Analysis

  • max time kernel
    79s
  • max time network
    80s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 11:27

General

  • Target

    mainn.exe

  • Size

    3.3MB

  • MD5

    88daabfadfec7379a7b25ff1602dd7bd

  • SHA1

    65c3f35d7150df340ca797a2662437933178c9b5

  • SHA256

    0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79

  • SHA512

    7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2

  • SSDEEP

    49152:7vBt62XlaSFNWPjljiFa2RoUYI1bxNESEgk/iSLoGdDTHHB72eh2NT:7vr62XlaSFNWPjljiFXRoUYIJxbc

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.12.185:4782

Mutex

15144cdb-7c06-478d-9be3-8228cfe2eee6

Attributes
  • encryption_key

    5FCAB94261E1E836E0ECC532E93B636646535E65

  • install_name

    Conhost.exe

  • log_directory

    Scex

  • reconnect_delay

    3000

  • startup_key

    Google Chrome

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 63 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 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\mainn.exe
    "C:\Users\Admin\AppData\Local\Temp\mainn.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4040
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1056
    • C:\Windows\system32\SubDir\Conhost.exe
      "C:\Windows\system32\SubDir\Conhost.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3216
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1004
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /7
    1⤵
    • Checks SCSI registry key(s)
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:4840
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:2420

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Windows\System32\SubDir\Conhost.exe

      Filesize

      3.3MB

      MD5

      88daabfadfec7379a7b25ff1602dd7bd

      SHA1

      65c3f35d7150df340ca797a2662437933178c9b5

      SHA256

      0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79

      SHA512

      7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2

    • memory/3216-29-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

      Filesize

      10.8MB

    • memory/3216-10-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

      Filesize

      10.8MB

    • memory/3216-11-0x000000001B9A0000-0x000000001B9B0000-memory.dmp

      Filesize

      64KB

    • memory/3216-12-0x000000001C140000-0x000000001C190000-memory.dmp

      Filesize

      320KB

    • memory/3216-13-0x000000001C250000-0x000000001C302000-memory.dmp

      Filesize

      712KB

    • memory/3216-14-0x000000001C940000-0x000000001CE68000-memory.dmp

      Filesize

      5.2MB

    • memory/3216-30-0x000000001B9A0000-0x000000001B9B0000-memory.dmp

      Filesize

      64KB

    • memory/4040-1-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

      Filesize

      10.8MB

    • memory/4040-2-0x00000000014F0000-0x0000000001500000-memory.dmp

      Filesize

      64KB

    • memory/4040-9-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

      Filesize

      10.8MB

    • memory/4040-0-0x00000000009F0000-0x0000000000D38000-memory.dmp

      Filesize

      3.3MB

    • memory/4840-16-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-22-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-23-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-25-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-24-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-27-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-26-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-28-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-18-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB

    • memory/4840-17-0x000001D2D0990000-0x000001D2D0991000-memory.dmp

      Filesize

      4KB