Analysis

  • max time kernel
    127s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-09-2024 11:31

General

  • Target

    NordUpdateService.exe

  • Size

    290KB

  • MD5

    c59d83ce3b43dd07757910b4c1694b40

  • SHA1

    7671aad5be051ef18ecd733c36ad58edb8a98297

  • SHA256

    e99fd45109ffdf65e427a60c6846aa7adc6da833a97273ae99c7f6dcade0f7ca

  • SHA512

    aac5b5c549f47ffbafac11a8f132d5202e9edf4389c4a4d25b569f7031c898e5aa490d8a56d4b4db5644ffc0d54d3e76492eec775b5ce3352a60c31b949570af

  • SSDEEP

    6144:6l6M+7sKsTuI8jJo5JFVVsPzTCH2oEN35:6l6fsTuO5JFArTCIJ

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

94.156.69.32:4782

Mutex

50380dde-34ad-4717-969f-5435a90bc9c0

Attributes
  • encryption_key

    34E5AD2D21D24289CCD1651CD4CE56F37B65DB13

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\NordUpdateService.exe
    "C:\Users\Admin\AppData\Local\Temp\NordUpdateService.exe"
    1⤵
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:1536
    • C:\Windows\SYSTEM32\RuntimeBroker.exe
      RuntimeBroker.exe
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2696

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/1536-27-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-30-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-18-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-17-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-29-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-22-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-23-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-16-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-28-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/1536-24-0x000000006E900000-0x000000006E9E1000-memory.dmp

    Filesize

    900KB

  • memory/2696-34-0x000002757AC10000-0x000002757AC60000-memory.dmp

    Filesize

    320KB

  • memory/2696-36-0x00007FFCCF310000-0x00007FFCCF505000-memory.dmp

    Filesize

    2.0MB

  • memory/2696-21-0x0000027578050000-0x0000027578051000-memory.dmp

    Filesize

    4KB

  • memory/2696-20-0x0000027578040000-0x0000027578041000-memory.dmp

    Filesize

    4KB

  • memory/2696-31-0x00000275779D0000-0x0000027577CF6000-memory.dmp

    Filesize

    3.1MB

  • memory/2696-32-0x00007FFCCF310000-0x00007FFCCF505000-memory.dmp

    Filesize

    2.0MB

  • memory/2696-33-0x000002757A800000-0x000002757AB24000-memory.dmp

    Filesize

    3.1MB

  • memory/2696-26-0x00007FFCCF310000-0x00007FFCCF505000-memory.dmp

    Filesize

    2.0MB

  • memory/2696-35-0x000002757AD20000-0x000002757ADD2000-memory.dmp

    Filesize

    712KB

  • memory/2696-25-0x00007FFCCF3AD000-0x00007FFCCF3AE000-memory.dmp

    Filesize

    4KB