Overview

overview

10

Static

static

1

CoreDefend...up.bat

windows10-2004-x64

10

CoreDefend...up.bat

windows11-21h2-x64

10

Sharing

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General

  • Target
    24052026_0250_CoreDefender_Antivirus_Setup.bat.zip
  • Size 2.7MB
  • Sample260524-dbr39saz3v
  • SHA256 b271093486b211721354b58acecd1859b29e076e4ce7f6d87bfb2e19556328ef
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
customerloaderquasarrtkaudioservicedefense_evasiondownloaderloaderpersistencespywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.6.6

Botnet

  • RtkAudioService

C2

  • 13.233.224.203:3001

Mutex

  • 5f0fa0a2-b9a3-49be-8ab2-3b125e3c4ec3

Attributes
  • encryption_key

    2FCC00E69AAE4F8C1204EDB127CA14A8751F73F7

  • install_name

    .exe

  • key_salt

    5a23f8394640cb9e40658446a04c0bbae82dc93d0470e1b2a406a90fd2520382

  • reconnect_delay

    3000

Targets

    • Target
      CoreDefender_Antivirus_Setup.bat
    • Size 5.1MB
    • SHA256 483bcf047c15e51fe1c167604b5ae8a822b8fee310ff8fd3c5c95ddfb805b2f1
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    rtkaudioservicedefense_evasiondownloadercustomerloaderquasarloaderpersistencespywaretrojan

    • Family: Customer Loader

      Customer Loader is a downloader written in C#.

      downloaderloadercustomerloader

    • Family: Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • UAC bypass

      defense_evasiontrojan

    • Badlisted process makes network request

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

    • Checks computer location settings

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

    • Drops startup file

    • Adds Run key to start application

      persistence
    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks