Analysis

  • max time kernel
    129s
  • max time network
    143s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 11:18

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    23aaf5e0d106b0f8ce7b98ebb248fa35

  • SHA1

    898101610b796f5d50de183a04ff029dbc6be064

  • SHA256

    bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658

  • SHA512

    d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40

  • SSDEEP

    49152:DvjI22SsaNYfdPBldt698dBcjH4bRJ6ubR3LoGdRPTHHB72eh2NT:Dvc22SsaNYfdPBldt6+dBcjH4bRJ6oB

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.115:4782

Mutex

cf2c53c5-bc92-40a0-b53b-7c5edbcd7ef3

Attributes
  • encryption_key

    EAFB08E07600E62659A174CCF3C54BA2CDDDD47A

  • 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 3 IoCs
  • Executes dropped EXE 1 IoCs
  • 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
  • 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:3012
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:3016
    • 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:2556
      • C:\Windows\system32\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:2632

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

    23aaf5e0d106b0f8ce7b98ebb248fa35

    SHA1

    898101610b796f5d50de183a04ff029dbc6be064

    SHA256

    bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658

    SHA512

    d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40

  • memory/2556-7-0x0000000000D70000-0x0000000001094000-memory.dmp

    Filesize

    3.1MB

  • memory/2556-8-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

    Filesize

    9.9MB

  • memory/2556-9-0x000000001B2F0000-0x000000001B370000-memory.dmp

    Filesize

    512KB

  • memory/2556-11-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

    Filesize

    9.9MB

  • memory/2556-12-0x000000001B2F0000-0x000000001B370000-memory.dmp

    Filesize

    512KB

  • memory/3012-0-0x0000000000C00000-0x0000000000F24000-memory.dmp

    Filesize

    3.1MB

  • memory/3012-1-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

    Filesize

    9.9MB

  • memory/3012-2-0x000000001B0D0000-0x000000001B150000-memory.dmp

    Filesize

    512KB

  • memory/3012-10-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

    Filesize

    9.9MB