remcos | f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3

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\""	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\""	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe

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

Executes dropped EXE 4 IoCs

pid	Process
2608	Dxpserver.exe
2636	Dxpserver.exe
2644	Dxpserver.exe
2432	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-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\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\	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.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 2 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral1/files/0x0007000000019056-19.dat	autoit_exe
behavioral1/files/0x0008000000018be7-32.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1984 set thread context of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 2608 set thread context of 2636	2608	Dxpserver.exe	37
PID 2644 set thread context of 2432	2644	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 12 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	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	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.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	Dxpserver.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	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
2728	schtasks.exe
2500	schtasks.exe
1096	schtasks.exe

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 1984 wrote to memory of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 1984 wrote to memory of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 1984 wrote to memory of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 1984 wrote to memory of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 1984 wrote to memory of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 1984 wrote to memory of 2380	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	30
PID 2380 wrote to memory of 2144	2380	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	31
PID 2380 wrote to memory of 2144	2380	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	31
PID 2380 wrote to memory of 2144	2380	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	31
PID 2380 wrote to memory of 2144	2380	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	31
PID 1984 wrote to memory of 2728	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	33
PID 1984 wrote to memory of 2728	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	33
PID 1984 wrote to memory of 2728	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	33
PID 1984 wrote to memory of 2728	1984	f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe	33
PID 2768 wrote to memory of 2608	2768	taskeng.exe	36
PID 2768 wrote to memory of 2608	2768	taskeng.exe	36
PID 2768 wrote to memory of 2608	2768	taskeng.exe	36
PID 2768 wrote to memory of 2608	2768	taskeng.exe	36
PID 2608 wrote to memory of 2636	2608	Dxpserver.exe	37
PID 2608 wrote to memory of 2636	2608	Dxpserver.exe	37
PID 2608 wrote to memory of 2636	2608	Dxpserver.exe	37
PID 2608 wrote to memory of 2636	2608	Dxpserver.exe	37
PID 2608 wrote to memory of 2636	2608	Dxpserver.exe	37
PID 2608 wrote to memory of 2636	2608	Dxpserver.exe	37
PID 2636 wrote to memory of 1608	2636	Dxpserver.exe	38
PID 2636 wrote to memory of 1608	2636	Dxpserver.exe	38
PID 2636 wrote to memory of 1608	2636	Dxpserver.exe	38
PID 2636 wrote to memory of 1608	2636	Dxpserver.exe	38
PID 2608 wrote to memory of 2500	2608	Dxpserver.exe	39
PID 2608 wrote to memory of 2500	2608	Dxpserver.exe	39
PID 2608 wrote to memory of 2500	2608	Dxpserver.exe	39
PID 2608 wrote to memory of 2500	2608	Dxpserver.exe	39
PID 2768 wrote to memory of 2644	2768	taskeng.exe	41
PID 2768 wrote to memory of 2644	2768	taskeng.exe	41
PID 2768 wrote to memory of 2644	2768	taskeng.exe	41
PID 2768 wrote to memory of 2644	2768	taskeng.exe	41
PID 2644 wrote to memory of 2432	2644	Dxpserver.exe	42
PID 2644 wrote to memory of 2432	2644	Dxpserver.exe	42
PID 2644 wrote to memory of 2432	2644	Dxpserver.exe	42
PID 2644 wrote to memory of 2432	2644	Dxpserver.exe	42
PID 2644 wrote to memory of 2432	2644	Dxpserver.exe	42
PID 2644 wrote to memory of 2432	2644	Dxpserver.exe	42
PID 2432 wrote to memory of 2396	2432	Dxpserver.exe	43
PID 2432 wrote to memory of 2396	2432	Dxpserver.exe	43
PID 2432 wrote to memory of 2396	2432	Dxpserver.exe	43
PID 2432 wrote to memory of 2396	2432	Dxpserver.exe	43
PID 2644 wrote to memory of 1096	2644	Dxpserver.exe	44
PID 2644 wrote to memory of 1096	2644	Dxpserver.exe	44
PID 2644 wrote to memory of 1096	2644	Dxpserver.exe	44
PID 2644 wrote to memory of 1096	2644	Dxpserver.exe	44

C:\Users\Admin\AppData\Local\Temp\f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe
"C:\Users\Admin\AppData\Local\Temp\f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1984
- C:\Users\Admin\AppData\Local\Temp\f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.exe
  "C:\Users\Admin\AppData\Local\Temp\f1dbc931465ea70bf2a8fba0b6fc1432ac95dc26b71b307fcaaf4375265869a3N.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:2380
- - 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:2144
- 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:2728

C:\Windows\system32\taskeng.exe
taskeng.exe {D656F68F-C3A3-418E-96D9-2D1ABAB8451B} S-1-5-21-3063565911-2056067323-3330884624-1000:KHBTHJFA\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2768
- 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:2608
- - 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:2636
  - - 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:1608
- - 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:2500
- 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:2644
- - 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:2432
  - - 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:2396
- - 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:1096

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