Overview

overview

10

Static

static

10

f9cd91aa04...c2.exe

windows7-x64

10

f9cd91aa04...c2.exe

windows10-2004-x64

10

Sharing

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General

  • Target
    f9cd91aa04919e9fe878fad738f5c8631f229da474552a245b29f0649fad96c2.exe
  • Size 3.1MB
  • Sample240319-dk37wsfh63
  • SHA256 f9cd91aa04919e9fe878fad738f5c8631f229da474552a245b29f0649fad96c2
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • Office04

C2

  • authapi-41985.portmap.host:41985

Mutex

  • 50fd280e-bda2-413a-9ebd-86236f4b0beb

Attributes
  • encryption_key

    E429F24E279E8B25742D0F5347151B0F90D031CA

  • install_name

    system.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    system

  • subdirectory

    SubDir

Targets

    • Target
      f9cd91aa04919e9fe878fad738f5c8631f229da474552a245b29f0649fad96c2.exe
    • Size 3.1MB
    • SHA256 f9cd91aa04919e9fe878fad738f5c8631f229da474552a245b29f0649fad96c2
    • MD5 SHA1 SHA512 SSDEEP
    Score
    10/10
    quasaroffice04spywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Detects Windows executables referencing non-Windows User-Agents

    • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

    • Detects executables containing common artifacts observed in infostealers

    • Checks computer location settings

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

    • Executes dropped EXE

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Enterprise v15

Tasks