remcos | 88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12

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\\firefox\\firefox1.exe\""	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	firefox1.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
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remcos

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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
2332	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
1592	firefox1.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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\firefox = "\"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\firefox = "\"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	firefox1.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\	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	firefox1.exe

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 4 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	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
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	firefox1.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1592	firefox1.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3532 wrote to memory of 2332	3532	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe	83
PID 3532 wrote to memory of 2332	3532	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe	83
PID 3532 wrote to memory of 2332	3532	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe	83
PID 2332 wrote to memory of 3804	2332	WScript.exe	84
PID 2332 wrote to memory of 3804	2332	WScript.exe	84
PID 2332 wrote to memory of 3804	2332	WScript.exe	84
PID 3804 wrote to memory of 1592	3804	cmd.exe	86
PID 3804 wrote to memory of 1592	3804	cmd.exe	86
PID 3804 wrote to memory of 1592	3804	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe"
1⤵
- 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:3532
- 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:2332
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3804
  - - C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe
      C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Adds Run key to start application
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      PID:1592

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Defense Evasion

Modify Registry

3

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

2

T1082

System Location Discovery

T1614

System Language Discovery