remcos | b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0

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\""	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.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
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

Executes dropped EXE 4 IoCs

pid	Process
2676	Dxpserver.exe
2216	Dxpserver.exe
2828	Dxpserver.exe
2168	Dxpserver.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Modifies WinLogon 2 TTPs 3 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.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
behavioral1/files/0x00090000000167dc-18.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2520 set thread context of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 2676 set thread context of 2216	2676	Dxpserver.exe	37
PID 2828 set thread context of 2168	2828	Dxpserver.exe	42

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 11 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	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.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	Dxpserver.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
1616	schtasks.exe
2892	schtasks.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2520 wrote to memory of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 2520 wrote to memory of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 2520 wrote to memory of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 2520 wrote to memory of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 2520 wrote to memory of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 2520 wrote to memory of 3012	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	31
PID 3012 wrote to memory of 632	3012	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	32
PID 3012 wrote to memory of 632	3012	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	32
PID 3012 wrote to memory of 632	3012	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	32
PID 3012 wrote to memory of 632	3012	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	32
PID 2520 wrote to memory of 2892	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	33
PID 2520 wrote to memory of 2892	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	33
PID 2520 wrote to memory of 2892	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	33
PID 2520 wrote to memory of 2892	2520	b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe	33
PID 2608 wrote to memory of 2676	2608	taskeng.exe	36
PID 2608 wrote to memory of 2676	2608	taskeng.exe	36
PID 2608 wrote to memory of 2676	2608	taskeng.exe	36
PID 2608 wrote to memory of 2676	2608	taskeng.exe	36
PID 2676 wrote to memory of 2216	2676	Dxpserver.exe	37
PID 2676 wrote to memory of 2216	2676	Dxpserver.exe	37
PID 2676 wrote to memory of 2216	2676	Dxpserver.exe	37
PID 2676 wrote to memory of 2216	2676	Dxpserver.exe	37
PID 2676 wrote to memory of 2216	2676	Dxpserver.exe	37
PID 2676 wrote to memory of 2216	2676	Dxpserver.exe	37
PID 2216 wrote to memory of 1828	2216	Dxpserver.exe	38
PID 2216 wrote to memory of 1828	2216	Dxpserver.exe	38
PID 2216 wrote to memory of 1828	2216	Dxpserver.exe	38
PID 2216 wrote to memory of 1828	2216	Dxpserver.exe	38
PID 2676 wrote to memory of 1616	2676	Dxpserver.exe	39
PID 2676 wrote to memory of 1616	2676	Dxpserver.exe	39
PID 2676 wrote to memory of 1616	2676	Dxpserver.exe	39
PID 2676 wrote to memory of 1616	2676	Dxpserver.exe	39
PID 2608 wrote to memory of 2828	2608	taskeng.exe	41
PID 2608 wrote to memory of 2828	2608	taskeng.exe	41
PID 2608 wrote to memory of 2828	2608	taskeng.exe	41
PID 2608 wrote to memory of 2828	2608	taskeng.exe	41
PID 2828 wrote to memory of 2168	2828	Dxpserver.exe	42
PID 2828 wrote to memory of 2168	2828	Dxpserver.exe	42
PID 2828 wrote to memory of 2168	2828	Dxpserver.exe	42
PID 2828 wrote to memory of 2168	2828	Dxpserver.exe	42
PID 2828 wrote to memory of 2168	2828	Dxpserver.exe	42
PID 2828 wrote to memory of 2168	2828	Dxpserver.exe	42
PID 2168 wrote to memory of 1244	2168	Dxpserver.exe	43
PID 2168 wrote to memory of 1244	2168	Dxpserver.exe	43
PID 2168 wrote to memory of 1244	2168	Dxpserver.exe	43
PID 2168 wrote to memory of 1244	2168	Dxpserver.exe	43

C:\Users\Admin\AppData\Local\Temp\b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe
"C:\Users\Admin\AppData\Local\Temp\b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2520
- C:\Users\Admin\AppData\Local\Temp\b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe
  "C:\Users\Admin\AppData\Local\Temp\b37515a937556813e10655784614631282a008ae49ab9d79ff8d4c24b9270ae0.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3012
- - 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:632
- 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:2892

C:\Windows\system32\taskeng.exe
taskeng.exe {96E97F8B-B66D-45B8-8A06-7C1C4F87AC9D} S-1-5-21-3290804112-2823094203-3137964600-1000:VORHPBAB\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2608
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2676
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2216
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:1828
- - 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
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1616
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2828
- - C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
    "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2168
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:1244

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry