remcos | 80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c

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\""	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.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 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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Dxpserver.exe

Executes dropped EXE 4 IoCs

pid	Process
2644	Dxpserver.exe
3716	Dxpserver.exe
4960	Dxpserver.exe
1008	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-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\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\	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.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/0x0007000000023cc4-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4844 set thread context of 1108	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	83
PID 2644 set thread context of 3716	2644	Dxpserver.exe	106
PID 4960 set thread context of 1008	4960	Dxpserver.exe	112

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	Dxpserver.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	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_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
2264	schtasks.exe
4800	schtasks.exe
952	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 4844 wrote to memory of 1108	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	83
PID 4844 wrote to memory of 1108	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	83
PID 4844 wrote to memory of 1108	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	83
PID 4844 wrote to memory of 1108	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	83
PID 4844 wrote to memory of 1108	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	83
PID 1108 wrote to memory of 2816	1108	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	84
PID 1108 wrote to memory of 2816	1108	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	84
PID 1108 wrote to memory of 2816	1108	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	84
PID 4844 wrote to memory of 2264	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	94
PID 4844 wrote to memory of 2264	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	94
PID 4844 wrote to memory of 2264	4844	80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe	94
PID 2644 wrote to memory of 3716	2644	Dxpserver.exe	106
PID 2644 wrote to memory of 3716	2644	Dxpserver.exe	106
PID 2644 wrote to memory of 3716	2644	Dxpserver.exe	106
PID 2644 wrote to memory of 3716	2644	Dxpserver.exe	106
PID 2644 wrote to memory of 3716	2644	Dxpserver.exe	106
PID 3716 wrote to memory of 2136	3716	Dxpserver.exe	107
PID 3716 wrote to memory of 2136	3716	Dxpserver.exe	107
PID 3716 wrote to memory of 2136	3716	Dxpserver.exe	107
PID 2644 wrote to memory of 4800	2644	Dxpserver.exe	109
PID 2644 wrote to memory of 4800	2644	Dxpserver.exe	109
PID 2644 wrote to memory of 4800	2644	Dxpserver.exe	109
PID 4960 wrote to memory of 1008	4960	Dxpserver.exe	112
PID 4960 wrote to memory of 1008	4960	Dxpserver.exe	112
PID 4960 wrote to memory of 1008	4960	Dxpserver.exe	112
PID 4960 wrote to memory of 1008	4960	Dxpserver.exe	112
PID 4960 wrote to memory of 1008	4960	Dxpserver.exe	112
PID 1008 wrote to memory of 1396	1008	Dxpserver.exe	113
PID 1008 wrote to memory of 1396	1008	Dxpserver.exe	113
PID 1008 wrote to memory of 1396	1008	Dxpserver.exe	113
PID 4960 wrote to memory of 952	4960	Dxpserver.exe	115
PID 4960 wrote to memory of 952	4960	Dxpserver.exe	115
PID 4960 wrote to memory of 952	4960	Dxpserver.exe	115

C:\Users\Admin\AppData\Local\Temp\80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe
"C:\Users\Admin\AppData\Local\Temp\80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4844
- C:\Users\Admin\AppData\Local\Temp\80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.exe
  "C:\Users\Admin\AppData\Local\Temp\80b0df0c222b1014ee941834a09ca07b170397c2f4348bce3f0ab815130d6f5c.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:1108
- - 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:2816
- 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:2264

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:2644
- 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:3716
- - 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:2136
- 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:4800

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:4960
- 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:1008
- - 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:1396
- 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:952

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