Overview

overview

10

Static

static

10

MsDefender.exe

windows10-2004-x64

10

MsDefender.exe

windows11-21h2-x64

10

Sharing

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General

  • Target
    MsDefender.exe
  • Size 3.5MB
  • Sample260405-kfvtaact2q
  • SHA256 7e940a6a598353c3a3e784f66e64165e5d1359ba168090a280c8550a52a97b39
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
quasardefenderdiscoveryexecutionpersistencespywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • Defender

C2

  • fly8889.net:443

  • fly88bi.jp.net:443

  • open88-2.com :443

  • welcome2amway.com:443

Mutex

  • edb9632e-5121-4e6b-b6dd-6fe78816a3a1

Attributes
  • encryption_key

    2DA8E1B5D18EAA4561218BCAF7CC51C403CE73ED

  • install_name

    MsDefender.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender Service

  • subdirectory

    Microsoft

Targets

    • Target
      MsDefender.exe
    • Size 3.5MB
    • SHA256 7e940a6a598353c3a3e784f66e64165e5d1359ba168090a280c8550a52a97b39
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defenderdiscoveryexecutionquasarpersistencespywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar family

      quasar

    • Quasar payload

    • Checks computer location settings

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

    • Executes dropped EXE

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks