remcos | 41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532

Analysis

max time kernel
149s
max time network
149s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
17-09-2024 21:58

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General

Target

remcos_a.exe
Size

469KB
MD5

07b3653e412ef63f2fccef7b404197e8
SHA1

a5b8e29f8b6bbf1e10ab049083b0f214e958edfe
SHA256

41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532
SHA512

dc088419aa3c9fb47d0ed7f318f44d51f84e82525c215ebd66ffc9c68b30410b02c38af4363e4a75838124c57e45f2c7fcad222def30a688d21f90d053696a97
SSDEEP

12288:umnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSwn9:WiLJbpI7I2WhQqZ7w9

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

accessories-retrieve.gl.at.ply.gg:9999

accessories-retrieve.gl.at.ply.gg:13970

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-GWSYNB
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	remcos_a.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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos_a.exe

Deletes itself 1 IoCs

pid	Process
2400	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
2388	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2116	cmd.exe
2116	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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	remcos_a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\remcos.exe\""	remcos_a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\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

Drops file in System32 directory 3 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2388 set thread context of 2868	2388	remcos.exe	41

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	remcos_a.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
2452	reg.exe
2864	reg.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2388	remcos.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2388	remcos.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2388	remcos.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 2096 wrote to memory of 2040	2096	remcos_a.exe	30
PID 2096 wrote to memory of 2040	2096	remcos_a.exe	30
PID 2096 wrote to memory of 2040	2096	remcos_a.exe	30
PID 2096 wrote to memory of 2040	2096	remcos_a.exe	30
PID 2040 wrote to memory of 2452	2040	cmd.exe	32
PID 2040 wrote to memory of 2452	2040	cmd.exe	32
PID 2040 wrote to memory of 2452	2040	cmd.exe	32
PID 2040 wrote to memory of 2452	2040	cmd.exe	32
PID 2096 wrote to memory of 2400	2096	remcos_a.exe	33
PID 2096 wrote to memory of 2400	2096	remcos_a.exe	33
PID 2096 wrote to memory of 2400	2096	remcos_a.exe	33
PID 2096 wrote to memory of 2400	2096	remcos_a.exe	33
PID 2400 wrote to memory of 2116	2400	WScript.exe	34
PID 2400 wrote to memory of 2116	2400	WScript.exe	34
PID 2400 wrote to memory of 2116	2400	WScript.exe	34
PID 2400 wrote to memory of 2116	2400	WScript.exe	34
PID 2116 wrote to memory of 2388	2116	cmd.exe	36
PID 2116 wrote to memory of 2388	2116	cmd.exe	36
PID 2116 wrote to memory of 2388	2116	cmd.exe	36
PID 2116 wrote to memory of 2388	2116	cmd.exe	36
PID 2388 wrote to memory of 2276	2388	remcos.exe	37
PID 2388 wrote to memory of 2276	2388	remcos.exe	37
PID 2388 wrote to memory of 2276	2388	remcos.exe	37
PID 2388 wrote to memory of 2276	2388	remcos.exe	37
PID 2276 wrote to memory of 2864	2276	cmd.exe	40
PID 2276 wrote to memory of 2864	2276	cmd.exe	40
PID 2276 wrote to memory of 2864	2276	cmd.exe	40
PID 2276 wrote to memory of 2864	2276	cmd.exe	40
PID 2388 wrote to memory of 2868	2388	remcos.exe	41
PID 2388 wrote to memory of 2868	2388	remcos.exe	41
PID 2388 wrote to memory of 2868	2388	remcos.exe	41
PID 2388 wrote to memory of 2868	2388	remcos.exe	41
PID 2388 wrote to memory of 2868	2388	remcos.exe	41

C:\Users\Admin\AppData\Local\Temp\remcos_a.exe
"C:\Users\Admin\AppData\Local\Temp\remcos_a.exe"
1⤵
- Adds policy Run key to start application
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2096
- 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:2040
- - 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:2452
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2400
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\Remcos\remcos.exe"
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2116
  - - C:\Windows\SysWOW64\Remcos\remcos.exe
      C:\Windows\SysWOW64\Remcos\remcos.exe
      4⤵
      Adds policy Run key to start application
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of FindShellTrayWindow
      Suspicious use of SendNotifyMessage
      Suspicious use of WriteProcessMemory
      PID:2388
    - - 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
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2276
      - 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
        6⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:2864
    - - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        5⤵
        
        PID:2868

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

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

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

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
524B

MD5
b1f4781fd733a072dc90cb33cbc4cf84

SHA1
1a51b1331cd0de3927f93ca560171b8adf8365fb

SHA256
1d155a5cfd1408551d55bd01576363aa24916690aeae54542dd22759d97dea61

SHA512
c5442c0688e7b8efb318561538076d150047c6e1a1cf1577bdb1b1eac4529f09306d7a5027858e42b72559258244c8b9630f812c71b1887e8b0f76a7dd9c617e

Download Submit
C:\Windows\SysWOW64\Remcos\remcos.exe

Filesize
469KB

MD5
07b3653e412ef63f2fccef7b404197e8

SHA1
a5b8e29f8b6bbf1e10ab049083b0f214e958edfe

SHA256
41cc93f0e27a97c5a5d6b0e5518fefb39d4cd00e3d8d1c6dc7a84c019099e532

SHA512
dc088419aa3c9fb47d0ed7f318f44d51f84e82525c215ebd66ffc9c68b30410b02c38af4363e4a75838124c57e45f2c7fcad222def30a688d21f90d053696a97

Download Submit
memory/2868-12-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/2868-11-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/2868-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads