remcos | 8253bb236e315f60240304ac4c749e59e813399968562deddd692523bcb10b08

Analysis

max time kernel
150s
max time network
126s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
04/08/2026, 09:09

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General

Target
Shipping Doccument_XLS.js
Size 170KB
Sample260804-k4rrjagf49
SHA256 8253bb236e315f60240304ac4c749e59e813399968562deddd692523bcb10b08
MD5 bcdf633c54f64e3634cfb10ed9324e13
SHA1 dc833d58f84c0c21747098a6c475a3527d063d39
SHA512 a993893b6ca446804a097469e7822cb6b304ace3f18ecc2972cf65b920b2b61128d0b6255b1f4d1aa338caffda7cc76a17a73ab84fbf2ea67ef113af66594d7a
SSDEEP 3072:h/YDYF3gnjXJQUYhDB3RiMHj2flwk9muUoMhItZi+XvFd:BwYF3XUK3N6u2muUoMhgw+Xvv
TLSH
T1EA04BF855B481BF8FB2C0744D1AF544A62F2A726FB21A74AFD7332E36E37640907949C
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

error505 discovery execution remcos persistence rat

Malware Config

Extracted

Family

remcos

Version

7.2.6 Pro

Botnet

Error505

161.248.179.182:37171

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
vvlc
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-76HB0K
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Badlisted process makes network request 1 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
6	1584	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
2948	remcos.exe

Registers new Windows logon scripts automatically executed at logon. 1 TTPs 1 IoCs

persistence

Logon Script (Windows)

T1037.001

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3611646547-550105268-947503007-1000\Environment\UserInitMprLogonScript = "\"C:\\Windows\\system32\\wscript.exe\" \"C:\\Users\\Admin\\AppData\\Local\\Microsoft\\Windows\\v9955\\v7904.js\""	powershell.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\USER\S-1-5-21-3611646547-550105268-947503007-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-76HB0K = "\"C:\\ProgramData\\vvlc\\remcos.exe\""	powershell.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-76HB0K = "\"C:\\ProgramData\\vvlc\\remcos.exe\""	powershell.exe

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4268	cmd.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
2936	wscript.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1584	powershell.exe
1584	powershell.exe
2948	remcos.exe
2948	remcos.exe
2948	remcos.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1584	powershell.exe
Token: SeDebugPrivilege	2948	remcos.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2936 wrote to memory of 3168	2936	wscript.exe	89
PID 3168 wrote to memory of 3104	3168	conhost.exe	90
PID 3104 wrote to memory of 4268	3104	conhost.exe	91
PID 4268 wrote to memory of 4964	4268	cmd.exe	92
PID 4268 wrote to memory of 1584	4268	cmd.exe	93
PID 1584 wrote to memory of 2948	1584	powershell.exe	95

C:\Windows\system32\wscript.exe
wscript.exe "C:\Users\Admin\AppData\Local\Temp\Shipping Doccument_XLS.js"
1⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious use of WriteProcessMemory
PID:2936
- C:\Windows\System32\conhost.exe
  "C:\Windows\System32\conhost.exe" --headless conhost.exe --headless cmd.exe /c "echo $ExecutionContext.InvokeCommand.InvokeScript([Environment]::GetEnvironmentVariable('CITCURRKdo0','Process'))| powershell.exe -w H -nOP -noNi -"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3168
- - C:\Windows\System32\conhost.exe
    conhost.exe --headless cmd.exe /c "echo $ExecutionContext.InvokeCommand.InvokeScript([Environment]::GetEnvironmentVariable('CITCURRKdo0','Process'))| powershell.exe -w H -nOP -noNi -"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3104
  - - C:\Windows\System32\cmd.exe
      cmd.exe /c "echo $ExecutionContext.InvokeCommand.InvokeScript([Environment]::GetEnvironmentVariable('CITCURRKdo0','Process'))| powershell.exe -w H -nOP -noNi -"
      4⤵
      Executes a command shell one-liner
      Suspicious use of WriteProcessMemory
      PID:4268
    - - C:\Windows\system32\cmd.exe
        
        C:\Windows\system32\cmd.exe /S /D /c" echo $ExecutionContext.InvokeCommand.InvokeScript([Environment]::GetEnvironmentVariable('CITCURRKdo0','Process'))"
        5⤵
        
        PID:4964
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        powershell.exe -w H -nOP -noNi -
        5⤵
        Badlisted process makes network request
        Registers new Windows logon scripts automatically executed at logon.
        Adds Run key to start application
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1584
      - C:\ProgramData\vvlc\remcos.exe
        
        "C:\ProgramData\vvlc\remcos.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2948

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

JavaScript

T1059.007

Windows Command Shell

T1059.003

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Boot or Logon Initialization Scripts

T1037

Logon Script (Windows)

T1037.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Boot or Logon Initialization Scripts

T1037

Logon Script (Windows)

T1037.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

remcos.exe

Path C:\ProgramData\vvlc\remcos.exe
Size 444KB
SHA256 d3b4b97c2bf97d70e5655ff4c4ca1d8cef9ded51685cfd764247cfda98ee68df
MD5 909a2eec5534f01dff87b7d47e57bff7
SHA1 bb26646b094923f080fc2f2ba363c4c28b33dc07
SHA512 5b5b632eb93d227f81960916d13dd98c6f9cb0494866ceb324e6146254818f323537c39c2b90abc6496aad4b457c0b9b393301ea51157e9f823bd4cd442371dc
SSDEEP 6144:wCo5Sh1yzMWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzqO:w6pW2KXzJ4pdd3klnnWosPhnzq
TLSH
T1C5A45A876BD412D5EC3EC435C82344520721BCB9D791A7EB9AD8F2390E712D09E3EA67
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1584-12-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-15-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-5-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-0-0x00007FFB6931F000-0x00007FFB69320000-memory.dmp

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memory/1584-7-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-8-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-9-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-10-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-2-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-11-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-6-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-14-0x0000024D1B670000-0x0000024D1B682000-memory.dmp

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memory/1584-13-0x0000024D1B6A0000-0x0000024D1B6F4000-memory.dmp

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memory/1584-16-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/1584-17-0x0000024D1C330000-0x0000024D1C3DB000-memory.dmp

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memory/1584-20-0x0000024D1C330000-0x0000024D1C3DB000-memory.dmp

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memory/1584-1-0x0000024D1B3E0000-0x0000024D1B402000-memory.dmp

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memory/1584-21-0x00007FFB69190000-0x00007FFB69B34000-memory.dmp

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memory/2948-24-0x000001A9CEE50000-0x000001A9CEE98000-memory.dmp

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