Overview

overview

10

Static

static

10

Client-built.exe

windows10-1703-x64

10

Client-built.exe

windows10-2004-x64

10

Client-built.exe

windows11-21h2-x64

10

Sharing

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General

  • Target
    Client-built.exe
  • Size 348KB
  • Sample240325-p69scabc4v
  • SHA256 1e7d5bd9d85650996c6576118409b53d0c677e4035baa3f4d2641d5e9a0b16f9
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
quasaroffice04persistencespywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.3.0.0

Botnet

  • Office04

C2

  • Vallithebest-32755.portmap.host:32755

Mutex

  • QSR_MUTEX_3gXoc7Rbb6gDK9k7Ha

Attributes
  • encryption_key

    NZgldVKwqeCAFECpbpDa

  • install_name

    WindowsSound.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    AuthClient.exe

  • subdirectory

    SubDir

Targets

    • Target
      Client-built.exe
    • Size 348KB
    • SHA256 1e7d5bd9d85650996c6576118409b53d0c677e4035baa3f4d2641d5e9a0b16f9
    • MD5 SHA1 SHA512 SSDEEP
    Score
    10/10
    quasaroffice04spywaretrojanpersistence

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Executes dropped EXE

    • Adds Run key to start application

      persistence

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    behavioral1behavioral2behavioral3

MITRE ATT&CK Enterprise v15

Tasks