remcos | 1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19

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\""	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe

Executes dropped EXE 4 IoCs

pid	Process
4376	Dxpserver.exe
512	Dxpserver.exe
4200	Dxpserver.exe
2420	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\""	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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\	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x0007000000023cb8-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4248 set thread context of 2852	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	83
PID 4376 set thread context of 512	4376	Dxpserver.exe	105
PID 4200 set thread context of 2420	4200	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 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	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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	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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.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-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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
3588	schtasks.exe
1640	schtasks.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 2852	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	83
PID 4248 wrote to memory of 2852	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	83
PID 4248 wrote to memory of 2852	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	83
PID 4248 wrote to memory of 2852	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	83
PID 4248 wrote to memory of 2852	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	83
PID 2852 wrote to memory of 2892	2852	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	84
PID 2852 wrote to memory of 2892	2852	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	84
PID 2852 wrote to memory of 2892	2852	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	84
PID 4248 wrote to memory of 3588	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	99
PID 4248 wrote to memory of 3588	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	99
PID 4248 wrote to memory of 3588	4248	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	99
PID 4376 wrote to memory of 512	4376	Dxpserver.exe	105
PID 4376 wrote to memory of 512	4376	Dxpserver.exe	105
PID 4376 wrote to memory of 512	4376	Dxpserver.exe	105
PID 4376 wrote to memory of 512	4376	Dxpserver.exe	105
PID 4376 wrote to memory of 512	4376	Dxpserver.exe	105
PID 512 wrote to memory of 2768	512	Dxpserver.exe	106
PID 512 wrote to memory of 2768	512	Dxpserver.exe	106
PID 512 wrote to memory of 2768	512	Dxpserver.exe	106
PID 4376 wrote to memory of 1640	4376	Dxpserver.exe	108
PID 4376 wrote to memory of 1640	4376	Dxpserver.exe	108
PID 4376 wrote to memory of 1640	4376	Dxpserver.exe	108
PID 4200 wrote to memory of 2420	4200	Dxpserver.exe	111
PID 4200 wrote to memory of 2420	4200	Dxpserver.exe	111
PID 4200 wrote to memory of 2420	4200	Dxpserver.exe	111
PID 4200 wrote to memory of 2420	4200	Dxpserver.exe	111
PID 4200 wrote to memory of 2420	4200	Dxpserver.exe	111
PID 2420 wrote to memory of 1564	2420	Dxpserver.exe	112
PID 2420 wrote to memory of 1564	2420	Dxpserver.exe	112
PID 2420 wrote to memory of 1564	2420	Dxpserver.exe	112

C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe
"C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4248
- C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe
  "C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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:2852
- - 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:2892
- 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:3588

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:4376
- 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:512
- - 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:2768
- 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:1640

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:4200
- 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:2420
- - 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:1564

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