Overview

overview

10

Static

static

10

Client-built.exe

windows10-2004-x64

10

Client-built.exe

windows10-ltsc_2021-x64

10

Client-built.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260130-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260130-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    01/02/2026, 07:33

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General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample260201-jd2clsdw8c
  • SHA256 f7f23812d44892e2b997e1223ddc58b8d1578f94af1b4dc0d1368db3895844cf
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
office04executionquasarpersistencespywaretrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • Office04

C2

  • kaidealdoland-44457.portmap.host:5050

Mutex

  • e0a3ec5c-a0f5-4259-b0b7-dcf794e85245

Attributes
  • encryption_key

    863F4DF4141747CA26FD5DF890DF3D94B66CB962

  • install_name

    svchost.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    svchost

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar family
    quasar
  • Quasar payload 2 IoCs
  • Executes dropped EXE 2 IoCs
  • 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 WriteProcessMemory 3 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:2468
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "svchost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:532
    • C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2744
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "svchost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3568
  • C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe
    C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4408

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        svchost.exe
        • Path C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe
        • Size 3.1MB
        • SHA256 f7f23812d44892e2b997e1223ddc58b8d1578f94af1b4dc0d1368db3895844cf
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/2468-0-0x0000000000B50000-0x0000000000E74000-memory.dmp
        Download

        memory/2468-1-0x000000001BB50000-0x000000001BB60000-memory.dmp
        Download

        memory/2744-6-0x000000001AD70000-0x000000001ADC0000-memory.dmp
        Download

        memory/2744-7-0x000000001D2C0000-0x000000001D372000-memory.dmp
        Download