remcos | 41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
3272	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4484	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	remcos.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Remcos	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
File created	C:\Windows\SysWOW64\Remcos\remcos.exe	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
File opened for modification	C:\Windows\SysWOW64\Remcos\remcos.exe	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4484 set thread context of 3420	4484	remcos.exe	93

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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "182"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000_Classes\Local Settings	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

pid	Process
5024	reg.exe
4476	reg.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4484	remcos.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeShutdownPrivilege	4484	remcos.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4484	remcos.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4484	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3536	LogonUI.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2428 wrote to memory of 4272	2428	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe	82
PID 2428 wrote to memory of 4272	2428	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe	82
PID 2428 wrote to memory of 4272	2428	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe	82
PID 4272 wrote to memory of 5024	4272	cmd.exe	84
PID 4272 wrote to memory of 5024	4272	cmd.exe	84
PID 4272 wrote to memory of 5024	4272	cmd.exe	84
PID 2428 wrote to memory of 3272	2428	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe	85
PID 2428 wrote to memory of 3272	2428	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe	85
PID 2428 wrote to memory of 3272	2428	41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe	85
PID 3272 wrote to memory of 3316	3272	WScript.exe	86
PID 3272 wrote to memory of 3316	3272	WScript.exe	86
PID 3272 wrote to memory of 3316	3272	WScript.exe	86
PID 3316 wrote to memory of 4484	3316	cmd.exe	88
PID 3316 wrote to memory of 4484	3316	cmd.exe	88
PID 3316 wrote to memory of 4484	3316	cmd.exe	88
PID 4484 wrote to memory of 376	4484	remcos.exe	89
PID 4484 wrote to memory of 376	4484	remcos.exe	89
PID 4484 wrote to memory of 376	4484	remcos.exe	89
PID 376 wrote to memory of 4476	376	cmd.exe	92
PID 376 wrote to memory of 4476	376	cmd.exe	92
PID 376 wrote to memory of 4476	376	cmd.exe	92
PID 4484 wrote to memory of 3420	4484	remcos.exe	93
PID 4484 wrote to memory of 3420	4484	remcos.exe	93
PID 4484 wrote to memory of 3420	4484	remcos.exe	93
PID 4484 wrote to memory of 3420	4484	remcos.exe	93

C:\Users\Admin\AppData\Local\Temp\41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe
"C:\Users\Admin\AppData\Local\Temp\41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532.exe"
1⤵
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2428
- C:\Windows\SysWOW64\cmd.exe
  /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4272
- - C:\Windows\SysWOW64\reg.exe
    C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
    3⤵
    - UAC bypass
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:5024
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3272
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\Remcos\remcos.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3316
  - - C:\Windows\SysWOW64\Remcos\remcos.exe
      C:\Windows\SysWOW64\Remcos\remcos.exe
      4⤵
      Adds policy Run key to start application
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of FindShellTrayWindow
      Suspicious use of SendNotifyMessage
      Suspicious use of WriteProcessMemory
      PID:4484
    - - C:\Windows\SysWOW64\cmd.exe
        
        /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:376
      - C:\Windows\SysWOW64\reg.exe
        
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        6⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:4476
    - - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        5⤵
        
        PID:3420

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa39b3055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3536

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery