General

  • Target
    Nlbrute x32.exe
  • Size 8.3MB
  • Sample240113-fb13aaccbq
  • SHA256 ec9ac12934cb6fddd85e526a88f43557d65f4ce109903c98ba7e00b9aad25d76
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.3.0.0

Botnet
  • Office04

C2
  • trantienratvip.ddns.net:4782

Mutex
  • QSR_MUTEX_XG5QWPg5EAuaozWcYa

Attributes
  • encryption_key

    JrQ3qCfRyagmbeFXSbbj

  • install_name

    NLbrute.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Targets

    • Target
      Nlbrute x32.exe
    • Size 8.3MB
    • SHA256 ec9ac12934cb6fddd85e526a88f43557d65f4ce109903c98ba7e00b9aad25d76
    • MD5 SHA1 SHA512 SSDEEP
    • Detect Neshta payload

    • Neshta

      Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Identifies Wine through registry keys

      Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

    • Loads dropped DLL

    • Modifies system executable filetype association

    • Reads user/profile data of web browsers

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

    • Looks up external IP address via web service

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

    • Suspicious use of NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Enterprise v15

Tasks