Resubmissions

15-12-2024 23:39

241215-3ndh3svkbl 10

15-12-2024 22:49

241215-2rpj3sspaq 10

Analysis

  • max time kernel
    129s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-12-2024 22:49

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    85b177add44a49f07c6610191c064bbc

  • SHA1

    7766290221b9dafd7c0d6d983070f55863ed1b26

  • SHA256

    7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb

  • SHA512

    0a4d7e6a5c3e2d63a92f2ae57ab68561f47e827edffea6ea83aebac8286aab886c3bd98c6e791222411d272a925e8b3e03e14dc1b1017aaa449c1b0674717798

  • SSDEEP

    49152:TvChBYjCO4Dt2d5aKCuVPzlEmVQL0wvwkaUEGiBeHLoVd2THHB72eh2NT:Tv8t2d5aKCuVPzlEmVQ0wvwf/Gp

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ratted

C2

localhost:4782

87.97.126.177:4782

Mutex

48887e39-00c3-4c7d-9fbd-aa9bee5b1a88

Attributes
  • encryption_key

    CD36E224C70A801E8033FBB0E5129B1EA712AE1D

  • install_name

    Windows Font Manager.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Font Manager

  • subdirectory

    Fonts

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 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 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3464
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Font Manager" /sc ONLOGON /tr "C:\Windows\system32\Fonts\Windows Font Manager.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4024
    • C:\Windows\system32\Fonts\Windows Font Manager.exe
      "C:\Windows\system32\Fonts\Windows Font Manager.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3676
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windows Font Manager" /sc ONLOGON /tr "C:\Windows\system32\Fonts\Windows Font Manager.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3280

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\Fonts\Windows Font Manager.exe

    Filesize

    3.1MB

    MD5

    85b177add44a49f07c6610191c064bbc

    SHA1

    7766290221b9dafd7c0d6d983070f55863ed1b26

    SHA256

    7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb

    SHA512

    0a4d7e6a5c3e2d63a92f2ae57ab68561f47e827edffea6ea83aebac8286aab886c3bd98c6e791222411d272a925e8b3e03e14dc1b1017aaa449c1b0674717798

  • memory/3464-0-0x00007FF8A8573000-0x00007FF8A8575000-memory.dmp

    Filesize

    8KB

  • memory/3464-1-0x0000000000850000-0x0000000000B74000-memory.dmp

    Filesize

    3.1MB

  • memory/3464-2-0x00007FF8A8570000-0x00007FF8A9031000-memory.dmp

    Filesize

    10.8MB

  • memory/3464-10-0x00007FF8A8570000-0x00007FF8A9031000-memory.dmp

    Filesize

    10.8MB

  • memory/3676-9-0x00007FF8A8570000-0x00007FF8A9031000-memory.dmp

    Filesize

    10.8MB

  • memory/3676-11-0x00007FF8A8570000-0x00007FF8A9031000-memory.dmp

    Filesize

    10.8MB

  • memory/3676-12-0x000000001B9E0000-0x000000001BA30000-memory.dmp

    Filesize

    320KB

  • memory/3676-13-0x000000001BF30000-0x000000001BFE2000-memory.dmp

    Filesize

    712KB

  • memory/3676-14-0x00007FF8A8570000-0x00007FF8A9031000-memory.dmp

    Filesize

    10.8MB