Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-08-2024 00:42

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    94050f9434efcd579e1be0f1698dc4be

  • SHA1

    b1f9f9bb740805af70d91fd8dc16034fe6108b86

  • SHA256

    0fff45906cb1259652e8488ce8b7ce888a63c97332d9e3c7eb93b4c2aac1ea38

  • SHA512

    ed580833c456aafdd84871883f9bd2820e9c6a07e3402f69d5c632498491dba399c6e2464ef9379c944e7a4859ed634803d348d9ea24beb27d8dec47b64c09ad

  • SSDEEP

    49152:Pvkt62XlaSFNWPjljiFa2RoUYINdxNESEck/igLoGd065THHB72eh2NT:Pv462XlaSFNWPjljiFXRoUYI7x/+

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

127.0.0.1:80

Mutex

511efb52-a9ae-4985-832e-16d38c44402d

Attributes
  • encryption_key

    049DD0CDFAFA72509A542346F4510116A4D0866B

  • 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
  • Executes dropped EXE 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

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:4396
    • 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
      PID:1576

Network

MITRE ATT&CK Matrix

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    94050f9434efcd579e1be0f1698dc4be

    SHA1

    b1f9f9bb740805af70d91fd8dc16034fe6108b86

    SHA256

    0fff45906cb1259652e8488ce8b7ce888a63c97332d9e3c7eb93b4c2aac1ea38

    SHA512

    ed580833c456aafdd84871883f9bd2820e9c6a07e3402f69d5c632498491dba399c6e2464ef9379c944e7a4859ed634803d348d9ea24beb27d8dec47b64c09ad

  • memory/1576-8-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

    Filesize

    10.8MB

  • memory/1576-10-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

    Filesize

    10.8MB

  • memory/1576-11-0x0000000002A70000-0x0000000002AC0000-memory.dmp

    Filesize

    320KB

  • memory/1576-12-0x000000001B480000-0x000000001B532000-memory.dmp

    Filesize

    712KB

  • memory/1576-13-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

    Filesize

    10.8MB

  • memory/4396-0-0x00007FFA82CB3000-0x00007FFA82CB5000-memory.dmp

    Filesize

    8KB

  • memory/4396-1-0x0000000000440000-0x0000000000764000-memory.dmp

    Filesize

    3.1MB

  • memory/4396-2-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

    Filesize

    10.8MB

  • memory/4396-9-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

    Filesize

    10.8MB