remcos | bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203c

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\""	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.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 4 IoCs

pid	Process
1880	Dxpserver.exe
2408	Dxpserver.exe
2516	Dxpserver.exe
2488	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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\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\	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.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/0x00060000000186b7-19.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2776 set thread context of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 1880 set thread context of 2408	1880	Dxpserver.exe	36
PID 2516 set thread context of 2488	2516	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	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	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.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

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
2712	schtasks.exe
676	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2776 wrote to memory of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 2776 wrote to memory of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 2776 wrote to memory of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 2776 wrote to memory of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 2776 wrote to memory of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 2776 wrote to memory of 2872	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	30
PID 2872 wrote to memory of 2704	2872	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	31
PID 2872 wrote to memory of 2704	2872	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	31
PID 2872 wrote to memory of 2704	2872	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	31
PID 2872 wrote to memory of 2704	2872	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	31
PID 2776 wrote to memory of 2712	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	32
PID 2776 wrote to memory of 2712	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	32
PID 2776 wrote to memory of 2712	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	32
PID 2776 wrote to memory of 2712	2776	bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe	32
PID 1384 wrote to memory of 1880	1384	taskeng.exe	35
PID 1384 wrote to memory of 1880	1384	taskeng.exe	35
PID 1384 wrote to memory of 1880	1384	taskeng.exe	35
PID 1384 wrote to memory of 1880	1384	taskeng.exe	35
PID 1880 wrote to memory of 2408	1880	Dxpserver.exe	36
PID 1880 wrote to memory of 2408	1880	Dxpserver.exe	36
PID 1880 wrote to memory of 2408	1880	Dxpserver.exe	36
PID 1880 wrote to memory of 2408	1880	Dxpserver.exe	36
PID 1880 wrote to memory of 2408	1880	Dxpserver.exe	36
PID 1880 wrote to memory of 2408	1880	Dxpserver.exe	36
PID 2408 wrote to memory of 2736	2408	Dxpserver.exe	37
PID 2408 wrote to memory of 2736	2408	Dxpserver.exe	37
PID 2408 wrote to memory of 2736	2408	Dxpserver.exe	37
PID 2408 wrote to memory of 2736	2408	Dxpserver.exe	37
PID 1880 wrote to memory of 676	1880	Dxpserver.exe	39
PID 1880 wrote to memory of 676	1880	Dxpserver.exe	39
PID 1880 wrote to memory of 676	1880	Dxpserver.exe	39
PID 1880 wrote to memory of 676	1880	Dxpserver.exe	39
PID 1384 wrote to memory of 2516	1384	taskeng.exe	41
PID 1384 wrote to memory of 2516	1384	taskeng.exe	41
PID 1384 wrote to memory of 2516	1384	taskeng.exe	41
PID 1384 wrote to memory of 2516	1384	taskeng.exe	41
PID 2516 wrote to memory of 2488	2516	Dxpserver.exe	42
PID 2516 wrote to memory of 2488	2516	Dxpserver.exe	42
PID 2516 wrote to memory of 2488	2516	Dxpserver.exe	42
PID 2516 wrote to memory of 2488	2516	Dxpserver.exe	42
PID 2516 wrote to memory of 2488	2516	Dxpserver.exe	42
PID 2516 wrote to memory of 2488	2516	Dxpserver.exe	42
PID 2488 wrote to memory of 2444	2488	Dxpserver.exe	43
PID 2488 wrote to memory of 2444	2488	Dxpserver.exe	43
PID 2488 wrote to memory of 2444	2488	Dxpserver.exe	43
PID 2488 wrote to memory of 2444	2488	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe
"C:\Users\Admin\AppData\Local\Temp\bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2776
- C:\Users\Admin\AppData\Local\Temp\bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.exe
  "C:\Users\Admin\AppData\Local\Temp\bc45778b6b190ec52e270546b79c777086998534581316bfcb037ec1d523203cN.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:2872
- - 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:2704
- 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:2712

C:\Windows\system32\taskeng.exe
taskeng.exe {CB009B72-3468-4123-94D4-C97FB2AA04D0} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1384
- 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:1880
- - 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:2408
  - - 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:2736
- - 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:676
- 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:2516
- - 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:2488
  - - 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:2444

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