Overview

overview

10

Static

static

10

quasar-client.exe

windows11-21h2-x64

10

Sharing

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General

  • Target
    quasar-client.exe
  • Size 3.1MB
  • Sample240416-e3cy4abd3v
  • SHA256 3f94db1997a60d4266e9d41fafdca52782b4ec6b2df3ec03f856beccd1a67e8e
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
quasarstarcommandclientdiscoveryevasionspywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • StarCommandClient

C2

  • ddns.ilovemyauntie.com:4782

  • 172.26.182.42:4782

  • 192.168.50.58:4782

Mutex

  • a8988113-ae09-400a-8285-0eb01972eddc

Attributes
  • encryption_key

    53525C30BFB8A559EF1ABF980C8E02CBE6DE175D

  • install_name

    Client.exe

  • log_directory

    $77-Logs

  • reconnect_delay

    1000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Targets

    • Target
      quasar-client.exe
    • Size 3.1MB
    • SHA256 3f94db1997a60d4266e9d41fafdca52782b4ec6b2df3ec03f856beccd1a67e8e
    • MD5 SHA1 SHA512 SSDEEP
    Score
    10/10
    quasarstarcommandclientdiscoveryevasionspywaretrojan

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Blocklisted process makes network request

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Windows Firewall

      evasion

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

      discovery

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Drops file in System32 directory

    behavioral1

MITRE ATT&CK Enterprise v15

Tasks