remcos | ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8

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\""	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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	Dxpserver.exe

Executes dropped EXE 4 IoCs

pid	Process
2608	Dxpserver.exe
1976	Dxpserver.exe
4860	Dxpserver.exe
1644	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\""	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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\	Dxpserver.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\	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x0007000000023cae-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1144 set thread context of 2460	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	85
PID 2608 set thread context of 1976	2608	Dxpserver.exe	107
PID 4860 set thread context of 1644	4860	Dxpserver.exe	114

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	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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	WScript.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-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
632	schtasks.exe
4412	schtasks.exe
932	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 1144 wrote to memory of 2460	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	85
PID 1144 wrote to memory of 2460	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	85
PID 1144 wrote to memory of 2460	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	85
PID 1144 wrote to memory of 2460	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	85
PID 1144 wrote to memory of 2460	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	85
PID 2460 wrote to memory of 644	2460	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	86
PID 2460 wrote to memory of 644	2460	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	86
PID 2460 wrote to memory of 644	2460	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	86
PID 1144 wrote to memory of 632	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	89
PID 1144 wrote to memory of 632	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	89
PID 1144 wrote to memory of 632	1144	ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe	89
PID 2608 wrote to memory of 1976	2608	Dxpserver.exe	107
PID 2608 wrote to memory of 1976	2608	Dxpserver.exe	107
PID 2608 wrote to memory of 1976	2608	Dxpserver.exe	107
PID 2608 wrote to memory of 1976	2608	Dxpserver.exe	107
PID 2608 wrote to memory of 1976	2608	Dxpserver.exe	107
PID 1976 wrote to memory of 3772	1976	Dxpserver.exe	108
PID 1976 wrote to memory of 3772	1976	Dxpserver.exe	108
PID 1976 wrote to memory of 3772	1976	Dxpserver.exe	108
PID 2608 wrote to memory of 4412	2608	Dxpserver.exe	111
PID 2608 wrote to memory of 4412	2608	Dxpserver.exe	111
PID 2608 wrote to memory of 4412	2608	Dxpserver.exe	111
PID 4860 wrote to memory of 1644	4860	Dxpserver.exe	114
PID 4860 wrote to memory of 1644	4860	Dxpserver.exe	114
PID 4860 wrote to memory of 1644	4860	Dxpserver.exe	114
PID 4860 wrote to memory of 1644	4860	Dxpserver.exe	114
PID 4860 wrote to memory of 1644	4860	Dxpserver.exe	114
PID 1644 wrote to memory of 3492	1644	Dxpserver.exe	115
PID 1644 wrote to memory of 3492	1644	Dxpserver.exe	115
PID 1644 wrote to memory of 3492	1644	Dxpserver.exe	115
PID 4860 wrote to memory of 932	4860	Dxpserver.exe	117
PID 4860 wrote to memory of 932	4860	Dxpserver.exe	117
PID 4860 wrote to memory of 932	4860	Dxpserver.exe	117

C:\Users\Admin\AppData\Local\Temp\ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe
"C:\Users\Admin\AppData\Local\Temp\ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1144
- C:\Users\Admin\AppData\Local\Temp\ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.exe
  "C:\Users\Admin\AppData\Local\Temp\ad330d352ec09c0bf40aa4b330f9b3382abe556f38efe722ec8acfd622161ac8.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:2460
- - 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:644
- 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:632

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:2608
- 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:1976
- - 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:3772
- 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:4412

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:4860
- 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:1644
- - 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:3492
- 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:932

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