remcos | 37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8

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\""	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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
1140	Dxpserver.exe
1076	Dxpserver.exe
1816	Dxpserver.exe
2004	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-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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 3 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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/0x0008000000016cd7-19.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2184 set thread context of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 1140 set thread context of 1076	1140	Dxpserver.exe	37
PID 1816 set thread context of 2004	1816	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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
2888	schtasks.exe
2456	schtasks.exe
580	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 2184 wrote to memory of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 2184 wrote to memory of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 2184 wrote to memory of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 2184 wrote to memory of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 2184 wrote to memory of 2108	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	30
PID 2108 wrote to memory of 1284	2108	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	31
PID 2108 wrote to memory of 1284	2108	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	31
PID 2108 wrote to memory of 1284	2108	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	31
PID 2108 wrote to memory of 1284	2108	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	31
PID 2184 wrote to memory of 2888	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	32
PID 2184 wrote to memory of 2888	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	32
PID 2184 wrote to memory of 2888	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	32
PID 2184 wrote to memory of 2888	2184	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	32
PID 1252 wrote to memory of 1140	1252	taskeng.exe	36
PID 1252 wrote to memory of 1140	1252	taskeng.exe	36
PID 1252 wrote to memory of 1140	1252	taskeng.exe	36
PID 1252 wrote to memory of 1140	1252	taskeng.exe	36
PID 1140 wrote to memory of 1076	1140	Dxpserver.exe	37
PID 1140 wrote to memory of 1076	1140	Dxpserver.exe	37
PID 1140 wrote to memory of 1076	1140	Dxpserver.exe	37
PID 1140 wrote to memory of 1076	1140	Dxpserver.exe	37
PID 1140 wrote to memory of 1076	1140	Dxpserver.exe	37
PID 1140 wrote to memory of 1076	1140	Dxpserver.exe	37
PID 1076 wrote to memory of 644	1076	Dxpserver.exe	38
PID 1076 wrote to memory of 644	1076	Dxpserver.exe	38
PID 1076 wrote to memory of 644	1076	Dxpserver.exe	38
PID 1076 wrote to memory of 644	1076	Dxpserver.exe	38
PID 1140 wrote to memory of 2456	1140	Dxpserver.exe	39
PID 1140 wrote to memory of 2456	1140	Dxpserver.exe	39
PID 1140 wrote to memory of 2456	1140	Dxpserver.exe	39
PID 1140 wrote to memory of 2456	1140	Dxpserver.exe	39
PID 1252 wrote to memory of 1816	1252	taskeng.exe	41
PID 1252 wrote to memory of 1816	1252	taskeng.exe	41
PID 1252 wrote to memory of 1816	1252	taskeng.exe	41
PID 1252 wrote to memory of 1816	1252	taskeng.exe	41
PID 1816 wrote to memory of 2004	1816	Dxpserver.exe	42
PID 1816 wrote to memory of 2004	1816	Dxpserver.exe	42
PID 1816 wrote to memory of 2004	1816	Dxpserver.exe	42
PID 1816 wrote to memory of 2004	1816	Dxpserver.exe	42
PID 1816 wrote to memory of 2004	1816	Dxpserver.exe	42
PID 1816 wrote to memory of 2004	1816	Dxpserver.exe	42
PID 2004 wrote to memory of 2496	2004	Dxpserver.exe	43
PID 2004 wrote to memory of 2496	2004	Dxpserver.exe	43
PID 2004 wrote to memory of 2496	2004	Dxpserver.exe	43
PID 2004 wrote to memory of 2496	2004	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe
"C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2184
- C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe
  "C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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:2108
- - 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:1284
- 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:2888

C:\Windows\system32\taskeng.exe
taskeng.exe {D532ACC5-8170-405F-971B-EE3831FD7E1E} S-1-5-21-3551809350-4263495960-1443967649-1000:NNYJZAHP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1252
- 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:1140
- - 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:1076
  - - 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:644
- - 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:2456
- 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:1816
- - 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:2004
  - - 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:2496
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:580

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