remcos | 3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8be

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\""	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.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
2356	Dxpserver.exe
2696	Dxpserver.exe
1096	Dxpserver.exe
1996	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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\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\	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.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/0x0007000000018b54-18.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2380 set thread context of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 2356 set thread context of 2696	2356	Dxpserver.exe	35
PID 1096 set thread context of 1996	1096	Dxpserver.exe	40

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	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
2752	schtasks.exe
2800	schtasks.exe
2140	schtasks.exe

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 2380 wrote to memory of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 2380 wrote to memory of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 2380 wrote to memory of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 2380 wrote to memory of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 2380 wrote to memory of 1516	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	29
PID 1516 wrote to memory of 2920	1516	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	30
PID 1516 wrote to memory of 2920	1516	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	30
PID 1516 wrote to memory of 2920	1516	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	30
PID 1516 wrote to memory of 2920	1516	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	30
PID 2380 wrote to memory of 2752	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	31
PID 2380 wrote to memory of 2752	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	31
PID 2380 wrote to memory of 2752	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	31
PID 2380 wrote to memory of 2752	2380	3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe	31
PID 2608 wrote to memory of 2356	2608	taskeng.exe	34
PID 2608 wrote to memory of 2356	2608	taskeng.exe	34
PID 2608 wrote to memory of 2356	2608	taskeng.exe	34
PID 2608 wrote to memory of 2356	2608	taskeng.exe	34
PID 2356 wrote to memory of 2696	2356	Dxpserver.exe	35
PID 2356 wrote to memory of 2696	2356	Dxpserver.exe	35
PID 2356 wrote to memory of 2696	2356	Dxpserver.exe	35
PID 2356 wrote to memory of 2696	2356	Dxpserver.exe	35
PID 2356 wrote to memory of 2696	2356	Dxpserver.exe	35
PID 2356 wrote to memory of 2696	2356	Dxpserver.exe	35
PID 2696 wrote to memory of 2116	2696	Dxpserver.exe	36
PID 2696 wrote to memory of 2116	2696	Dxpserver.exe	36
PID 2696 wrote to memory of 2116	2696	Dxpserver.exe	36
PID 2696 wrote to memory of 2116	2696	Dxpserver.exe	36
PID 2356 wrote to memory of 2800	2356	Dxpserver.exe	37
PID 2356 wrote to memory of 2800	2356	Dxpserver.exe	37
PID 2356 wrote to memory of 2800	2356	Dxpserver.exe	37
PID 2356 wrote to memory of 2800	2356	Dxpserver.exe	37
PID 2608 wrote to memory of 1096	2608	taskeng.exe	39
PID 2608 wrote to memory of 1096	2608	taskeng.exe	39
PID 2608 wrote to memory of 1096	2608	taskeng.exe	39
PID 2608 wrote to memory of 1096	2608	taskeng.exe	39
PID 1096 wrote to memory of 1996	1096	Dxpserver.exe	40
PID 1096 wrote to memory of 1996	1096	Dxpserver.exe	40
PID 1096 wrote to memory of 1996	1096	Dxpserver.exe	40
PID 1096 wrote to memory of 1996	1096	Dxpserver.exe	40
PID 1096 wrote to memory of 1996	1096	Dxpserver.exe	40
PID 1096 wrote to memory of 1996	1096	Dxpserver.exe	40
PID 1996 wrote to memory of 2272	1996	Dxpserver.exe	41
PID 1996 wrote to memory of 2272	1996	Dxpserver.exe	41
PID 1996 wrote to memory of 2272	1996	Dxpserver.exe	41
PID 1996 wrote to memory of 2272	1996	Dxpserver.exe	41
PID 1096 wrote to memory of 2140	1096	Dxpserver.exe	42
PID 1096 wrote to memory of 2140	1096	Dxpserver.exe	42
PID 1096 wrote to memory of 2140	1096	Dxpserver.exe	42
PID 1096 wrote to memory of 2140	1096	Dxpserver.exe	42

C:\Users\Admin\AppData\Local\Temp\3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe
"C:\Users\Admin\AppData\Local\Temp\3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2380
- C:\Users\Admin\AppData\Local\Temp\3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.exe
  "C:\Users\Admin\AppData\Local\Temp\3c7c6549059af5d671ac3983229379f80317aedc16f26df26ffdcaef690ed8beN.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:1516
- - 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:2920
- 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:2752

C:\Windows\system32\taskeng.exe
taskeng.exe {AF09DB38-D4BC-4BBA-86A5-A81E72105344} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2608
- 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:2356
- - 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:2696
  - - 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:2116
- - 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:2800
- 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:1096
- - 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:1996
  - - 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:2272
- - 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:2140

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