Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 15:24

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    eb8790c82d5096b84022449c2298c62a

  • SHA1

    12030a6f4988fb744328bc1963c7017207e40276

  • SHA256

    5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82

  • SHA512

    d4d7ac397e023e6c08dfd6681e802d4c52d56a45a4e66acd53bc0138d3ed45f3930ef0d90cdeaafcf478d08ecab28cae61ffe5c571fa4c37be39497f16891464

  • SSDEEP

    49152:WvIt62XlaSFNWPjljiFa2RoUYIruW+dpfYoGdizZDTHHB72eh2NT:WvE62XlaSFNWPjljiFXRoUYI6W9

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.240:4782

Mutex

fcdb4cfb-dc40-4f51-b2c7-f723b5404e35

Attributes
  • encryption_key

    1074AFFC8845D6B93DCAD37B9C170AE9CD58D08A

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windowsstartup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4984
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2588
    • 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:3684
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:5088

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

    eb8790c82d5096b84022449c2298c62a

    SHA1

    12030a6f4988fb744328bc1963c7017207e40276

    SHA256

    5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82

    SHA512

    d4d7ac397e023e6c08dfd6681e802d4c52d56a45a4e66acd53bc0138d3ed45f3930ef0d90cdeaafcf478d08ecab28cae61ffe5c571fa4c37be39497f16891464

  • memory/3684-9-0x00007FF89B2C0000-0x00007FF89BD81000-memory.dmp

    Filesize

    10.8MB

  • memory/3684-10-0x00000000030B0000-0x00000000030C0000-memory.dmp

    Filesize

    64KB

  • memory/3684-11-0x000000001BCB0000-0x000000001BD00000-memory.dmp

    Filesize

    320KB

  • memory/3684-12-0x000000001C4C0000-0x000000001C572000-memory.dmp

    Filesize

    712KB

  • memory/3684-13-0x00007FF89B2C0000-0x00007FF89BD81000-memory.dmp

    Filesize

    10.8MB

  • memory/3684-14-0x00000000030B0000-0x00000000030C0000-memory.dmp

    Filesize

    64KB

  • memory/4984-0-0x00000000001E0000-0x0000000000504000-memory.dmp

    Filesize

    3.1MB

  • memory/4984-1-0x00007FF89B2C0000-0x00007FF89BD81000-memory.dmp

    Filesize

    10.8MB

  • memory/4984-2-0x000000001B150000-0x000000001B160000-memory.dmp

    Filesize

    64KB

  • memory/4984-8-0x00007FF89B2C0000-0x00007FF89BD81000-memory.dmp

    Filesize

    10.8MB