remcos | 13641bd80132964e830b3961ccf6300358bfab5149aad32571998a98e2413db1

Analysis

max time kernel
142s
max time network
135s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
29-09-2024 19:43

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General

Target

Backdoor.exe
Size

36KB
MD5

70aadafbc88f381a60171fb21ae4e5ba
SHA1

e7cfd181af802976134b23177087ba5dcd518a64
SHA256

13641bd80132964e830b3961ccf6300358bfab5149aad32571998a98e2413db1
SHA512

19379c0379c5d186514be3faf5839315473d74abe2366f1067fef31fe82300b5f8cf507a58a6e70851e0cb5b76ba4713919ae626232806c953d40a1181146fa1
SSDEEP

768:yNnmZ/8vPlLUdhfJ8v6utFpVsuRregrWChgz/b7Dsr1:Unwu4DejVLyOhgz/Yr

Score

10^/10

remcos host discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

top-max.gl.at.ply.gg:65091

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
winka.exe
copy_folder
winled
delete_file
false
hide_file
false
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
methfsaf
keylog_path
%AppData%
mouse_option
false
mutex
remcos_wexxmpxcql
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Modifies WinLogon for persistence 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	winka.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	winka.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	Backdoor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	Backdoor.exe

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

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

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

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	Backdoor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	Backdoor.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	winka.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	winka.exe

Executes dropped EXE 1 IoCs

pid	Process
2992	winka.exe

Loads dropped DLL 2 IoCs

pid	Process
2872	cmd.exe
2872	cmd.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	Backdoor.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	winka.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	winka.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\winled\\winka.exe\""	Backdoor.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

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\	winka.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 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	Backdoor.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	winka.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.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
2728	PING.EXE

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
2868	reg.exe
2580	reg.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2728	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2992	winka.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2992	winka.exe

Suspicious use of WriteProcessMemory 35 IoCs

description	pid	Process	procid_target
PID 2372 wrote to memory of 2676	2372	Backdoor.exe	31
PID 2372 wrote to memory of 2676	2372	Backdoor.exe	31
PID 2372 wrote to memory of 2676	2372	Backdoor.exe	31
PID 2372 wrote to memory of 2676	2372	Backdoor.exe	31
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2372 wrote to memory of 2872	2372	Backdoor.exe	33
PID 2676 wrote to memory of 2868	2676	cmd.exe	34
PID 2676 wrote to memory of 2868	2676	cmd.exe	34
PID 2676 wrote to memory of 2868	2676	cmd.exe	34
PID 2676 wrote to memory of 2868	2676	cmd.exe	34
PID 2872 wrote to memory of 2728	2872	cmd.exe	36
PID 2872 wrote to memory of 2728	2872	cmd.exe	36
PID 2872 wrote to memory of 2728	2872	cmd.exe	36
PID 2872 wrote to memory of 2728	2872	cmd.exe	36
PID 2872 wrote to memory of 2992	2872	cmd.exe	37
PID 2872 wrote to memory of 2992	2872	cmd.exe	37
PID 2872 wrote to memory of 2992	2872	cmd.exe	37
PID 2872 wrote to memory of 2992	2872	cmd.exe	37
PID 2992 wrote to memory of 2576	2992	winka.exe	38
PID 2992 wrote to memory of 2576	2992	winka.exe	38
PID 2992 wrote to memory of 2576	2992	winka.exe	38
PID 2992 wrote to memory of 2576	2992	winka.exe	38
PID 2992 wrote to memory of 2584	2992	winka.exe	40
PID 2992 wrote to memory of 2584	2992	winka.exe	40
PID 2992 wrote to memory of 2584	2992	winka.exe	40
PID 2992 wrote to memory of 2584	2992	winka.exe	40
PID 2576 wrote to memory of 2580	2576	cmd.exe	41
PID 2576 wrote to memory of 2580	2576	cmd.exe	41
PID 2576 wrote to memory of 2580	2576	cmd.exe	41
PID 2576 wrote to memory of 2580	2576	cmd.exe	41

C:\Users\Admin\AppData\Local\Temp\Backdoor.exe
"C:\Users\Admin\AppData\Local\Temp\Backdoor.exe"
1⤵
- Modifies WinLogon for persistence
- Adds policy Run key to start application
- Adds Run key to start application
- Modifies WinLogon
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2372
- 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:2676
- - 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:2868
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2872
- - 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:2728
- - C:\Users\Admin\AppData\Roaming\winled\winka.exe
    "C:\Users\Admin\AppData\Roaming\winled\winka.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Adds policy Run key to start application
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2992
  - - 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
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2576
    - - 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
        5⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:2580
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
      4⤵
      PID:2584

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

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

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
98B

MD5
c3cd37a13560b4e4fc8a784bd5374dd8

SHA1
30cc56aee22b8a29cbda43c6e340311a63e98196

SHA256
3b3369170ba92a3d38b5ad0106eed53e58f32aa70fdcc4fac0b7047019474104

SHA512
5b36df4e1b7764168ea72048134eaa0933cb0511febd2d89cb5aa1d0b6f35c7cb5fadfcf205e37c96f200fd0c5b9eaff592248d17b93300a29581e2c5bf05679

Download Submit
\Users\Admin\AppData\Roaming\winled\winka.exe

Filesize
36KB

MD5
70aadafbc88f381a60171fb21ae4e5ba

SHA1
e7cfd181af802976134b23177087ba5dcd518a64

SHA256
13641bd80132964e830b3961ccf6300358bfab5149aad32571998a98e2413db1

SHA512
19379c0379c5d186514be3faf5839315473d74abe2366f1067fef31fe82300b5f8cf507a58a6e70851e0cb5b76ba4713919ae626232806c953d40a1181146fa1

Download Submit
memory/2372-0-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2372-11-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2872-14-0x0000000000150000-0x000000000016B000-memory.dmp

Filesize
108KB

Download
memory/2992-25-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-27-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-22-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-23-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-24-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-20-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-26-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-21-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-28-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-29-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-30-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-31-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-32-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-33-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/2992-34-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download