remcos | 1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19

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\""	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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
1524	Dxpserver.exe
2344	Dxpserver.exe
1924	Dxpserver.exe
2356	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\""	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe

AutoIT Executable 2 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral1/files/0x000700000001658d-19.dat	autoit_exe
behavioral1/files/0x002e000000015e5b-32.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2776 set thread context of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 1524 set thread context of 2344	1524	Dxpserver.exe	36
PID 1924 set thread context of 2356	1924	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 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	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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	WScript.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
2992	schtasks.exe
2700	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2776 wrote to memory of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 2776 wrote to memory of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 2776 wrote to memory of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 2776 wrote to memory of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 2776 wrote to memory of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 2776 wrote to memory of 2848	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	30
PID 2848 wrote to memory of 3064	2848	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	31
PID 2848 wrote to memory of 3064	2848	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	31
PID 2848 wrote to memory of 3064	2848	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	31
PID 2848 wrote to memory of 3064	2848	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	31
PID 2776 wrote to memory of 2700	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	32
PID 2776 wrote to memory of 2700	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	32
PID 2776 wrote to memory of 2700	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	32
PID 2776 wrote to memory of 2700	2776	1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe	32
PID 2020 wrote to memory of 1524	2020	taskeng.exe	35
PID 2020 wrote to memory of 1524	2020	taskeng.exe	35
PID 2020 wrote to memory of 1524	2020	taskeng.exe	35
PID 2020 wrote to memory of 1524	2020	taskeng.exe	35
PID 1524 wrote to memory of 2344	1524	Dxpserver.exe	36
PID 1524 wrote to memory of 2344	1524	Dxpserver.exe	36
PID 1524 wrote to memory of 2344	1524	Dxpserver.exe	36
PID 1524 wrote to memory of 2344	1524	Dxpserver.exe	36
PID 1524 wrote to memory of 2344	1524	Dxpserver.exe	36
PID 1524 wrote to memory of 2344	1524	Dxpserver.exe	36
PID 2344 wrote to memory of 1476	2344	Dxpserver.exe	37
PID 2344 wrote to memory of 1476	2344	Dxpserver.exe	37
PID 2344 wrote to memory of 1476	2344	Dxpserver.exe	37
PID 2344 wrote to memory of 1476	2344	Dxpserver.exe	37
PID 1524 wrote to memory of 2992	1524	Dxpserver.exe	38
PID 1524 wrote to memory of 2992	1524	Dxpserver.exe	38
PID 1524 wrote to memory of 2992	1524	Dxpserver.exe	38
PID 1524 wrote to memory of 2992	1524	Dxpserver.exe	38
PID 2020 wrote to memory of 1924	2020	taskeng.exe	40
PID 2020 wrote to memory of 1924	2020	taskeng.exe	40
PID 2020 wrote to memory of 1924	2020	taskeng.exe	40
PID 2020 wrote to memory of 1924	2020	taskeng.exe	40
PID 1924 wrote to memory of 2356	1924	Dxpserver.exe	41
PID 1924 wrote to memory of 2356	1924	Dxpserver.exe	41
PID 1924 wrote to memory of 2356	1924	Dxpserver.exe	41
PID 1924 wrote to memory of 2356	1924	Dxpserver.exe	41
PID 1924 wrote to memory of 2356	1924	Dxpserver.exe	41
PID 1924 wrote to memory of 2356	1924	Dxpserver.exe	41
PID 2356 wrote to memory of 2560	2356	Dxpserver.exe	42
PID 2356 wrote to memory of 2560	2356	Dxpserver.exe	42
PID 2356 wrote to memory of 2560	2356	Dxpserver.exe	42
PID 2356 wrote to memory of 2560	2356	Dxpserver.exe	42

C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe
"C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2776
- C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.exe
  "C:\Users\Admin\AppData\Local\Temp\1a65ede96a531a3c99781475e54b28516205bc708db028f8a9f5be5c2546bb19.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:2848
- - 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:3064
- 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:2700

C:\Windows\system32\taskeng.exe
taskeng.exe {B9465101-993F-43F4-A3C5-256EB9146F65} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2020
- 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:1524
- - 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:2344
  - - 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:1476
- - 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:2992
- 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:1924
- - 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:2356
  - - 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:2560

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