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

Checks computer location settings 2 TTPs 4 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe

Executes dropped EXE 2 IoCs

pid	Process
1996	Dxpserver.exe
2456	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-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\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
behavioral2/files/0x000a000000023b82-15.dat	autoit_exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1080 set thread context of 2884	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	82
PID 1996 set thread context of 2456	1996	Dxpserver.exe	96

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	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
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

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.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
2816	schtasks.exe
5020	schtasks.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 2884	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	82
PID 1080 wrote to memory of 2884	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	82
PID 1080 wrote to memory of 2884	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	82
PID 1080 wrote to memory of 2884	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	82
PID 1080 wrote to memory of 2884	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	82
PID 2884 wrote to memory of 2732	2884	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	83
PID 2884 wrote to memory of 2732	2884	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	83
PID 2884 wrote to memory of 2732	2884	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	83
PID 1080 wrote to memory of 2816	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	89
PID 1080 wrote to memory of 2816	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	89
PID 1080 wrote to memory of 2816	1080	1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe	89
PID 1996 wrote to memory of 2456	1996	Dxpserver.exe	96
PID 1996 wrote to memory of 2456	1996	Dxpserver.exe	96
PID 1996 wrote to memory of 2456	1996	Dxpserver.exe	96
PID 1996 wrote to memory of 2456	1996	Dxpserver.exe	96
PID 1996 wrote to memory of 2456	1996	Dxpserver.exe	96
PID 2456 wrote to memory of 2204	2456	Dxpserver.exe	97
PID 2456 wrote to memory of 2204	2456	Dxpserver.exe	97
PID 2456 wrote to memory of 2204	2456	Dxpserver.exe	97
PID 1996 wrote to memory of 5020	1996	Dxpserver.exe	98
PID 1996 wrote to memory of 5020	1996	Dxpserver.exe	98
PID 1996 wrote to memory of 5020	1996	Dxpserver.exe	98

C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
"C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1080
- C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe
  "C:\Users\Admin\AppData\Local\Temp\1036f926a419766d7ea5e581181279d32616e6133ddefda7588235f918528e92N.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2884
- - 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:2732
- 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:2816

C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1996
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2456
- - 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:2204
- 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:5020

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry

3

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

2

T1082

System Location Discovery

T1614

System Language Discovery