remcos | 38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53

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\""	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe

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

Checks computer location settings 2 TTPs 5 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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe

Executes dropped EXE 4 IoCs

pid	Process
2616	Dxpserver.exe
1460	Dxpserver.exe
2068	Dxpserver.exe
4100	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-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\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\	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.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/0x0007000000023cb3-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1180 set thread context of 1440	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	83
PID 2616 set thread context of 1460	2616	Dxpserver.exe	104
PID 2068 set thread context of 4100	2068	Dxpserver.exe	110

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	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.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	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.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

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	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
1688	schtasks.exe
4496	schtasks.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1180 wrote to memory of 1440	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	83
PID 1180 wrote to memory of 1440	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	83
PID 1180 wrote to memory of 1440	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	83
PID 1180 wrote to memory of 1440	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	83
PID 1180 wrote to memory of 1440	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	83
PID 1440 wrote to memory of 4432	1440	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	84
PID 1440 wrote to memory of 4432	1440	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	84
PID 1440 wrote to memory of 4432	1440	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	84
PID 1180 wrote to memory of 1688	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	98
PID 1180 wrote to memory of 1688	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	98
PID 1180 wrote to memory of 1688	1180	38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe	98
PID 2616 wrote to memory of 1460	2616	Dxpserver.exe	104
PID 2616 wrote to memory of 1460	2616	Dxpserver.exe	104
PID 2616 wrote to memory of 1460	2616	Dxpserver.exe	104
PID 2616 wrote to memory of 1460	2616	Dxpserver.exe	104
PID 2616 wrote to memory of 1460	2616	Dxpserver.exe	104
PID 1460 wrote to memory of 3832	1460	Dxpserver.exe	105
PID 1460 wrote to memory of 3832	1460	Dxpserver.exe	105
PID 1460 wrote to memory of 3832	1460	Dxpserver.exe	105
PID 2616 wrote to memory of 4496	2616	Dxpserver.exe	107
PID 2616 wrote to memory of 4496	2616	Dxpserver.exe	107
PID 2616 wrote to memory of 4496	2616	Dxpserver.exe	107
PID 2068 wrote to memory of 4100	2068	Dxpserver.exe	110
PID 2068 wrote to memory of 4100	2068	Dxpserver.exe	110
PID 2068 wrote to memory of 4100	2068	Dxpserver.exe	110
PID 2068 wrote to memory of 4100	2068	Dxpserver.exe	110
PID 2068 wrote to memory of 4100	2068	Dxpserver.exe	110
PID 4100 wrote to memory of 812	4100	Dxpserver.exe	111
PID 4100 wrote to memory of 812	4100	Dxpserver.exe	111
PID 4100 wrote to memory of 812	4100	Dxpserver.exe	111

C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
"C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1180
- C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.exe
  "C:\Users\Admin\AppData\Local\Temp\38052ddd9c64e44bd2631ae021c1e973bed0ddfc8be6c3b2714011647c551d53.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:1440
- - 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:4432
- 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:1688

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:2616
- 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:1460
- - 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:3832
- 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:4496

C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2068
- 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:4100
- - 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:812

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