remcos | f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea

Analysis

max time kernel
16s
max time network
16s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
02-01-2025 01:54

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General

Target

f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Size

92KB
MD5

76588f4bc306a7adbea175dfbdd9b0bb
SHA1

e4d32b94becf0a27194eddefd3acb709924175de
SHA256

f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea
SHA512

f1a7d5a18da82c25a1c8be319b52e5997f8e9ca45a2b07f6ab173dbe578ba3f4d81de5ad7d1633a324798260bd6342ee9ffbbfeac155d52bd1c1f98e7ef44b1c
SSDEEP

1536:4hhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6vre:ehzYTGWVvJ8f2v1TbPzuMsIFSHNThy+H

Score

10^/10

remcos host discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

nhatde0166-47406.portmap.host:47406

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
remcos.exe
copy_folder
remcos
delete_file
true
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%WinDir%\System32
mouse_option
false
mutex
remcos_whmmzkguja
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:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
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	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe

Deletes itself 1 IoCs

pid	Process
2360	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
1952	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2360	cmd.exe
2360	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\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.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\	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	remcos.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\remcos\remcos.exe	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
File opened for modification	C:\Windows\SysWOW64\remcos	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
File created	C:\Windows\SysWOW64\remcos\remcos.exe	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1952 set thread context of 1980	1952	remcos.exe	37

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	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.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	remcos.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
2948	PING.EXE

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
2900	reg.exe
1956	reg.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2948	PING.EXE

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 2112	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	28
PID 2384 wrote to memory of 2112	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	28
PID 2384 wrote to memory of 2112	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	28
PID 2384 wrote to memory of 2112	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	28
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2384 wrote to memory of 2360	2384	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	30
PID 2112 wrote to memory of 2900	2112	cmd.exe	32
PID 2112 wrote to memory of 2900	2112	cmd.exe	32
PID 2112 wrote to memory of 2900	2112	cmd.exe	32
PID 2112 wrote to memory of 2900	2112	cmd.exe	32
PID 2360 wrote to memory of 2948	2360	cmd.exe	33
PID 2360 wrote to memory of 2948	2360	cmd.exe	33
PID 2360 wrote to memory of 2948	2360	cmd.exe	33
PID 2360 wrote to memory of 2948	2360	cmd.exe	33
PID 2360 wrote to memory of 1952	2360	cmd.exe	34
PID 2360 wrote to memory of 1952	2360	cmd.exe	34
PID 2360 wrote to memory of 1952	2360	cmd.exe	34
PID 2360 wrote to memory of 1952	2360	cmd.exe	34
PID 1952 wrote to memory of 1248	1952	remcos.exe	35
PID 1952 wrote to memory of 1248	1952	remcos.exe	35
PID 1952 wrote to memory of 1248	1952	remcos.exe	35
PID 1952 wrote to memory of 1248	1952	remcos.exe	35
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1952 wrote to memory of 1980	1952	remcos.exe	37
PID 1248 wrote to memory of 1956	1248	cmd.exe	38
PID 1248 wrote to memory of 1956	1248	cmd.exe	38
PID 1248 wrote to memory of 1956	1248	cmd.exe	38
PID 1248 wrote to memory of 1956	1248	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
"C:\Users\Admin\AppData\Local\Temp\f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe"
1⤵
- Modifies WinLogon for persistence
- Adds policy Run key to start application
- Adds Run key to start application
- Modifies WinLogon
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2384
- 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:2112
- - 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:2900
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - Deletes itself
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2360
- - 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:2948
- - C:\Windows\SysWOW64\remcos\remcos.exe
    "C:\Windows\SysWOW64\remcos\remcos.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Adds policy Run key to start application
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1952
  - - 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:1248
    - - 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:1956
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
      4⤵
      PID:1980

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
198B

MD5
e6d737e4b326823697a567993c761d2a

SHA1
000c8a205fb1d37f10e9899257024615551b2301

SHA256
8c98c41dcde13523a984d5bec113efd09f6d290839db2f3f97afa4381ceda7ee

SHA512
3bb3e14f35078b52f5689975aeef5752e2f15ef082fc98e043d1458323638c05166202e1e722a35bb8d41403d142322ab422f148e7651acce1d93c8beeb174fa

Download Submit
\Windows\SysWOW64\remcos\remcos.exe

Filesize
92KB

MD5
76588f4bc306a7adbea175dfbdd9b0bb

SHA1
e4d32b94becf0a27194eddefd3acb709924175de

SHA256
f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea

SHA512
f1a7d5a18da82c25a1c8be319b52e5997f8e9ca45a2b07f6ab173dbe578ba3f4d81de5ad7d1633a324798260bd6342ee9ffbbfeac155d52bd1c1f98e7ef44b1c

Download Submit
memory/1980-15-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads