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Overview

overview

10

Static

static

10

Client-built.exe

windows7-x64

10

Client-built.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    141s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/01/2025, 22:11

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    5722eb2897c6a41e56fcc3173d9adf78

  • SHA1

    a1fa064390fbe44cf7fb1eef8a4e68f26d4a5ef3

  • SHA256

    6e32a831742951b814f3826c7377094db7ea20f81508043b946e3e4df6c5b162

  • SHA512

    5ca756e5079b2a7498c6dba25da3717a467437fee713642dabafa8417040728b0531450a877a736ba3a248c7a6b33e317b7e795e437a5cc81cb6ad9e3a0227a7

  • SSDEEP

    49152:Kv3I22SsaNYfdPBldt698dBcjHDxM/doGdq1THHB72eh2NT:Kv422SsaNYfdPBldt6+dBcjHDxMVa

Score
10/10
quasarfirstspywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

first

C2

ZyloX-37288.portmap.host:37288

Mutex

44382739-6e8e-4a03-b838-6ed9f8f4bf36

Attributes
  • encryption_key

    59DD70006F5E5424ACBA442199524AA9815F439E

  • install_name

    Calculator.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    RtkAudUService86

  • subdirectory

    Calculator_UWP

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar family
    quasar
  • 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.

    persistenceexecution
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3128
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4236
    • C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe
      "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:2880
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:5064
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4568
    • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
      "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4384

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client-built.exe.log
      Filesize

      1KB

      MD5

      baf55b95da4a601229647f25dad12878

      SHA1

      abc16954ebfd213733c4493fc1910164d825cac8

      SHA256

      ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

      SHA512

      24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

      Download Submit

    • C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe
      Filesize

      3.1MB

      MD5

      5722eb2897c6a41e56fcc3173d9adf78

      SHA1

      a1fa064390fbe44cf7fb1eef8a4e68f26d4a5ef3

      SHA256

      6e32a831742951b814f3826c7377094db7ea20f81508043b946e3e4df6c5b162

      SHA512

      5ca756e5079b2a7498c6dba25da3717a467437fee713642dabafa8417040728b0531450a877a736ba3a248c7a6b33e317b7e795e437a5cc81cb6ad9e3a0227a7

      Download Submit

    • memory/2880-8-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/2880-10-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/2880-11-0x000000001D350000-0x000000001D3A0000-memory.dmp

      Filesize

      320KB

      Download

    • memory/2880-12-0x000000001D460000-0x000000001D512000-memory.dmp

      Filesize

      712KB

      Download

    • memory/2880-13-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/3128-0-0x00007FF96A283000-0x00007FF96A285000-memory.dmp

      Filesize

      8KB

      Download

    • memory/3128-1-0x0000000000BF0000-0x0000000000F14000-memory.dmp

      Filesize

      3.1MB

      Download

    • memory/3128-2-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/3128-9-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

      Filesize

      10.8MB

      Download