remcos | cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d

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\""	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.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
2828	Dxpserver.exe
2096	Dxpserver.exe
2180	Dxpserver.exe
3024	Dxpserver.exe

Loads dropped DLL 1 IoCs

pid	Process
2828	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-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\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\	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.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/0x0006000000019401-20.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2132 set thread context of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2828 set thread context of 2096	2828	Dxpserver.exe	36
PID 2180 set thread context of 3024	2180	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 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	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.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

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
2536	schtasks.exe
1640	schtasks.exe
2288	schtasks.exe

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 2132 wrote to memory of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2132 wrote to memory of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2132 wrote to memory of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2132 wrote to memory of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2132 wrote to memory of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2132 wrote to memory of 2740	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	30
PID 2740 wrote to memory of 2696	2740	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	31
PID 2740 wrote to memory of 2696	2740	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	31
PID 2740 wrote to memory of 2696	2740	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	31
PID 2740 wrote to memory of 2696	2740	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	31
PID 2132 wrote to memory of 2536	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	32
PID 2132 wrote to memory of 2536	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	32
PID 2132 wrote to memory of 2536	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	32
PID 2132 wrote to memory of 2536	2132	cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe	32
PID 1688 wrote to memory of 2828	1688	taskeng.exe	35
PID 1688 wrote to memory of 2828	1688	taskeng.exe	35
PID 1688 wrote to memory of 2828	1688	taskeng.exe	35
PID 1688 wrote to memory of 2828	1688	taskeng.exe	35
PID 2828 wrote to memory of 2096	2828	Dxpserver.exe	36
PID 2828 wrote to memory of 2096	2828	Dxpserver.exe	36
PID 2828 wrote to memory of 2096	2828	Dxpserver.exe	36
PID 2828 wrote to memory of 2096	2828	Dxpserver.exe	36
PID 2828 wrote to memory of 2096	2828	Dxpserver.exe	36
PID 2828 wrote to memory of 2096	2828	Dxpserver.exe	36
PID 2096 wrote to memory of 800	2096	Dxpserver.exe	37
PID 2096 wrote to memory of 800	2096	Dxpserver.exe	37
PID 2096 wrote to memory of 800	2096	Dxpserver.exe	37
PID 2096 wrote to memory of 800	2096	Dxpserver.exe	37
PID 2828 wrote to memory of 1640	2828	Dxpserver.exe	38
PID 2828 wrote to memory of 1640	2828	Dxpserver.exe	38
PID 2828 wrote to memory of 1640	2828	Dxpserver.exe	38
PID 2828 wrote to memory of 1640	2828	Dxpserver.exe	38
PID 1688 wrote to memory of 2180	1688	taskeng.exe	41
PID 1688 wrote to memory of 2180	1688	taskeng.exe	41
PID 1688 wrote to memory of 2180	1688	taskeng.exe	41
PID 1688 wrote to memory of 2180	1688	taskeng.exe	41
PID 2180 wrote to memory of 3024	2180	Dxpserver.exe	42
PID 2180 wrote to memory of 3024	2180	Dxpserver.exe	42
PID 2180 wrote to memory of 3024	2180	Dxpserver.exe	42
PID 2180 wrote to memory of 3024	2180	Dxpserver.exe	42
PID 2180 wrote to memory of 3024	2180	Dxpserver.exe	42
PID 2180 wrote to memory of 3024	2180	Dxpserver.exe	42
PID 3024 wrote to memory of 1788	3024	Dxpserver.exe	43
PID 3024 wrote to memory of 1788	3024	Dxpserver.exe	43
PID 3024 wrote to memory of 1788	3024	Dxpserver.exe	43
PID 3024 wrote to memory of 1788	3024	Dxpserver.exe	43
PID 2180 wrote to memory of 2288	2180	Dxpserver.exe	44
PID 2180 wrote to memory of 2288	2180	Dxpserver.exe	44
PID 2180 wrote to memory of 2288	2180	Dxpserver.exe	44
PID 2180 wrote to memory of 2288	2180	Dxpserver.exe	44

C:\Users\Admin\AppData\Local\Temp\cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe
"C:\Users\Admin\AppData\Local\Temp\cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2132
- C:\Users\Admin\AppData\Local\Temp\cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.exe
  "C:\Users\Admin\AppData\Local\Temp\cfad180a76b4acfb7d6a3ee4173d3345a263941d214505e4ae71adcd9b99732d.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:2740
- - 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:2696
- 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:2536

C:\Windows\system32\taskeng.exe
taskeng.exe {EA8729FF-7092-4AF8-8190-159E9C418522} S-1-5-21-3290804112-2823094203-3137964600-1000:VORHPBAB\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1688
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2828
- - 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:2096
  - - 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:800
- - 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:1640
- 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:2180
- - 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:3024
  - - 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:1788
- - 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:2288

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