remcos | 1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92

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\""	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.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 2 IoCs

pid	Process
1480	Dxpserver.exe
2340	Dxpserver.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1488793075-819845221-1497111674-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1488793075-819845221-1497111674-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.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/0x0008000000019259-19.dat	autoit_exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1128 set thread context of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 1480 set thread context of 2340	1480	Dxpserver.exe	37

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 8 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	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	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.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

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
2268	schtasks.exe
2684	schtasks.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 1128 wrote to memory of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 1128 wrote to memory of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 1128 wrote to memory of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 1128 wrote to memory of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 1128 wrote to memory of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 1128 wrote to memory of 2900	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	31
PID 2900 wrote to memory of 1164	2900	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	32
PID 2900 wrote to memory of 1164	2900	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	32
PID 2900 wrote to memory of 1164	2900	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	32
PID 2900 wrote to memory of 1164	2900	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	32
PID 1128 wrote to memory of 2684	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	33
PID 1128 wrote to memory of 2684	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	33
PID 1128 wrote to memory of 2684	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	33
PID 1128 wrote to memory of 2684	1128	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	33
PID 1944 wrote to memory of 1480	1944	taskeng.exe	36
PID 1944 wrote to memory of 1480	1944	taskeng.exe	36
PID 1944 wrote to memory of 1480	1944	taskeng.exe	36
PID 1944 wrote to memory of 1480	1944	taskeng.exe	36
PID 1480 wrote to memory of 2340	1480	Dxpserver.exe	37
PID 1480 wrote to memory of 2340	1480	Dxpserver.exe	37
PID 1480 wrote to memory of 2340	1480	Dxpserver.exe	37
PID 1480 wrote to memory of 2340	1480	Dxpserver.exe	37
PID 1480 wrote to memory of 2340	1480	Dxpserver.exe	37
PID 1480 wrote to memory of 2340	1480	Dxpserver.exe	37
PID 2340 wrote to memory of 2424	2340	Dxpserver.exe	38
PID 2340 wrote to memory of 2424	2340	Dxpserver.exe	38
PID 2340 wrote to memory of 2424	2340	Dxpserver.exe	38
PID 2340 wrote to memory of 2424	2340	Dxpserver.exe	38
PID 1480 wrote to memory of 2268	1480	Dxpserver.exe	39
PID 1480 wrote to memory of 2268	1480	Dxpserver.exe	39
PID 1480 wrote to memory of 2268	1480	Dxpserver.exe	39
PID 1480 wrote to memory of 2268	1480	Dxpserver.exe	39

C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
"C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1128
- C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
  "C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.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:2900
- - 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:1164
- 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:2684

C:\Windows\system32\taskeng.exe
taskeng.exe {962799B3-E01D-44F1-B6E3-9DFFEC83AD4C} S-1-5-21-1488793075-819845221-1497111674-1000:UPNECVIU\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1944
- 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:1480
- - 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:2340
  - - 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:2424
- - 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:2268

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