remcos | 3e4f9302ae461234c85684a38be6319145799717a6ef50004fc55f5b22cf42cf

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
30-12-2024 00:05

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General

Target

4492030951.exe
Size

463KB
MD5

56cf2e34e8c4b39d3ecb18935a1e96df
SHA1

d7cddc46a566dffff1a808526f48c96ef4b64302
SHA256

e1bd512161ccc65e6dd85edda13d9b97d96867d8c45dbce407f7455d8f12a90c
SHA512

387bb997d64d5d6c38b5e9854ad595860bb482eab3df7064676fbccb8943326dbc9b8166d412d5750a7792ea6eb9f35526b8f7e76f811dd4bcf2ac3fc66ccc2c
SSDEEP

12288:uegN0jfYLclGb0bVT6e+MT2MffZS/ghSYo:QNywLclGIeMT2MXZRhSV

Score

10^/10

remcos luder discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

3.3.2 Pro

Botnet

Luder

31.220.44.253:5222

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
%UserProfile%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
h908hn+0938g3-Y4186N
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
svchost
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
notepad;solitaire;

Signatures

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

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	4492030951.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
3196	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4132	remcos.exe

Adds Run key to start application 2 TTPs 2 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\svchost = "\"C:\\Users\\Admin\\remcos\\remcos.exe\""	4492030951.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4132 set thread context of 2300	4132	remcos.exe	92

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4492030951.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	4492030951.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
1856	reg.exe
2328	reg.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 224	4932	4492030951.exe	83
PID 4932 wrote to memory of 224	4932	4492030951.exe	83
PID 4932 wrote to memory of 224	4932	4492030951.exe	83
PID 224 wrote to memory of 1856	224	cmd.exe	85
PID 224 wrote to memory of 1856	224	cmd.exe	85
PID 224 wrote to memory of 1856	224	cmd.exe	85
PID 4932 wrote to memory of 3196	4932	4492030951.exe	86
PID 4932 wrote to memory of 3196	4932	4492030951.exe	86
PID 4932 wrote to memory of 3196	4932	4492030951.exe	86
PID 3196 wrote to memory of 1916	3196	WScript.exe	87
PID 3196 wrote to memory of 1916	3196	WScript.exe	87
PID 3196 wrote to memory of 1916	3196	WScript.exe	87
PID 1916 wrote to memory of 4132	1916	cmd.exe	89
PID 1916 wrote to memory of 4132	1916	cmd.exe	89
PID 1916 wrote to memory of 4132	1916	cmd.exe	89
PID 4132 wrote to memory of 3812	4132	remcos.exe	90
PID 4132 wrote to memory of 3812	4132	remcos.exe	90
PID 4132 wrote to memory of 3812	4132	remcos.exe	90
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 4132 wrote to memory of 2300	4132	remcos.exe	92
PID 3812 wrote to memory of 2328	3812	cmd.exe	93
PID 3812 wrote to memory of 2328	3812	cmd.exe	93
PID 3812 wrote to memory of 2328	3812	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\4492030951.exe
"C:\Users\Admin\AppData\Local\Temp\4492030951.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4932
- 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:224
- - 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:1856
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3196
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\remcos\remcos.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1916
  - - C:\Users\Admin\remcos\remcos.exe
      C:\Users\Admin\remcos\remcos.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4132
    - - 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:3812
      - 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:2328
    - - C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        5⤵
        
        PID:2300

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

Query Registry

T1012

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
518B

MD5
041f69d38a1a0ba68bd17bd7f14a64a2

SHA1
e67f0e3a465ec9896aa8feb4ed46a5dc235d67db

SHA256
19ba1d8894f20c95629c17fbbae7c3a8e3275f7bb21c8a9ec1d7a8e1a4c162a3

SHA512
dcea0330d73c3fe0b3504594a673beb78e870533efb6509a90d35e66870e195ddb2eb9341ccc9badb839e0e0f7fd7763e9365539c1db5693e7dfe5e18187c347

Download Submit
C:\Users\Admin\remcos\remcos.exe

Filesize
463KB

MD5
56cf2e34e8c4b39d3ecb18935a1e96df

SHA1
d7cddc46a566dffff1a808526f48c96ef4b64302

SHA256
e1bd512161ccc65e6dd85edda13d9b97d96867d8c45dbce407f7455d8f12a90c

SHA512
387bb997d64d5d6c38b5e9854ad595860bb482eab3df7064676fbccb8943326dbc9b8166d412d5750a7792ea6eb9f35526b8f7e76f811dd4bcf2ac3fc66ccc2c

Download Submit
memory/2300-9-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2300-10-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads