Analysis

  • max time kernel
    93s
  • max time network
    138s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14-04-2024 13:50

General

  • Target

    Client.exe

  • Size

    3.1MB

  • MD5

    1109da1db2b4175b38ae1bc7c881db9a

  • SHA1

    02b92b5e6aa54ae040bc5cd5e845287be01c9562

  • SHA256

    0aadcb147077d657fd68e222689a25d93c40144d54922c83b4171a5e801235c5

  • SHA512

    44cc1ee0e92159f4d41b4b1c9ae52a7b208b7888c5864795f1e815725d26677e2c7f4fce6410a8cfa8e07c8ee19c3f07f4110c64f1eca62d2f6bbf4cdda8f952

  • SSDEEP

    49152:rvbI22SsaNYfdPBldt698dBcjHRTaxzBxL9aGdg6STHHB72eh2NT:rvk22SsaNYfdPBldt6+dBcjHRTaxh

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

140.238.91.110:34309

Mutex

d748a36c-8402-4813-815d-0daea2ec5f51

Attributes
  • encryption_key

    312796590553474EC6AA07D7A09E6A1B8FA1043A

  • install_name

    dllhostx64.exe

  • log_directory

    Error Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Boot Menu

  • subdirectory

    Windows

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 14 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.exe
    "C:\Users\Admin\AppData\Local\Temp\Client.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2316
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Boot Menu" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\dllhostx64.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4852
    • C:\Users\Admin\AppData\Roaming\Windows\dllhostx64.exe
      "C:\Users\Admin\AppData\Roaming\Windows\dllhostx64.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4536
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windows Boot Menu" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\dllhostx64.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:436
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /delete /tn "Windows Boot Menu" /f
        3⤵
          PID:4272
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\zQetchivhJ7H.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:5004
          • C:\Windows\system32\chcp.com
            chcp 65001
            4⤵
              PID:3264
            • C:\Windows\system32\PING.EXE
              ping -n 10 localhost
              4⤵
              • Runs ping.exe
              PID:1112

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\zQetchivhJ7H.bat

        Filesize

        216B

        MD5

        8d802fa906b51673297f3731a5c3c156

        SHA1

        5697abe42f0f5c4993a2bba594e2ab28212478b3

        SHA256

        7e2a870bd957452a5b0112ac55753baaacfde3891a6efe3ea905809152b13522

        SHA512

        2572994767e5dc4061b15d2f67f47cf154e76324df657572ee4b6cff43eb274672012dd0ee0d3337271774e39f87f726a3905a2880019e959cd571e5af384d7b

      • C:\Users\Admin\AppData\Roaming\Windows\dllhostx64.exe

        Filesize

        3.1MB

        MD5

        1109da1db2b4175b38ae1bc7c881db9a

        SHA1

        02b92b5e6aa54ae040bc5cd5e845287be01c9562

        SHA256

        0aadcb147077d657fd68e222689a25d93c40144d54922c83b4171a5e801235c5

        SHA512

        44cc1ee0e92159f4d41b4b1c9ae52a7b208b7888c5864795f1e815725d26677e2c7f4fce6410a8cfa8e07c8ee19c3f07f4110c64f1eca62d2f6bbf4cdda8f952

      • memory/2316-0-0x0000000000E90000-0x00000000011B4000-memory.dmp

        Filesize

        3.1MB

      • memory/2316-1-0x00007FFA382A0000-0x00007FFA38D61000-memory.dmp

        Filesize

        10.8MB

      • memory/2316-2-0x000000001C030000-0x000000001C040000-memory.dmp

        Filesize

        64KB

      • memory/2316-8-0x00007FFA382A0000-0x00007FFA38D61000-memory.dmp

        Filesize

        10.8MB

      • memory/4536-10-0x000000001B4B0000-0x000000001B4C0000-memory.dmp

        Filesize

        64KB

      • memory/4536-11-0x000000001C110000-0x000000001C160000-memory.dmp

        Filesize

        320KB

      • memory/4536-12-0x000000001C220000-0x000000001C2D2000-memory.dmp

        Filesize

        712KB

      • memory/4536-13-0x000000001C180000-0x000000001C192000-memory.dmp

        Filesize

        72KB

      • memory/4536-14-0x000000001C1E0000-0x000000001C21C000-memory.dmp

        Filesize

        240KB

      • memory/4536-15-0x00007FFA382A0000-0x00007FFA38D61000-memory.dmp

        Filesize

        10.8MB

      • memory/4536-16-0x000000001B4B0000-0x000000001B4C0000-memory.dmp

        Filesize

        64KB

      • memory/4536-21-0x00007FFA382A0000-0x00007FFA38D61000-memory.dmp

        Filesize

        10.8MB

      • memory/4536-9-0x00007FFA382A0000-0x00007FFA38D61000-memory.dmp

        Filesize

        10.8MB