Overview

overview

10

Static

static

10

Client-built.exe

windows10-2004-x64

10

Client-built.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample260803-sf66baseka
  • SHA256 db2dab1737a1c4fb319facfc5762d11e1a898ebc52e2d587123273aceab819eb
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
quasaroffice04discoveryexecutionspywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • Office04

C2

  • 172.111.134.94:4782

Mutex

  • bce5a84f-00ac-4478-9b5f-f88136388035

Attributes
  • encryption_key

    4007C7F5BE6F76DE717640B65A04C8074D917CE5

  • install_name

    Client.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Targets

    • Target
      Client-built.exe
    • Size 3.1MB
    • SHA256 db2dab1737a1c4fb319facfc5762d11e1a898ebc52e2d587123273aceab819eb
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    office04discoveryexecutionquasarspywaretrojan

    • Family: Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Checks computer location settings

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

    • Looks up external IP address via web service

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

      discovery
    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks