Analysis

  • max time kernel
    4s
  • max time network
    8s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    04-08-2024 12:00

General

  • Target

    qqsarbuilder.exe

  • Size

    3.1MB

  • MD5

    ea1ab6ce5932a3718821475f19feefea

  • SHA1

    5ab97ce62532976abd93ed2cf56662b8ec15606c

  • SHA256

    27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048

  • SHA512

    e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838

  • SSDEEP

    49152:fvSI22SsaNYfdPBldt698dBcjHvSZxNESEJk/ijLoGdLqiTHHB72eh2NT:fv/22SsaNYfdPBldt6+dBcjHvUxAv7

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.174.129:4782

Mutex

4642d254-5910-430f-8e8f-b944ab72b6fd

Attributes
  • encryption_key

    F0F78B2B4A3D25098C1C1557DC99FDA4D204F27D

  • install_name

    windwsupdater.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    windwsupdater

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe
    "C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2708
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2240
    • C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2880
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2624

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe

    Filesize

    3.1MB

    MD5

    ea1ab6ce5932a3718821475f19feefea

    SHA1

    5ab97ce62532976abd93ed2cf56662b8ec15606c

    SHA256

    27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048

    SHA512

    e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838

  • memory/2708-0-0x000007FEF53D3000-0x000007FEF53D4000-memory.dmp

    Filesize

    4KB

  • memory/2708-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp

    Filesize

    3.1MB

  • memory/2708-2-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

    Filesize

    9.9MB

  • memory/2708-10-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

    Filesize

    9.9MB

  • memory/2880-8-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

    Filesize

    9.9MB

  • memory/2880-9-0x0000000000FC0000-0x00000000012E4000-memory.dmp

    Filesize

    3.1MB

  • memory/2880-11-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

    Filesize

    9.9MB