840 wrote to memory of 836	840	Dxpserver.exe	42
PID 840 wrote to memory of 836	840	Dxpserver.exe	42
PID 840 wrote to memory of 836	840	Dxpserver.exe	42
PID 836 wrote to memory of 2836	836	Dxpserver.exe	43
PID 836 wrote to memory of 2836	836	Dxpserver.exe	43
PID 836 wrote to memory of 2836	836	Dxpserver.exe	43
PID 836 wrote to memory of 2836	836	Dxpserver.exe	43
PID 840 wrote to memory of 2200	840	Dxpserver.exe	44
PID 840 wrote to memory of 2200	840	Dxpserver.exe	44
PID 840 wrote to memory of 2200	840	Dxpserver.exe	44
PID 840 wrote to memory of 2200	840	Dxpserver.exe	44
PID 2940 wrote to memory of 1696	2940	taskeng.exe	46
PID 2940 wrote to memory of 1696	2940	taskeng.exe	46
PID 2940 wrote to memory of 1696	2940	taskeng.exe	46
PID 2940 wrote to memory of 1696	2940	taskeng.exe	46
PID 1696 wrote to memory of 1472	1696	Dxpserver.exe	47
PID 1696 wrote to memory of 1472	1696	Dxpserver.exe	47
PID 1696 wrote to memory of 1472	1696	Dxpserver.exe	47
PID 1696 wrote to memory of 1472	1696	Dxpserver.exe	47
PID 1696 wrote to memory of 1472	1696	Dxpserver.exe	47
PID 1696 wrote to memory of 1472	1696	Dxpserver.exe	47
PID 1472 wrote to memory of 2180	1472	Dxpserver.exe	48
PID 1472 wrote to memory of 2180	1472	Dxpserver.exe	48
PID 1472 wrote to memory of 2180	1472	Dxpserver.exe	48
PID 1472 wrote to memory of 2180	1472	Dxpserver.exe	48

C:\Users\Admin\AppData\Local\Temp\8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe
"C:\Users\Admin\AppData\Local\Temp\8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2124
- C:\Users\Admin\AppData\Local\Temp\8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.exe
  "C:\Users\Admin\AppData\Local\Temp\8af9d7defd1b6c8bf8ebc0fa6833f13f02cd94c9e55697b3fb4189fe895090f4.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:2384
- - 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:1188
- 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:2816

C:\Windows\system32\taskeng.exe
taskeng.exe {BAB6FB58-6EC4-476C-ADFB-D7DE4389B916} S-1-5-21-1163522206-1469769407-485553996-1000:PJCSDMRP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2940
- 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:2824
- - 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:2832
  - - 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:2204
- - 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:2016
- 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:840
- - 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:836
  - - 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:2836
- - 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:2200
- 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:1696
- - 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:1472
  - - 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:2180

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