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\""	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\""	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe

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

Checks computer location settings 2 TTPs 6 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Dxpserver.exe

Executes dropped EXE 4 IoCs

pid	Process
4968	Dxpserver.exe
4960	Dxpserver.exe
1784	Dxpserver.exe
640	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-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\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\	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.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
behavioral2/files/0x0009000000023bc9-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2552 set thread context of 5028	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	82
PID 4968 set thread context of 4960	4968	Dxpserver.exe	87
PID 1784 set thread context of 640	1784	Dxpserver.exe	101

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

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	Dxpserver.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
4312	schtasks.exe
3548	schtasks.exe
552	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 2552 wrote to memory of 5028	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	82
PID 2552 wrote to memory of 5028	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	82
PID 2552 wrote to memory of 5028	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	82
PID 2552 wrote to memory of 5028	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	82
PID 2552 wrote to memory of 5028	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	82
PID 5028 wrote to memory of 4932	5028	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	83
PID 5028 wrote to memory of 4932	5028	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	83
PID 5028 wrote to memory of 4932	5028	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	83
PID 2552 wrote to memory of 4312	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	84
PID 2552 wrote to memory of 4312	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	84
PID 2552 wrote to memory of 4312	2552	ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe	84
PID 4968 wrote to memory of 4960	4968	Dxpserver.exe	87
PID 4968 wrote to memory of 4960	4968	Dxpserver.exe	87
PID 4968 wrote to memory of 4960	4968	Dxpserver.exe	87
PID 4968 wrote to memory of 4960	4968	Dxpserver.exe	87
PID 4968 wrote to memory of 4960	4968	Dxpserver.exe	87
PID 4960 wrote to memory of 1548	4960	Dxpserver.exe	88
PID 4960 wrote to memory of 1548	4960	Dxpserver.exe	88
PID 4960 wrote to memory of 1548	4960	Dxpserver.exe	88
PID 4968 wrote to memory of 3548	4968	Dxpserver.exe	91
PID 4968 wrote to memory of 3548	4968	Dxpserver.exe	91
PID 4968 wrote to memory of 3548	4968	Dxpserver.exe	91
PID 1784 wrote to memory of 640	1784	Dxpserver.exe	101
PID 1784 wrote to memory of 640	1784	Dxpserver.exe	101
PID 1784 wrote to memory of 640	1784	Dxpserver.exe	101
PID 1784 wrote to memory of 640	1784	Dxpserver.exe	101
PID 1784 wrote to memory of 640	1784	Dxpserver.exe	101
PID 640 wrote to memory of 4400	640	Dxpserver.exe	102
PID 640 wrote to memory of 4400	640	Dxpserver.exe	102
PID 640 wrote to memory of 4400	640	Dxpserver.exe	102
PID 1784 wrote to memory of 552	1784	Dxpserver.exe	103
PID 1784 wrote to memory of 552	1784	Dxpserver.exe	103
PID 1784 wrote to memory of 552	1784	Dxpserver.exe	103

C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
"C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2552
- C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe
  "C:\Users\Admin\AppData\Local\Temp\ba31aec6944cb10bc7fc3c2c684f430a1e94177e91a10a9be63d70e52d818026.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:5028
- - 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:4932
- 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:4312

C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4968
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4960
- - 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:1548
- 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:3548

C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1784
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:640
- - 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:4400
- 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:552

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