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Analysis

  • max time kernel
    102s
  • max time network
    118s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/12/2024, 10:57

General

  • Target

    3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe

  • Size

    3.1MB

  • MD5

    ab02937fb8fc8ccce7853d22fe9ff280

  • SHA1

    cf180eba95b42bcf3ff80ed3e2922d7805ec1f72

  • SHA256

    3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515b

  • SHA512

    7fd897a2f658181fd68cc036069c20f7a25afb92d07684005085b68d1f7e96dcb84688f0b8132ca0c200c2d0ac698e6a52014a0b8c8ea2bfe4b314c4756ee1b5

  • SSDEEP

    49152:Vvht62XlaSFNWPjljiFa2RoUYIdqWhybRjPLoGddJfTHHB72eh2NT:VvL62XlaSFNWPjljiFXRoUYIdqWhWT

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.17:5555

Mutex

3b1732e2-6a81-44bb-8d99-4472451b1cf3

Attributes
  • encryption_key

    871AD53C1EE1C8F197D53D3E1DCA45CC62B82B8D

  • install_name

    javaconfig.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    JavaUpdater

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • 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\3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe
    "C:\Users\Admin\AppData\Local\Temp\3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:548
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "JavaUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4676
    • C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.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:932
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "JavaUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3452

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    ab02937fb8fc8ccce7853d22fe9ff280

    SHA1

    cf180eba95b42bcf3ff80ed3e2922d7805ec1f72

    SHA256

    3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515b

    SHA512

    7fd897a2f658181fd68cc036069c20f7a25afb92d07684005085b68d1f7e96dcb84688f0b8132ca0c200c2d0ac698e6a52014a0b8c8ea2bfe4b314c4756ee1b5

  • memory/548-0-0x00007FF9F5A73000-0x00007FF9F5A75000-memory.dmp

    Filesize

    8KB

  • memory/548-1-0x00000000007A0000-0x0000000000AC6000-memory.dmp

    Filesize

    3.1MB

  • memory/548-2-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

    Filesize

    10.8MB

  • memory/548-9-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

    Filesize

    10.8MB

  • memory/932-10-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

    Filesize

    10.8MB

  • memory/932-11-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

    Filesize

    10.8MB

  • memory/932-12-0x000000001B2A0000-0x000000001B2F0000-memory.dmp

    Filesize

    320KB

  • memory/932-13-0x000000001BC20000-0x000000001BCD2000-memory.dmp

    Filesize

    712KB

  • memory/932-14-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

    Filesize

    10.8MB