remcos | 30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779

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\""	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.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
2500	Dxpserver.exe
2224	Dxpserver.exe
384	Dxpserver.exe
1540	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\""	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.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\	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.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/0x0008000000018b54-19.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2524 set thread context of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 2500 set thread context of 2224	2500	Dxpserver.exe	36
PID 384 set thread context of 1540	384	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	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.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	schtasks.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	Dxpserver.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 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
976	schtasks.exe
1988	schtasks.exe
436	schtasks.exe

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 2524 wrote to memory of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 2524 wrote to memory of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 2524 wrote to memory of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 2524 wrote to memory of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 2524 wrote to memory of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 2524 wrote to memory of 804	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	30
PID 804 wrote to memory of 2984	804	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	31
PID 804 wrote to memory of 2984	804	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	31
PID 804 wrote to memory of 2984	804	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	31
PID 804 wrote to memory of 2984	804	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	31
PID 2524 wrote to memory of 1988	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	32
PID 2524 wrote to memory of 1988	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	32
PID 2524 wrote to memory of 1988	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	32
PID 2524 wrote to memory of 1988	2524	30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe	32
PID 2836 wrote to memory of 2500	2836	taskeng.exe	35
PID 2836 wrote to memory of 2500	2836	taskeng.exe	35
PID 2836 wrote to memory of 2500	2836	taskeng.exe	35
PID 2836 wrote to memory of 2500	2836	taskeng.exe	35
PID 2500 wrote to memory of 2224	2500	Dxpserver.exe	36
PID 2500 wrote to memory of 2224	2500	Dxpserver.exe	36
PID 2500 wrote to memory of 2224	2500	Dxpserver.exe	36
PID 2500 wrote to memory of 2224	2500	Dxpserver.exe	36
PID 2500 wrote to memory of 2224	2500	Dxpserver.exe	36
PID 2500 wrote to memory of 2224	2500	Dxpserver.exe	36
PID 2224 wrote to memory of 2456	2224	Dxpserver.exe	37
PID 2224 wrote to memory of 2456	2224	Dxpserver.exe	37
PID 2224 wrote to memory of 2456	2224	Dxpserver.exe	37
PID 2224 wrote to memory of 2456	2224	Dxpserver.exe	37
PID 2500 wrote to memory of 436	2500	Dxpserver.exe	38
PID 2500 wrote to memory of 436	2500	Dxpserver.exe	38
PID 2500 wrote to memory of 436	2500	Dxpserver.exe	38
PID 2500 wrote to memory of 436	2500	Dxpserver.exe	38
PID 2836 wrote to memory of 384	2836	taskeng.exe	40
PID 2836 wrote to memory of 384	2836	taskeng.exe	40
PID 2836 wrote to memory of 384	2836	taskeng.exe	40
PID 2836 wrote to memory of 384	2836	taskeng.exe	40
PID 384 wrote to memory of 1540	384	Dxpserver.exe	41
PID 384 wrote to memory of 1540	384	Dxpserver.exe	41
PID 384 wrote to memory of 1540	384	Dxpserver.exe	41
PID 384 wrote to memory of 1540	384	Dxpserver.exe	41
PID 384 wrote to memory of 1540	384	Dxpserver.exe	41
PID 384 wrote to memory of 1540	384	Dxpserver.exe	41
PID 1540 wrote to memory of 2408	1540	Dxpserver.exe	42
PID 1540 wrote to memory of 2408	1540	Dxpserver.exe	42
PID 1540 wrote to memory of 2408	1540	Dxpserver.exe	42
PID 1540 wrote to memory of 2408	1540	Dxpserver.exe	42
PID 384 wrote to memory of 976	384	Dxpserver.exe	43
PID 384 wrote to memory of 976	384	Dxpserver.exe	43
PID 384 wrote to memory of 976	384	Dxpserver.exe	43
PID 384 wrote to memory of 976	384	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe
"C:\Users\Admin\AppData\Local\Temp\30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2524
- C:\Users\Admin\AppData\Local\Temp\30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.exe
  "C:\Users\Admin\AppData\Local\Temp\30e8c292e2ab87def0f57b13d80c8617f2ccc3e3f734a45e784325ce00c14779N.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:804
- - 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:2984
- 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:1988

C:\Windows\system32\taskeng.exe
taskeng.exe {DE111E05-271A-49CD-98E6-FC72C21EC5A4} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2836
- 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:2500
- - 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:2224
  - - 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:2456
- - 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:436
- 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:384
- - 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:1540
  - - 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:2408
- - 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:976

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