Overview

overview

10

Static

static

10

Client-built.exe

windows10-ltsc 2021-x64

10

Analysis

  • max time kernel
    134s
  • max time network
    150s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241023-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    31/10/2024, 00:30

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    dca77ba52c9e20bdb3fcb81657918f89

  • SHA1

    7cec39d83783008bb9a151b2a71dbc1eb03a7bbf

  • SHA256

    fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

  • SHA512

    30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a

  • SSDEEP

    49152:uv3I22SsaNYfdPBldt698dBcjHOezFXear1QoGdiWTHHB72eh2NT:uv422SsaNYfdPBldt6+dBcjHXZXK

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.127.1.2:1604

Mutex

93b40a09-fbd7-4b29-8423-560b40061e4f

Attributes
  • encryption_key

    55EAC2BE7559DA6721E45ED8C2349D6EFC3C9EE2

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar family
    quasar
  • Quasar payload 2 IoCs
  • Executes dropped EXE 9 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 33 IoCs
  • Suspicious use of AdjustPrivilegeToken 15 IoCs
  • Suspicious use of FindShellTrayWindow 61 IoCs
  • Suspicious use of SendNotifyMessage 60 IoCs
  • Suspicious use of WriteProcessMemory 12 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:4800
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4132
    • 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 FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:4196
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:892
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /0
    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:4996
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:1008
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1256
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        2⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1504
      • 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 FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:3768
        • C:\Windows\SYSTEM32\schtasks.exe
          "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
          3⤵
          • Scheduled Task/Job: Scheduled Task
          PID:3172
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3576
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:944
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1016
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1772
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4980
    • C:\Users\Admin\Desktop\Client.exe
      "C:\Users\Admin\Desktop\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4460

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      1KB

      MD5

      b08c36ce99a5ed11891ef6fc6d8647e9

      SHA1

      db95af417857221948eb1882e60f98ab2914bf1d

      SHA256

      cc9248a177495f45ec70b86c34fc5746c56730af36ace98ac7eb365dbafda674

      SHA512

      07e62581eace395b0a9699d727761648103180c21155d84ea09140f9e1c9690705c419118545aa67a564334bbde32710225fe3aa92b0b4b4210cb91f0058b1ea

      Download Submit

    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      Filesize

      3.1MB

      MD5

      dca77ba52c9e20bdb3fcb81657918f89

      SHA1

      7cec39d83783008bb9a151b2a71dbc1eb03a7bbf

      SHA256

      fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

      SHA512

      30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a

      Download Submit

    • memory/4196-24-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4196-5-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4196-7-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4196-8-0x000000001C720000-0x000000001C770000-memory.dmp

      Filesize

      320KB

      Download

    • memory/4196-9-0x000000001C830000-0x000000001C8E2000-memory.dmp

      Filesize

      712KB

      Download

    • memory/4196-10-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4800-1-0x0000000000860000-0x0000000000B84000-memory.dmp

      Filesize

      3.1MB

      Download

    • memory/4800-2-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4800-6-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4800-0-0x00007FFF26413000-0x00007FFF26415000-memory.dmp

      Filesize

      8KB

      Download

    • memory/4996-12-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-21-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-23-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-22-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-20-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-19-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-18-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-17-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-11-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4996-13-0x0000012F4C720000-0x0000012F4C721000-memory.dmp

      Filesize

      4KB

      Download