remcos | 2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438

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\""	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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
4340	Dxpserver.exe
3192	Dxpserver.exe
4968	Dxpserver.exe
3320	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\""	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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\	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\	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x000a000000023ba0-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1700 set thread context of 540	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	83
PID 4340 set thread context of 3192	4340	Dxpserver.exe	105
PID 4968 set thread context of 3320	4968	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	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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
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	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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
1972	schtasks.exe
3512	schtasks.exe
3524	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 1700 wrote to memory of 540	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	83
PID 1700 wrote to memory of 540	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	83
PID 1700 wrote to memory of 540	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	83
PID 1700 wrote to memory of 540	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	83
PID 1700 wrote to memory of 540	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	83
PID 540 wrote to memory of 2820	540	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 540 wrote to memory of 2820	540	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 540 wrote to memory of 2820	540	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 1700 wrote to memory of 1972	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	89
PID 1700 wrote to memory of 1972	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	89
PID 1700 wrote to memory of 1972	1700	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	89
PID 4340 wrote to memory of 3192	4340	Dxpserver.exe	105
PID 4340 wrote to memory of 3192	4340	Dxpserver.exe	105
PID 4340 wrote to memory of 3192	4340	Dxpserver.exe	105
PID 4340 wrote to memory of 3192	4340	Dxpserver.exe	105
PID 4340 wrote to memory of 3192	4340	Dxpserver.exe	105
PID 3192 wrote to memory of 4424	3192	Dxpserver.exe	106
PID 3192 wrote to memory of 4424	3192	Dxpserver.exe	106
PID 3192 wrote to memory of 4424	3192	Dxpserver.exe	106
PID 4340 wrote to memory of 3512	4340	Dxpserver.exe	108
PID 4340 wrote to memory of 3512	4340	Dxpserver.exe	108
PID 4340 wrote to memory of 3512	4340	Dxpserver.exe	108
PID 4968 wrote to memory of 3320	4968	Dxpserver.exe	111
PID 4968 wrote to memory of 3320	4968	Dxpserver.exe	111
PID 4968 wrote to memory of 3320	4968	Dxpserver.exe	111
PID 4968 wrote to memory of 3320	4968	Dxpserver.exe	111
PID 4968 wrote to memory of 3320	4968	Dxpserver.exe	111
PID 3320 wrote to memory of 3196	3320	Dxpserver.exe	112
PID 3320 wrote to memory of 3196	3320	Dxpserver.exe	112
PID 3320 wrote to memory of 3196	3320	Dxpserver.exe	112
PID 4968 wrote to memory of 3524	4968	Dxpserver.exe	114
PID 4968 wrote to memory of 3524	4968	Dxpserver.exe	114
PID 4968 wrote to memory of 3524	4968	Dxpserver.exe	114

C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
"C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1700
- C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
  "C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.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:540
- - 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:2820
- 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:1972

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:4340
- 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:3192
- - 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:4424
- 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:3512

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:4968
- 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:3320
- - 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:3196
- 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:3524

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