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

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-1-5-21-4174397412-4125106315-2776226590-1000\Control Panel\International\Geo\Nation	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000\Control Panel\International\Geo\Nation	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe

Executes dropped EXE 4 IoCs

pid	Process
2516	Dxpserver.exe
2924	Dxpserver.exe
2056	Dxpserver.exe
2984	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-1-5-21-4174397412-4125106315-2776226590-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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
behavioral2/files/0x0008000000023c51-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3452 set thread context of 3704	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	84
PID 2516 set thread context of 2924	2516	Dxpserver.exe	94
PID 2056 set thread context of 2984	2056	Dxpserver.exe	99

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	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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	schtasks.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	WScript.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-1-5-21-4174397412-4125106315-2776226590-1000_Classes\Local Settings	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe
Key created	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-4174397412-4125106315-2776226590-1000_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
1592	schtasks.exe
4532	schtasks.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3452 wrote to memory of 3704	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	84
PID 3452 wrote to memory of 3704	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	84
PID 3452 wrote to memory of 3704	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	84
PID 3452 wrote to memory of 3704	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	84
PID 3452 wrote to memory of 3704	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	84
PID 3704 wrote to memory of 392	3704	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	86
PID 3704 wrote to memory of 392	3704	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	86
PID 3704 wrote to memory of 392	3704	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	86
PID 3452 wrote to memory of 1592	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	87
PID 3452 wrote to memory of 1592	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	87
PID 3452 wrote to memory of 1592	3452	37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe	87
PID 2516 wrote to memory of 2924	2516	Dxpserver.exe	94
PID 2516 wrote to memory of 2924	2516	Dxpserver.exe	94
PID 2516 wrote to memory of 2924	2516	Dxpserver.exe	94
PID 2516 wrote to memory of 2924	2516	Dxpserver.exe	94
PID 2516 wrote to memory of 2924	2516	Dxpserver.exe	94
PID 2924 wrote to memory of 4280	2924	Dxpserver.exe	95
PID 2924 wrote to memory of 4280	2924	Dxpserver.exe	95
PID 2924 wrote to memory of 4280	2924	Dxpserver.exe	95
PID 2516 wrote to memory of 4532	2516	Dxpserver.exe	96
PID 2516 wrote to memory of 4532	2516	Dxpserver.exe	96
PID 2516 wrote to memory of 4532	2516	Dxpserver.exe	96
PID 2056 wrote to memory of 2984	2056	Dxpserver.exe	99
PID 2056 wrote to memory of 2984	2056	Dxpserver.exe	99
PID 2056 wrote to memory of 2984	2056	Dxpserver.exe	99
PID 2056 wrote to memory of 2984	2056	Dxpserver.exe	99
PID 2056 wrote to memory of 2984	2056	Dxpserver.exe	99
PID 2984 wrote to memory of 396	2984	Dxpserver.exe	100
PID 2984 wrote to memory of 396	2984	Dxpserver.exe	100
PID 2984 wrote to memory of 396	2984	Dxpserver.exe	100

C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe
"C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3452
- C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.exe
  "C:\Users\Admin\AppData\Local\Temp\37768acc6c1196cbe2721bc6c6e4016e7fbe9d3137b1232871df4f6cd99900d8.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:3704
- - 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:392
- 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:1592

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:2516
- 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:2924
- - 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:4280
- 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:4532

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:2056
- 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:2984
- - 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:396

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