Analysis

  • max time kernel
    94s
  • max time network
    141s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-12-2024 10:00

General

  • Target

    Loader.exe

  • Size

    3.1MB

  • MD5

    e9a138d8c5ab2cccc8bf9976f66d30c8

  • SHA1

    e996894168f0d4e852162d1290250dfa986310f8

  • SHA256

    e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

  • SHA512

    5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc

  • SSDEEP

    49152:fvrI22SsaNYfdPBldt698dBcjHCWvXE/sGkCqILo+dPVTHHB72eh2NT:fvU22SsaNYfdPBldt6+dBcjHCWvTm

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Dystopian-62863.portmap.host:62863

Mutex

e1de8f9b-5a7a-4798-a6fb-c03591ef3442

Attributes
  • encryption_key

    8C1BB32BFD240218BA0CB04D65341FB1FDE1E001

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    SubStart

  • 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 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\Loader.exe
    "C:\Users\Admin\AppData\Local\Temp\Loader.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2920
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4884
    • 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:3012
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:440

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

    e9a138d8c5ab2cccc8bf9976f66d30c8

    SHA1

    e996894168f0d4e852162d1290250dfa986310f8

    SHA256

    e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

    SHA512

    5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc

  • memory/2920-10-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB

  • memory/2920-1-0x0000000000CB0000-0x0000000000FD4000-memory.dmp

    Filesize

    3.1MB

  • memory/2920-2-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB

  • memory/2920-0-0x00007FFB1AC13000-0x00007FFB1AC15000-memory.dmp

    Filesize

    8KB

  • memory/3012-11-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB

  • memory/3012-9-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB

  • memory/3012-12-0x000000001BDD0000-0x000000001BE20000-memory.dmp

    Filesize

    320KB

  • memory/3012-13-0x000000001C690000-0x000000001C742000-memory.dmp

    Filesize

    712KB

  • memory/3012-16-0x000000001BE40000-0x000000001BE52000-memory.dmp

    Filesize

    72KB

  • memory/3012-17-0x000000001C5D0000-0x000000001C60C000-memory.dmp

    Filesize

    240KB

  • memory/3012-18-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB

  • memory/3012-19-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB

  • memory/3012-21-0x00007FFB1AC10000-0x00007FFB1B6D1000-memory.dmp

    Filesize

    10.8MB