remcos | ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026

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\""	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.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
2504	Dxpserver.exe
2612	Dxpserver.exe
2956	Dxpserver.exe
396	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\""	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.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\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.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/0x0006000000018781-18.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2200 set thread context of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 2504 set thread context of 2612	2504	Dxpserver.exe	37
PID 2956 set thread context of 396	2956	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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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	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	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.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
2076	schtasks.exe
2860	schtasks.exe
1804	schtasks.exe

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 2200 wrote to memory of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 2200 wrote to memory of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 2200 wrote to memory of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 2200 wrote to memory of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 2200 wrote to memory of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 2200 wrote to memory of 1524	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	30
PID 1524 wrote to memory of 2372	1524	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	31
PID 1524 wrote to memory of 2372	1524	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	31
PID 1524 wrote to memory of 2372	1524	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	31
PID 1524 wrote to memory of 2372	1524	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	31
PID 2200 wrote to memory of 2860	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	33
PID 2200 wrote to memory of 2860	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	33
PID 2200 wrote to memory of 2860	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	33
PID 2200 wrote to memory of 2860	2200	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	33
PID 2896 wrote to memory of 2504	2896	taskeng.exe	36
PID 2896 wrote to memory of 2504	2896	taskeng.exe	36
PID 2896 wrote to memory of 2504	2896	taskeng.exe	36
PID 2896 wrote to memory of 2504	2896	taskeng.exe	36
PID 2504 wrote to memory of 2612	2504	Dxpserver.exe	37
PID 2504 wrote to memory of 2612	2504	Dxpserver.exe	37
PID 2504 wrote to memory of 2612	2504	Dxpserver.exe	37
PID 2504 wrote to memory of 2612	2504	Dxpserver.exe	37
PID 2504 wrote to memory of 2612	2504	Dxpserver.exe	37
PID 2504 wrote to memory of 2612	2504	Dxpserver.exe	37
PID 2612 wrote to memory of 2660	2612	Dxpserver.exe	38
PID 2612 wrote to memory of 2660	2612	Dxpserver.exe	38
PID 2612 wrote to memory of 2660	2612	Dxpserver.exe	38
PID 2612 wrote to memory of 2660	2612	Dxpserver.exe	38
PID 2504 wrote to memory of 1804	2504	Dxpserver.exe	39
PID 2504 wrote to memory of 1804	2504	Dxpserver.exe	39
PID 2504 wrote to memory of 1804	2504	Dxpserver.exe	39
PID 2504 wrote to memory of 1804	2504	Dxpserver.exe	39
PID 2896 wrote to memory of 2956	2896	taskeng.exe	41
PID 2896 wrote to memory of 2956	2896	taskeng.exe	41
PID 2896 wrote to memory of 2956	2896	taskeng.exe	41
PID 2896 wrote to memory of 2956	2896	taskeng.exe	41
PID 2956 wrote to memory of 396	2956	Dxpserver.exe	42
PID 2956 wrote to memory of 396	2956	Dxpserver.exe	42
PID 2956 wrote to memory of 396	2956	Dxpserver.exe	42
PID 2956 wrote to memory of 396	2956	Dxpserver.exe	42
PID 2956 wrote to memory of 396	2956	Dxpserver.exe	42
PID 2956 wrote to memory of 396	2956	Dxpserver.exe	42
PID 396 wrote to memory of 2960	396	Dxpserver.exe	43
PID 396 wrote to memory of 2960	396	Dxpserver.exe	43
PID 396 wrote to memory of 2960	396	Dxpserver.exe	43
PID 396 wrote to memory of 2960	396	Dxpserver.exe	43
PID 2956 wrote to memory of 2076	2956	Dxpserver.exe	44
PID 2956 wrote to memory of 2076	2956	Dxpserver.exe	44
PID 2956 wrote to memory of 2076	2956	Dxpserver.exe	44
PID 2956 wrote to memory of 2076	2956	Dxpserver.exe	44

C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
"C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2200
- C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
  "C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.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:1524
- - 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:2372
- 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:2860

C:\Windows\system32\taskeng.exe
taskeng.exe {B7734D59-F0C9-4427-BEAA-FDBBFAF3A982} S-1-5-21-4177215427-74451935-3209572229-1000:JSMURNPT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2896
- 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:2504
- - 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:2612
  - - 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:2660
- - 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:1804
- 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:2956
- - 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:396
  - - 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:2960
- - 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:2076

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