remcos | 3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a

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\""	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.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
3000	Dxpserver.exe
2764	Dxpserver.exe
2364	Dxpserver.exe
2204	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-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\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\	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.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/0x000600000001930d-19.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2660 set thread context of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 3000 set thread context of 2764	3000	Dxpserver.exe	36
PID 2364 set thread context of 2204	2364	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	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	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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.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
2548	schtasks.exe
1060	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2660 wrote to memory of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 2660 wrote to memory of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 2660 wrote to memory of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 2660 wrote to memory of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 2660 wrote to memory of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 2660 wrote to memory of 2680	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	30
PID 2680 wrote to memory of 2684	2680	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	31
PID 2680 wrote to memory of 2684	2680	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	31
PID 2680 wrote to memory of 2684	2680	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	31
PID 2680 wrote to memory of 2684	2680	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	31
PID 2660 wrote to memory of 2548	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	32
PID 2660 wrote to memory of 2548	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	32
PID 2660 wrote to memory of 2548	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	32
PID 2660 wrote to memory of 2548	2660	3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe	32
PID 1552 wrote to memory of 3000	1552	taskeng.exe	35
PID 1552 wrote to memory of 3000	1552	taskeng.exe	35
PID 1552 wrote to memory of 3000	1552	taskeng.exe	35
PID 1552 wrote to memory of 3000	1552	taskeng.exe	35
PID 3000 wrote to memory of 2764	3000	Dxpserver.exe	36
PID 3000 wrote to memory of 2764	3000	Dxpserver.exe	36
PID 3000 wrote to memory of 2764	3000	Dxpserver.exe	36
PID 3000 wrote to memory of 2764	3000	Dxpserver.exe	36
PID 3000 wrote to memory of 2764	3000	Dxpserver.exe	36
PID 3000 wrote to memory of 2764	3000	Dxpserver.exe	36
PID 2764 wrote to memory of 2648	2764	Dxpserver.exe	37
PID 2764 wrote to memory of 2648	2764	Dxpserver.exe	37
PID 2764 wrote to memory of 2648	2764	Dxpserver.exe	37
PID 2764 wrote to memory of 2648	2764	Dxpserver.exe	37
PID 3000 wrote to memory of 1060	3000	Dxpserver.exe	39
PID 3000 wrote to memory of 1060	3000	Dxpserver.exe	39
PID 3000 wrote to memory of 1060	3000	Dxpserver.exe	39
PID 3000 wrote to memory of 1060	3000	Dxpserver.exe	39
PID 1552 wrote to memory of 2364	1552	taskeng.exe	41
PID 1552 wrote to memory of 2364	1552	taskeng.exe	41
PID 1552 wrote to memory of 2364	1552	taskeng.exe	41
PID 1552 wrote to memory of 2364	1552	taskeng.exe	41
PID 2364 wrote to memory of 2204	2364	Dxpserver.exe	42
PID 2364 wrote to memory of 2204	2364	Dxpserver.exe	42
PID 2364 wrote to memory of 2204	2364	Dxpserver.exe	42
PID 2364 wrote to memory of 2204	2364	Dxpserver.exe	42
PID 2364 wrote to memory of 2204	2364	Dxpserver.exe	42
PID 2364 wrote to memory of 2204	2364	Dxpserver.exe	42
PID 2204 wrote to memory of 3028	2204	Dxpserver.exe	43
PID 2204 wrote to memory of 3028	2204	Dxpserver.exe	43
PID 2204 wrote to memory of 3028	2204	Dxpserver.exe	43
PID 2204 wrote to memory of 3028	2204	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe
"C:\Users\Admin\AppData\Local\Temp\3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2660
- C:\Users\Admin\AppData\Local\Temp\3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.exe
  "C:\Users\Admin\AppData\Local\Temp\3542d15a01ea595ee52539d6fd04e86426c2b8e0f7f43e982c05f821d1c10d6a.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:2680
- - 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:2684
- 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:2548

C:\Windows\system32\taskeng.exe
taskeng.exe {51727C37-E9C4-4D2C-AA0F-08A591DD7AAB} S-1-5-21-2703099537-420551529-3771253338-1000:XECUDNCD\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1552
- 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:3000
- - 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:2764
  - - 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:2648
- - 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:1060
- 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:2364
- - 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:2204
  - - 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:3028

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