remcos | 9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236a

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\""	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.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 4 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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Dxpserver.exe

Executes dropped EXE 2 IoCs

pid	Process
3872	Dxpserver.exe
844	Dxpserver.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.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/0x000a000000023b72-15.dat	autoit_exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4864 set thread context of 1896	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	83
PID 3872 set thread context of 844	3872	Dxpserver.exe	104

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 8 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	Dxpserver.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	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.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

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_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
2888	schtasks.exe
2032	schtasks.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4864 wrote to memory of 1896	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	83
PID 4864 wrote to memory of 1896	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	83
PID 4864 wrote to memory of 1896	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	83
PID 4864 wrote to memory of 1896	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	83
PID 4864 wrote to memory of 1896	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	83
PID 1896 wrote to memory of 4024	1896	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	84
PID 1896 wrote to memory of 4024	1896	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	84
PID 1896 wrote to memory of 4024	1896	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	84
PID 4864 wrote to memory of 2888	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	94
PID 4864 wrote to memory of 2888	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	94
PID 4864 wrote to memory of 2888	4864	9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe	94
PID 3872 wrote to memory of 844	3872	Dxpserver.exe	104
PID 3872 wrote to memory of 844	3872	Dxpserver.exe	104
PID 3872 wrote to memory of 844	3872	Dxpserver.exe	104
PID 3872 wrote to memory of 844	3872	Dxpserver.exe	104
PID 3872 wrote to memory of 844	3872	Dxpserver.exe	104
PID 844 wrote to memory of 1156	844	Dxpserver.exe	105
PID 844 wrote to memory of 1156	844	Dxpserver.exe	105
PID 844 wrote to memory of 1156	844	Dxpserver.exe	105
PID 3872 wrote to memory of 2032	3872	Dxpserver.exe	107
PID 3872 wrote to memory of 2032	3872	Dxpserver.exe	107
PID 3872 wrote to memory of 2032	3872	Dxpserver.exe	107

C:\Users\Admin\AppData\Local\Temp\9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
"C:\Users\Admin\AppData\Local\Temp\9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4864
- C:\Users\Admin\AppData\Local\Temp\9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.exe
  "C:\Users\Admin\AppData\Local\Temp\9dc5e8c6e32c349a87d2930464ba391d58ee38034a71b65642c55ef8ff4b236aN.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:1896
- - 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:4024
- 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:\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:3872
- 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:844
- - 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:1156
- 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:2032

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry

3

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

2

T1082

System Location Discovery

T1614

System Language Discovery