General

  • Target
    RC7.exe
  • Size 161KB
  • Sample260503-t2rs7adv9s
  • SHA256 e0be0a8c8c741e821bea2b66c2aea511e33da9aaf9199a30f6df4dd1ba36f980
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • remcos

Version
  • 3.8.0 Pro

Botnet
  • bazarai

C2
  • 23.132.164.14:5000

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    Runtime Broker.exe

  • copy_folder

    Microsoft

  • delete_file

    true

  • hide_file

    true

  • hide_keylog_file

    true

  • install_flag

    true

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    Xeno

  • mouse_option

    false

  • mutex

    Rmc-BLV8G5

  • screenshot_crypt

    false

  • screenshot_flag

    true

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Windows Security

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Extracted

Family
  • destiny_stealer

C2
  • 23.132.164.14

Attributes
  • port

    8888

Extracted

Family
  • remcos

Botnet
  • bazarai

C2
  • 23.132.164.14:5000

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    Runtime Broker.exe

  • copy_folder

    Microsoft

  • delete_file

    true

  • hide_file

    true

  • hide_keylog_file

    true

  • install_flag

    true

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    Xeno

  • mouse_option

    false

  • mutex

    Rmc-BLV8G5

  • screenshot_crypt

    false

  • screenshot_flag

    true

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Windows Security

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target
      RC7.exe
    • Size 161KB
    • SHA256 e0be0a8c8c741e821bea2b66c2aea511e33da9aaf9199a30f6df4dd1ba36f980
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Detect Xworm Payload

    • Family: Destiny Stealer

      DestinyStealer is a stealer written in C#.

    • Family: Remcos

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

    • Family: Xworm

      Xworm is a remote access trojan written in C#.

    • Suricata alert: REMCOS RAT Malware Inbound C2 Communication

      Network activity triggered a Suricata alert

    • Suricata alert: REMCOS RAT Malware Outbound C2 Communication

      Network activity triggered a Suricata alert

    • Detected Nirsoft tools

      Free utilities often used by attackers which can steal passwords, product keys, etc.

    • NirSoft EdgeCookiesView

      Password recovery tool for Microsoft Edge browser

    • NirSoft WebBrowserPassView

      Password recovery tool for various web browsers

    • Adds policy Run key to start application

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Uses browser remote debugging

      Can be used control the browser and steal sensitive information such as credentials and session cookies.

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Adds Run key to start application

    • Deobfuscate/Decode Files or Information

      Payload decoded via CertUtil.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v16

Tasks