remcos | f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39

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\""	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.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

Executes dropped EXE 4 IoCs

pid	Process
2648	Dxpserver.exe
2688	Dxpserver.exe
2952	Dxpserver.exe
2912	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-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\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\	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.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
behavioral1/files/0x0007000000016b17-19.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2444 set thread context of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2648 set thread context of 2688	2648	Dxpserver.exe	37
PID 2952 set thread context of 2912	2952	Dxpserver.exe	42

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	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.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
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

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
2772	schtasks.exe
1900	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2444 wrote to memory of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2444 wrote to memory of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2444 wrote to memory of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2444 wrote to memory of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2444 wrote to memory of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2444 wrote to memory of 2540	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	30
PID 2540 wrote to memory of 2136	2540	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	31
PID 2540 wrote to memory of 2136	2540	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	31
PID 2540 wrote to memory of 2136	2540	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	31
PID 2540 wrote to memory of 2136	2540	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	31
PID 2444 wrote to memory of 2772	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	33
PID 2444 wrote to memory of 2772	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	33
PID 2444 wrote to memory of 2772	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	33
PID 2444 wrote to memory of 2772	2444	f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe	33
PID 2348 wrote to memory of 2648	2348	taskeng.exe	36
PID 2348 wrote to memory of 2648	2348	taskeng.exe	36
PID 2348 wrote to memory of 2648	2348	taskeng.exe	36
PID 2348 wrote to memory of 2648	2348	taskeng.exe	36
PID 2648 wrote to memory of 2688	2648	Dxpserver.exe	37
PID 2648 wrote to memory of 2688	2648	Dxpserver.exe	37
PID 2648 wrote to memory of 2688	2648	Dxpserver.exe	37
PID 2648 wrote to memory of 2688	2648	Dxpserver.exe	37
PID 2648 wrote to memory of 2688	2648	Dxpserver.exe	37
PID 2648 wrote to memory of 2688	2648	Dxpserver.exe	37
PID 2688 wrote to memory of 1140	2688	Dxpserver.exe	38
PID 2688 wrote to memory of 1140	2688	Dxpserver.exe	38
PID 2688 wrote to memory of 1140	2688	Dxpserver.exe	38
PID 2688 wrote to memory of 1140	2688	Dxpserver.exe	38
PID 2648 wrote to memory of 1900	2648	Dxpserver.exe	39
PID 2648 wrote to memory of 1900	2648	Dxpserver.exe	39
PID 2648 wrote to memory of 1900	2648	Dxpserver.exe	39
PID 2648 wrote to memory of 1900	2648	Dxpserver.exe	39
PID 2348 wrote to memory of 2952	2348	taskeng.exe	41
PID 2348 wrote to memory of 2952	2348	taskeng.exe	41
PID 2348 wrote to memory of 2952	2348	taskeng.exe	41
PID 2348 wrote to memory of 2952	2348	taskeng.exe	41
PID 2952 wrote to memory of 2912	2952	Dxpserver.exe	42
PID 2952 wrote to memory of 2912	2952	Dxpserver.exe	42
PID 2952 wrote to memory of 2912	2952	Dxpserver.exe	42
PID 2952 wrote to memory of 2912	2952	Dxpserver.exe	42
PID 2952 wrote to memory of 2912	2952	Dxpserver.exe	42
PID 2952 wrote to memory of 2912	2952	Dxpserver.exe	42
PID 2912 wrote to memory of 2220	2912	Dxpserver.exe	43
PID 2912 wrote to memory of 2220	2912	Dxpserver.exe	43
PID 2912 wrote to memory of 2220	2912	Dxpserver.exe	43
PID 2912 wrote to memory of 2220	2912	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe
"C:\Users\Admin\AppData\Local\Temp\f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2444
- C:\Users\Admin\AppData\Local\Temp\f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe
  "C:\Users\Admin\AppData\Local\Temp\f3b4bd01388ef8fa3e63da36192a1b56d027c13df4375986c2f0404e16ab9b39N.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2540
- - 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:2136
- 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:2772

C:\Windows\system32\taskeng.exe
taskeng.exe {03E602F0-9F9A-4CD7-8C27-19F03AD681F2} S-1-5-21-3533259084-2542256011-65585152-1000:XPAJOTIY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2348
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2648
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2688
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:1140
- - 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
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1900
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2952
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2912
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:2220

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