remcos | 7fd4efb371a7d50d723f7dcda4f4d177482eb703fc94664b53dff7bd3f9293ea

Modify Registry

Processes:

Backdoor.exeremcos.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Backdoor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Executes dropped EXE 1 IoCs

Processes:

remcos.exe

pid process

2264 remcos.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

2996 cmd.exe
2996 cmd.exe
Reads user/profile data of web browsers 2 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

pid	process
2264	remcos.exe

pid	process
2996	cmd.exe
2996	cmd.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

remcos.exeBackdoor.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Backdoor.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

Modify Registry

Processes:

Backdoor.exeremcos.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Backdoor.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	remcos.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

2540 PING.EXE
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

remcos.exe

pid process

2264 remcos.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

remcos.exe

pid process

2264 remcos.exe

pid	process
2540	PING.EXE

pid	process
2264	remcos.exe

pid	process
2264	remcos.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

Backdoor.execmd.exeremcos.exe

description	pid	process	target process
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2896 wrote to memory of 2996	2896	Backdoor.exe	cmd.exe
PID 2996 wrote to memory of 2540	2996	cmd.exe	PING.EXE
PID 2996 wrote to memory of 2540	2996	cmd.exe	PING.EXE
PID 2996 wrote to memory of 2540	2996	cmd.exe	PING.EXE
PID 2996 wrote to memory of 2540	2996	cmd.exe	PING.EXE
PID 2996 wrote to memory of 2264	2996	cmd.exe	remcos.exe
PID 2996 wrote to memory of 2264	2996	cmd.exe	remcos.exe
PID 2996 wrote to memory of 2264	2996	cmd.exe	remcos.exe
PID 2996 wrote to memory of 2264	2996	cmd.exe	remcos.exe
PID 2264 wrote to memory of 2612	2264	remcos.exe	iexplore.exe
PID 2264 wrote to memory of 2612	2264	remcos.exe	iexplore.exe
PID 2264 wrote to memory of 2612	2264	remcos.exe	iexplore.exe
PID 2264 wrote to memory of 2612	2264	remcos.exe	iexplore.exe

C:\Users\Admin\AppData\Local\Temp\Backdoor.exe
"C:\Users\Admin\AppData\Local\Temp\Backdoor.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Modifies WinLogon
- Suspicious use of WriteProcessMemory
PID:2896

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
2⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2996

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:2540

C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
"C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"
3⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Adds Run key to start application
- Modifies WinLogon
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2264

C:\Program Files (x86)\Internet Explorer\iexplore.exe
"C:\Program Files (x86)\Internet Explorer\iexplore.exe"
4⤵
PID:2612

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Remote System Discovery

T1018

Lateral Movement

Collection

Data from Local System