remcos | 1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85

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\""	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\""	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.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 4 IoCs

pid	Process
2856	Dxpserver.exe
2600	Dxpserver.exe
2260	Dxpserver.exe
3028	Dxpserver.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Modifies WinLogon 2 TTPs 3 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.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/0x0008000000016c73-19.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2116 set thread context of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2856 set thread context of 2600	2856	Dxpserver.exe	37
PID 2260 set thread context of 3028	2260	Dxpserver.exe	42

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 11 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.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	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

pid	Process
2740	schtasks.exe
1420	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2116 wrote to memory of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2116 wrote to memory of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2116 wrote to memory of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2116 wrote to memory of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2116 wrote to memory of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2116 wrote to memory of 2112	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	30
PID 2112 wrote to memory of 2500	2112	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	31
PID 2112 wrote to memory of 2500	2112	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	31
PID 2112 wrote to memory of 2500	2112	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	31
PID 2112 wrote to memory of 2500	2112	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	31
PID 2116 wrote to memory of 2740	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	33
PID 2116 wrote to memory of 2740	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	33
PID 2116 wrote to memory of 2740	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	33
PID 2116 wrote to memory of 2740	2116	1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe	33
PID 2012 wrote to memory of 2856	2012	taskeng.exe	36
PID 2012 wrote to memory of 2856	2012	taskeng.exe	36
PID 2012 wrote to memory of 2856	2012	taskeng.exe	36
PID 2012 wrote to memory of 2856	2012	taskeng.exe	36
PID 2856 wrote to memory of 2600	2856	Dxpserver.exe	37
PID 2856 wrote to memory of 2600	2856	Dxpserver.exe	37
PID 2856 wrote to memory of 2600	2856	Dxpserver.exe	37
PID 2856 wrote to memory of 2600	2856	Dxpserver.exe	37
PID 2856 wrote to memory of 2600	2856	Dxpserver.exe	37
PID 2856 wrote to memory of 2600	2856	Dxpserver.exe	37
PID 2600 wrote to memory of 1036	2600	Dxpserver.exe	38
PID 2600 wrote to memory of 1036	2600	Dxpserver.exe	38
PID 2600 wrote to memory of 1036	2600	Dxpserver.exe	38
PID 2600 wrote to memory of 1036	2600	Dxpserver.exe	38
PID 2856 wrote to memory of 1420	2856	Dxpserver.exe	39
PID 2856 wrote to memory of 1420	2856	Dxpserver.exe	39
PID 2856 wrote to memory of 1420	2856	Dxpserver.exe	39
PID 2856 wrote to memory of 1420	2856	Dxpserver.exe	39
PID 2012 wrote to memory of 2260	2012	taskeng.exe	41
PID 2012 wrote to memory of 2260	2012	taskeng.exe	41
PID 2012 wrote to memory of 2260	2012	taskeng.exe	41
PID 2012 wrote to memory of 2260	2012	taskeng.exe	41
PID 2260 wrote to memory of 3028	2260	Dxpserver.exe	42
PID 2260 wrote to memory of 3028	2260	Dxpserver.exe	42
PID 2260 wrote to memory of 3028	2260	Dxpserver.exe	42
PID 2260 wrote to memory of 3028	2260	Dxpserver.exe	42
PID 2260 wrote to memory of 3028	2260	Dxpserver.exe	42
PID 2260 wrote to memory of 3028	2260	Dxpserver.exe	42
PID 3028 wrote to memory of 556	3028	Dxpserver.exe	43
PID 3028 wrote to memory of 556	3028	Dxpserver.exe	43
PID 3028 wrote to memory of 556	3028	Dxpserver.exe	43
PID 3028 wrote to memory of 556	3028	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe
"C:\Users\Admin\AppData\Local\Temp\1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2116
- C:\Users\Admin\AppData\Local\Temp\1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.exe
  "C:\Users\Admin\AppData\Local\Temp\1cb8654ce731b738af7171cdc3cbdf12db8448848989c27f41e3d6169a761b85.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:2112
- - 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:2500
- 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:2740

C:\Windows\system32\taskeng.exe
taskeng.exe {418BCF64-D0EE-474E-9242-777949B4BF0E} S-1-5-21-4177215427-74451935-3209572229-1000:JSMURNPT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2012
- 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:2856
- - 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:2600
  - - 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:1036
- - 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:1420
- 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:2260
- - 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:3028
  - - 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:556

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