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Analysis

  • max time kernel
    148s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/01/2023, 11:15

General

  • Target

    ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe

  • Size

    471KB

  • MD5

    f4dfa2a79474f83952fb06cbefc3147a

  • SHA1

    201d5b03e66a4f43b757bb685ba60665c258b078

  • SHA256

    ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9

  • SHA512

    211981b2e4840eaa3c1d72ad46e08adbf147ad3700dfdd9fbef1eefbc8249a4a1c36ecdceeace913dd8abf0a27abfed2449f0e11c7df1ad280b2a26f85d6af46

  • SSDEEP

    6144:3LKPIsBiPVYkvO5OLRMIOeMqwCObQQkEf90gF8gHsAOZZZ1XzccXCm4:3LKP3QYkvOI9fOeVwCOcQvZsfZZ94

Malware Config

Extracted

Family

remcos

Botnet

worldclass

C2

91.193.75.188:60005

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    worldclass.exe

  • copy_folder

    worldclass

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-UPD1GY

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    worldclass

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Adds Run key to start application 2 TTPs 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
    "C:\Users\Admin\AppData\Local\Temp\ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4772
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\clquwqfuuojdouzgxj.vbs"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:4988
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4636
        • C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe
          C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetWindowsHookEx
          PID:2220

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\clquwqfuuojdouzgxj.vbs

    Filesize

    434B

    MD5

    a4a28eb230fc2e09b69530a935514936

    SHA1

    094116e18776a84014e76cfe46e0b21de5245fbe

    SHA256

    0e5fb1081178e158c0eeebc64c04edfd5692ced5fda83b963f7997c33c40e198

    SHA512

    365e872a428c0bd15bece5bd1014beeb4618cce6ea572df1c9100ba8a6048ed5dfc6be5ec7999272082097830bf8703312f267dc2a92bc7e4d8b63a72e27cf5f

  • C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe

    Filesize

    471KB

    MD5

    f4dfa2a79474f83952fb06cbefc3147a

    SHA1

    201d5b03e66a4f43b757bb685ba60665c258b078

    SHA256

    ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9

    SHA512

    211981b2e4840eaa3c1d72ad46e08adbf147ad3700dfdd9fbef1eefbc8249a4a1c36ecdceeace913dd8abf0a27abfed2449f0e11c7df1ad280b2a26f85d6af46

  • C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe

    Filesize

    471KB

    MD5

    f4dfa2a79474f83952fb06cbefc3147a

    SHA1

    201d5b03e66a4f43b757bb685ba60665c258b078

    SHA256

    ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9

    SHA512

    211981b2e4840eaa3c1d72ad46e08adbf147ad3700dfdd9fbef1eefbc8249a4a1c36ecdceeace913dd8abf0a27abfed2449f0e11c7df1ad280b2a26f85d6af46