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Analysis

  • max time kernel
    135s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31/03/2023, 01:14

General

  • Target

    3630b92ac5ed33de5eb53b563913bb02.exe

  • Size

    502KB

  • MD5

    3630b92ac5ed33de5eb53b563913bb02

  • SHA1

    34828f9a66c2c9c0f0cf93419dc96a62bfea476b

  • SHA256

    17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

  • SHA512

    034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

  • SSDEEP

    12288:dTEgdfYjbg+qBTaa4EywIGpYR1MIwcdD:+UwzgXywIGpYR6IwcdD

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office05

C2

needforrat.hopto.org:7771

Mutex

d70dba78-082d-4d62-9d71-b4a1c6961022

Attributes
  • encryption_key

    110272D9471BA005C613D451E07D98ABB8403AED

  • install_name

    Client1.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 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\3630b92ac5ed33de5eb53b563913bb02.exe
    "C:\Users\Admin\AppData\Local\Temp\3630b92ac5ed33de5eb53b563913bb02.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4384
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\3630b92ac5ed33de5eb53b563913bb02.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1352
    • C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:964
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1916

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe

    Filesize

    502KB

    MD5

    3630b92ac5ed33de5eb53b563913bb02

    SHA1

    34828f9a66c2c9c0f0cf93419dc96a62bfea476b

    SHA256

    17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

    SHA512

    034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

  • C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe

    Filesize

    502KB

    MD5

    3630b92ac5ed33de5eb53b563913bb02

    SHA1

    34828f9a66c2c9c0f0cf93419dc96a62bfea476b

    SHA256

    17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

    SHA512

    034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

  • memory/964-140-0x000000001C4B0000-0x000000001C4C0000-memory.dmp

    Filesize

    64KB

  • memory/964-141-0x000000001D090000-0x000000001D0E0000-memory.dmp

    Filesize

    320KB

  • memory/964-142-0x000000001D1A0000-0x000000001D252000-memory.dmp

    Filesize

    712KB

  • memory/4384-133-0x0000000000D60000-0x0000000000DE4000-memory.dmp

    Filesize

    528KB

  • memory/4384-134-0x000000001C870000-0x000000001C880000-memory.dmp

    Filesize

    64KB