remcos | ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872

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\""	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe

Executes dropped EXE 4 IoCs

pid	Process
5016	Dxpserver.exe
4332	Dxpserver.exe
3392	Dxpserver.exe
4264	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\""	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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\	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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/0x0007000000023caf-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4468 set thread context of 2364	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	83
PID 5016 set thread context of 4332	5016	Dxpserver.exe	104
PID 3392 set thread context of 4264	3392	Dxpserver.exe	111

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	WScript.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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
3212	schtasks.exe
3660	schtasks.exe
3064	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 4468 wrote to memory of 2364	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	83
PID 4468 wrote to memory of 2364	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	83
PID 4468 wrote to memory of 2364	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	83
PID 4468 wrote to memory of 2364	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	83
PID 4468 wrote to memory of 2364	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	83
PID 2364 wrote to memory of 4008	2364	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	84
PID 2364 wrote to memory of 4008	2364	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	84
PID 2364 wrote to memory of 4008	2364	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	84
PID 4468 wrote to memory of 3660	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	86
PID 4468 wrote to memory of 3660	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	86
PID 4468 wrote to memory of 3660	4468	ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe	86
PID 5016 wrote to memory of 4332	5016	Dxpserver.exe	104
PID 5016 wrote to memory of 4332	5016	Dxpserver.exe	104
PID 5016 wrote to memory of 4332	5016	Dxpserver.exe	104
PID 5016 wrote to memory of 4332	5016	Dxpserver.exe	104
PID 5016 wrote to memory of 4332	5016	Dxpserver.exe	104
PID 4332 wrote to memory of 1216	4332	Dxpserver.exe	105
PID 4332 wrote to memory of 1216	4332	Dxpserver.exe	105
PID 4332 wrote to memory of 1216	4332	Dxpserver.exe	105
PID 5016 wrote to memory of 3064	5016	Dxpserver.exe	107
PID 5016 wrote to memory of 3064	5016	Dxpserver.exe	107
PID 5016 wrote to memory of 3064	5016	Dxpserver.exe	107
PID 3392 wrote to memory of 4264	3392	Dxpserver.exe	111
PID 3392 wrote to memory of 4264	3392	Dxpserver.exe	111
PID 3392 wrote to memory of 4264	3392	Dxpserver.exe	111
PID 3392 wrote to memory of 4264	3392	Dxpserver.exe	111
PID 3392 wrote to memory of 4264	3392	Dxpserver.exe	111
PID 4264 wrote to memory of 1072	4264	Dxpserver.exe	112
PID 4264 wrote to memory of 1072	4264	Dxpserver.exe	112
PID 4264 wrote to memory of 1072	4264	Dxpserver.exe	112
PID 3392 wrote to memory of 3212	3392	Dxpserver.exe	114
PID 3392 wrote to memory of 3212	3392	Dxpserver.exe	114
PID 3392 wrote to memory of 3212	3392	Dxpserver.exe	114

C:\Users\Admin\AppData\Local\Temp\ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe
"C:\Users\Admin\AppData\Local\Temp\ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4468
- C:\Users\Admin\AppData\Local\Temp\ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.exe
  "C:\Users\Admin\AppData\Local\Temp\ec4606d6eeb73e9feb2a59d4b7fe338d646bfa10797029bcdb8222fc3a698872N.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:2364
- - 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:4008
- 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:3660

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:5016
- 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:4332
- - 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:1216
- 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:3064

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:3392
- 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:4264
- - 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:1072
- 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:3212

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