Analysis

  • max time kernel
    126s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240730-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-07-2024 23:53

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    b45a77a2cdaca1dbaf0ebeec34178a95

  • SHA1

    4b43a29635df7b060ec3c7696c45446bf37c8150

  • SHA256

    76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c

  • SHA512

    cdfbe90b1ad02b69a5bfcb577d1cd8c12d055df2e370716d0faccf65364edecf5c8103f55355daa11a8d845a24d453b78c6e49f06242043ffa1a0a9d8e7d052d

  • SSDEEP

    49152:Dv+lL26AaNeWgPhlmVqvMQ7XSKeCxNESErk/i8LoGdlETHHB72eh2NT:DvuL26AaNeWgPhlmVqkQ7XSKrxaC

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.28:4782

Mutex

180b92ba-98f1-484b-b54f-264758c8d7f4

Attributes
  • encryption_key

    E2AD968D101B25448614267CCA174D53CE1050BA

  • install_name

    BootstrapperV1.11.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    BootstrapperV1.11

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 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 6 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3412
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1812
    • C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2112
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4724

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe

    Filesize

    3.1MB

    MD5

    b45a77a2cdaca1dbaf0ebeec34178a95

    SHA1

    4b43a29635df7b060ec3c7696c45446bf37c8150

    SHA256

    76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c

    SHA512

    cdfbe90b1ad02b69a5bfcb577d1cd8c12d055df2e370716d0faccf65364edecf5c8103f55355daa11a8d845a24d453b78c6e49f06242043ffa1a0a9d8e7d052d

  • memory/2112-8-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

    Filesize

    10.8MB

  • memory/2112-10-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

    Filesize

    10.8MB

  • memory/2112-11-0x000000001BBC0000-0x000000001BC10000-memory.dmp

    Filesize

    320KB

  • memory/2112-12-0x000000001BCD0000-0x000000001BD82000-memory.dmp

    Filesize

    712KB

  • memory/2112-13-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

    Filesize

    10.8MB

  • memory/3412-0-0x00007FFA02D43000-0x00007FFA02D45000-memory.dmp

    Filesize

    8KB

  • memory/3412-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp

    Filesize

    3.1MB

  • memory/3412-2-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

    Filesize

    10.8MB

  • memory/3412-9-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

    Filesize

    10.8MB