remcos | 8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137

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\""	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	Dxpserver.exe

Executes dropped EXE 4 IoCs

pid	Process
1908	Dxpserver.exe
4884	Dxpserver.exe
3044	Dxpserver.exe
1552	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-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\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\	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.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/0x0007000000023c6a-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3672 set thread context of 3796	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	83
PID 1908 set thread context of 4884	1908	Dxpserver.exe	104
PID 3044 set thread context of 1552	3044	Dxpserver.exe	110

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	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.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	Dxpserver.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	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	WScript.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_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
4844	schtasks.exe
220	schtasks.exe
4024	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 3672 wrote to memory of 3796	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	83
PID 3672 wrote to memory of 3796	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	83
PID 3672 wrote to memory of 3796	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	83
PID 3672 wrote to memory of 3796	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	83
PID 3672 wrote to memory of 3796	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	83
PID 3796 wrote to memory of 1596	3796	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	84
PID 3796 wrote to memory of 1596	3796	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	84
PID 3796 wrote to memory of 1596	3796	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	84
PID 3672 wrote to memory of 4844	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	87
PID 3672 wrote to memory of 4844	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	87
PID 3672 wrote to memory of 4844	3672	8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe	87
PID 1908 wrote to memory of 4884	1908	Dxpserver.exe	104
PID 1908 wrote to memory of 4884	1908	Dxpserver.exe	104
PID 1908 wrote to memory of 4884	1908	Dxpserver.exe	104
PID 1908 wrote to memory of 4884	1908	Dxpserver.exe	104
PID 1908 wrote to memory of 4884	1908	Dxpserver.exe	104
PID 4884 wrote to memory of 1004	4884	Dxpserver.exe	105
PID 4884 wrote to memory of 1004	4884	Dxpserver.exe	105
PID 4884 wrote to memory of 1004	4884	Dxpserver.exe	105
PID 1908 wrote to memory of 220	1908	Dxpserver.exe	107
PID 1908 wrote to memory of 220	1908	Dxpserver.exe	107
PID 1908 wrote to memory of 220	1908	Dxpserver.exe	107
PID 3044 wrote to memory of 1552	3044	Dxpserver.exe	110
PID 3044 wrote to memory of 1552	3044	Dxpserver.exe	110
PID 3044 wrote to memory of 1552	3044	Dxpserver.exe	110
PID 3044 wrote to memory of 1552	3044	Dxpserver.exe	110
PID 3044 wrote to memory of 1552	3044	Dxpserver.exe	110
PID 1552 wrote to memory of 4732	1552	Dxpserver.exe	111
PID 1552 wrote to memory of 4732	1552	Dxpserver.exe	111
PID 1552 wrote to memory of 4732	1552	Dxpserver.exe	111
PID 3044 wrote to memory of 4024	3044	Dxpserver.exe	113
PID 3044 wrote to memory of 4024	3044	Dxpserver.exe	113
PID 3044 wrote to memory of 4024	3044	Dxpserver.exe	113

C:\Users\Admin\AppData\Local\Temp\8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
"C:\Users\Admin\AppData\Local\Temp\8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3672
- C:\Users\Admin\AppData\Local\Temp\8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.exe
  "C:\Users\Admin\AppData\Local\Temp\8a89b09e5ecd985408b3614a1092803957a6154b2925f43ad85fcb5bae6fb137.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:3796
- - 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:1596
- 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:4844

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:1908
- 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:4884
- - 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:1004
- 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:220

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:3044
- 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:1552
- - 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:4732
- 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:4024

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