remcos | f4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\SysWOW64\\mscphost.exe\""	xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\SysWOW64\\mscphost.exe\""	mscphost.exe

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

Executes dropped EXE 1 IoCs

pid	Process
488	mscphost.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	mscphost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\mscphost.exe	xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe
File created	C:\Windows\SysWOW64\mscphost.exe	xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.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	xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mscphost.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2856	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2856	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
488	mscphost.exe
488	mscphost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
488	mscphost.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 960 wrote to memory of 1928	960	xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe	79
PID 1928 wrote to memory of 2856	1928	cmd.exe	81
PID 1928 wrote to memory of 488	1928	cmd.exe	83
PID 488 wrote to memory of 4488	488	mscphost.exe	84

C:\Users\Admin\AppData\Local\Temp\xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe
"C:\Users\Admin\AppData\Local\Temp\xf4f4aab99c894dbb06978b5873db42347f6db1db821945dac94829b6336f1295.exe"
1⤵
- Modifies WinLogon for persistence
- Modifies WinLogon
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:960
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1928
- - C:\Windows\SysWOW64\PING.EXE
    PING 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2856
- - C:\Windows\SysWOW64\mscphost.exe
    "C:\Windows\SysWOW64\mscphost.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:488
  - - C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"
      4⤵
      PID:4488

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System