Analysis

  • max time kernel
    93s
  • max time network
    135s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/06/2024, 23:09

General

  • Target

    Client-built.exe

  • Size

    405KB

  • MD5

    0c84b58a5322284269f3b86e648e1fc8

  • SHA1

    6776c3963a64a3ace4caaff164669364356f72aa

  • SHA256

    47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357

  • SHA512

    02bc07552096f2b052e064ed2941cde5b70058066b614fa7374dbf7aa2177458a22d9746181b8f88e3468b252adf7e1aa1518ed9085ed78af5b736a02fa297d7

  • SSDEEP

    6144:yphjZx5jbx+DgrQo2fVH/i96bpjWprW5hthvo5lDzWEi5HFkgDVc:kjrZbaVfi6SGfel/WnHxDVc

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

School

C2

runderscore00-37568.portmap.host:37568

Mutex

QSR_MUTEX_BNyj3AdZ8NIXACv5S5

Attributes
  • encryption_key

    G3FFg7Ec2ieFqaQw5SZ2

  • 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
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Creates scheduled task(s) 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

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:3508
    • C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:368
    • 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:4480
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3428

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    405KB

    MD5

    0c84b58a5322284269f3b86e648e1fc8

    SHA1

    6776c3963a64a3ace4caaff164669364356f72aa

    SHA256

    47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357

    SHA512

    02bc07552096f2b052e064ed2941cde5b70058066b614fa7374dbf7aa2177458a22d9746181b8f88e3468b252adf7e1aa1518ed9085ed78af5b736a02fa297d7

  • memory/3508-6-0x0000000005CB0000-0x0000000005CC2000-memory.dmp

    Filesize

    72KB

  • memory/3508-1-0x0000000000670000-0x00000000006DC000-memory.dmp

    Filesize

    432KB

  • memory/3508-3-0x0000000005010000-0x00000000050A2000-memory.dmp

    Filesize

    584KB

  • memory/3508-4-0x0000000074790000-0x0000000074F40000-memory.dmp

    Filesize

    7.7MB

  • memory/3508-5-0x00000000050B0000-0x0000000005116000-memory.dmp

    Filesize

    408KB

  • memory/3508-0-0x000000007479E000-0x000000007479F000-memory.dmp

    Filesize

    4KB

  • memory/3508-7-0x00000000061F0000-0x000000000622C000-memory.dmp

    Filesize

    240KB

  • memory/3508-2-0x00000000055C0000-0x0000000005B64000-memory.dmp

    Filesize

    5.6MB

  • memory/3508-14-0x0000000074790000-0x0000000074F40000-memory.dmp

    Filesize

    7.7MB

  • memory/4480-15-0x0000000074790000-0x0000000074F40000-memory.dmp

    Filesize

    7.7MB

  • memory/4480-16-0x0000000074790000-0x0000000074F40000-memory.dmp

    Filesize

    7.7MB

  • memory/4480-18-0x00000000062C0000-0x00000000062CA000-memory.dmp

    Filesize

    40KB

  • memory/4480-19-0x0000000074790000-0x0000000074F40000-memory.dmp

    Filesize

    7.7MB

  • memory/4480-20-0x0000000074790000-0x0000000074F40000-memory.dmp

    Filesize

    7.7MB