Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    05-08-2024 16:18

General

  • Target

    Bootstrapper.exe

  • Size

    3.1MB

  • MD5

    14b871855a9046ef9aedeec80f9c2d86

  • SHA1

    32c0ad34f524748b76c090fc881b75b928341e7e

  • SHA256

    b14b916cd2f188ea09035489056e0bff9f8cb8e4a30eff50172f86319fabc940

  • SHA512

    7ada8280b9a5a4dcb427da5f7634335c191645614148ed550dbbbacfaed72e1e99202caedddc02f48dc73d96bf0ecd4d35c2ed2d6206e9b25efba4f29dcc8e96

  • SSDEEP

    49152:3v7lL26AaNeWgPhlmVqvMQ7XSKlfyCC4KgoGdulF8THHB72eh2NT:3vhL26AaNeWgPhlmVqkQ7XSKlfyg

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

wefdwef-34180.portmap.host:34180

Mutex

c4be1726-3f86-4f80-bc7c-0779b06ffeeb

Attributes
  • encryption_key

    97BF1FDCF446A7218FA05296FD8D8F0C41A6B1E7

  • install_name

    Bootstrapper.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Spotify

  • subdirectory

    system32

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 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\Bootstrapper.exe
    "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2812
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Spotify" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2212
    • C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe
      "C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2392
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Spotify" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1704

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Bootstrapper.exe.log

    Filesize

    1KB

    MD5

    b4e91d2e5f40d5e2586a86cf3bb4df24

    SHA1

    31920b3a41aa4400d4a0230a7622848789b38672

    SHA256

    5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210

    SHA512

    968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319

  • C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe

    Filesize

    3.1MB

    MD5

    14b871855a9046ef9aedeec80f9c2d86

    SHA1

    32c0ad34f524748b76c090fc881b75b928341e7e

    SHA256

    b14b916cd2f188ea09035489056e0bff9f8cb8e4a30eff50172f86319fabc940

    SHA512

    7ada8280b9a5a4dcb427da5f7634335c191645614148ed550dbbbacfaed72e1e99202caedddc02f48dc73d96bf0ecd4d35c2ed2d6206e9b25efba4f29dcc8e96

  • memory/2392-10-0x00007FFAB5AC0000-0x00007FFAB5E34000-memory.dmp

    Filesize

    3.5MB

  • memory/2392-11-0x00007FFAB5AC0000-0x00007FFAB5E34000-memory.dmp

    Filesize

    3.5MB

  • memory/2392-12-0x000000001BCF0000-0x000000001BD40000-memory.dmp

    Filesize

    320KB

  • memory/2392-13-0x000000001BE00000-0x000000001BEB2000-memory.dmp

    Filesize

    712KB

  • memory/2392-14-0x00007FFAB5AC0000-0x00007FFAB5E34000-memory.dmp

    Filesize

    3.5MB

  • memory/2812-0-0x00007FFAB5AC0000-0x00007FFAB5E34000-memory.dmp

    Filesize

    3.5MB

  • memory/2812-1-0x0000000000300000-0x0000000000624000-memory.dmp

    Filesize

    3.1MB

  • memory/2812-2-0x00007FFAB5AC0000-0x00007FFAB5E34000-memory.dmp

    Filesize

    3.5MB

  • memory/2812-9-0x00007FFAB5AC0000-0x00007FFAB5E34000-memory.dmp

    Filesize

    3.5MB