remcos | d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3

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\""	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.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
2796	Dxpserver.exe
2456	Dxpserver.exe
1992	Dxpserver.exe
1780	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\""	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.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\	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.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/0x0007000000015d50-20.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2324 set thread context of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 2796 set thread context of 2456	2796	Dxpserver.exe	36
PID 1992 set thread context of 1780	1992	Dxpserver.exe	41

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	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.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
2104	schtasks.exe
2072	schtasks.exe
1684	schtasks.exe

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 2324 wrote to memory of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 2324 wrote to memory of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 2324 wrote to memory of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 2324 wrote to memory of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 2324 wrote to memory of 1032	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	28
PID 1032 wrote to memory of 2932	1032	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	29
PID 1032 wrote to memory of 2932	1032	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	29
PID 1032 wrote to memory of 2932	1032	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	29
PID 1032 wrote to memory of 2932	1032	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	29
PID 2324 wrote to memory of 2072	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	30
PID 2324 wrote to memory of 2072	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	30
PID 2324 wrote to memory of 2072	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	30
PID 2324 wrote to memory of 2072	2324	d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe	30
PID 2776 wrote to memory of 2796	2776	taskeng.exe	35
PID 2776 wrote to memory of 2796	2776	taskeng.exe	35
PID 2776 wrote to memory of 2796	2776	taskeng.exe	35
PID 2776 wrote to memory of 2796	2776	taskeng.exe	35
PID 2796 wrote to memory of 2456	2796	Dxpserver.exe	36
PID 2796 wrote to memory of 2456	2796	Dxpserver.exe	36
PID 2796 wrote to memory of 2456	2796	Dxpserver.exe	36
PID 2796 wrote to memory of 2456	2796	Dxpserver.exe	36
PID 2796 wrote to memory of 2456	2796	Dxpserver.exe	36
PID 2796 wrote to memory of 2456	2796	Dxpserver.exe	36
PID 2456 wrote to memory of 2568	2456	Dxpserver.exe	37
PID 2456 wrote to memory of 2568	2456	Dxpserver.exe	37
PID 2456 wrote to memory of 2568	2456	Dxpserver.exe	37
PID 2456 wrote to memory of 2568	2456	Dxpserver.exe	37
PID 2796 wrote to memory of 1684	2796	Dxpserver.exe	38
PID 2796 wrote to memory of 1684	2796	Dxpserver.exe	38
PID 2796 wrote to memory of 1684	2796	Dxpserver.exe	38
PID 2796 wrote to memory of 1684	2796	Dxpserver.exe	38
PID 2776 wrote to memory of 1992	2776	taskeng.exe	40
PID 2776 wrote to memory of 1992	2776	taskeng.exe	40
PID 2776 wrote to memory of 1992	2776	taskeng.exe	40
PID 2776 wrote to memory of 1992	2776	taskeng.exe	40
PID 1992 wrote to memory of 1780	1992	Dxpserver.exe	41
PID 1992 wrote to memory of 1780	1992	Dxpserver.exe	41
PID 1992 wrote to memory of 1780	1992	Dxpserver.exe	41
PID 1992 wrote to memory of 1780	1992	Dxpserver.exe	41
PID 1992 wrote to memory of 1780	1992	Dxpserver.exe	41
PID 1992 wrote to memory of 1780	1992	Dxpserver.exe	41
PID 1780 wrote to memory of 1580	1780	Dxpserver.exe	42
PID 1780 wrote to memory of 1580	1780	Dxpserver.exe	42
PID 1780 wrote to memory of 1580	1780	Dxpserver.exe	42
PID 1780 wrote to memory of 1580	1780	Dxpserver.exe	42
PID 1992 wrote to memory of 2104	1992	Dxpserver.exe	43
PID 1992 wrote to memory of 2104	1992	Dxpserver.exe	43
PID 1992 wrote to memory of 2104	1992	Dxpserver.exe	43
PID 1992 wrote to memory of 2104	1992	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe
"C:\Users\Admin\AppData\Local\Temp\d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2324
- C:\Users\Admin\AppData\Local\Temp\d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.exe
  "C:\Users\Admin\AppData\Local\Temp\d45d672180e6840443591839dfdaa304142243ff495d6a5ad5852142dc6846d3.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:1032
- - 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:2932
- 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:2072

C:\Windows\system32\taskeng.exe
taskeng.exe {8BD25A1D-0E59-44A7-A192-DF9C59F7EE25} S-1-5-21-3533259084-2542256011-65585152-1000:XPAJOTIY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2776
- 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:2796
- - 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:2456
  - - 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:2568
- - 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:1684
- 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:1992
- - 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:1780
  - - 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:1580
- - 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:2104

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