Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    31-07-2024 23:29

General

  • Target

    b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe

  • Size

    3.1MB

  • MD5

    7c57eda4bef5b6a6f5ca084dde31deb7

  • SHA1

    8ed5f1f48691e8d3d5e910b1fd46d0ce0d30eb1e

  • SHA256

    b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62

  • SHA512

    22d5be1c470f673b7a89ccb972c9b907eb76a070246d071550d891d52d2e4eba2a14df6924b98e1d866ad216e02e3a7cc368f545a578dfe6eaffec461abefe5d

  • SSDEEP

    49152:ivjI22SsaNYfdPBldt698dBcjHHAek9hBvJGLoGdkTHHB72eh2NT:ivc22SsaNYfdPBldt6+dBcjH2h8

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

    Client.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 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\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe
    "C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2928
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2916
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2724
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2664

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    7c57eda4bef5b6a6f5ca084dde31deb7

    SHA1

    8ed5f1f48691e8d3d5e910b1fd46d0ce0d30eb1e

    SHA256

    b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62

    SHA512

    22d5be1c470f673b7a89ccb972c9b907eb76a070246d071550d891d52d2e4eba2a14df6924b98e1d866ad216e02e3a7cc368f545a578dfe6eaffec461abefe5d

  • memory/2724-7-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

    Filesize

    9.9MB

  • memory/2724-8-0x00000000012A0000-0x00000000015C4000-memory.dmp

    Filesize

    3.1MB

  • memory/2724-10-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

    Filesize

    9.9MB

  • memory/2724-11-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

    Filesize

    9.9MB

  • memory/2928-0-0x000007FEF5B93000-0x000007FEF5B94000-memory.dmp

    Filesize

    4KB

  • memory/2928-1-0x0000000001380000-0x00000000016A4000-memory.dmp

    Filesize

    3.1MB

  • memory/2928-2-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

    Filesize

    9.9MB

  • memory/2928-9-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

    Filesize

    9.9MB