Overview

overview

10

Static

static

3

Build.exe

windows7-x64

6

Build.exe

windows10-2004-x64

10

Sharing

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General

  • Target
    Build.exe
  • Size 15KB
  • Sample240529-jldxaafe2t
  • SHA256 abe621c37b2e40f6c6b3d9da15e37d4001188e10bac99e5d66c23cee23b98d03
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
quasaroffice04executionspywarestealertrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • Office04

C2

  • 31.177.108.29:4782

Mutex

  • 553dcf2c-4c70-4c0c-935a-2e078a46f03e

Attributes
  • encryption_key

    DAFF70D249B4EC619D5A052FDD3418E3549FF268

  • install_name

    KR6nDu9fLhop1bFe.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Defender.Process

  • subdirectory

    SubDir

Targets

    • Target
      Build.exe
    • Size 15KB
    • SHA256 abe621c37b2e40f6c6b3d9da15e37d4001188e10bac99e5d66c23cee23b98d03
    • MD5 SHA1 SHA512 SSDEEP
    Score
    10/10
    quasaroffice04executionspywarestealertrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

      execution

    • Downloads MZ/PE file

    • Checks computer location settings

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

    • Executes dropped EXE

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

      spywarestealer

    • Accesses cryptocurrency files/wallets, possible credential harvesting

      spyware

    • Looks up external IP address via web service

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

    behavioral1behavioral2

MITRE ATT&CK Enterprise v15

Tasks