Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-04-2024 17:39

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    2aebe66b019df4695fe7218875c93856

  • SHA1

    646890986ef0bba4eed6b659d56704d09e414562

  • SHA256

    ea3003e00c6e653fad8844d4677ceef7b7b6e499939ed765a49df3898ddf3c45

  • SHA512

    7391db69d5cc021dee50b2af12d11b30a4225f46b4469d10eff4e659c71c298233dea01e1e626d35d49b9490ef3dcaa1570b4448859d9d04ac0270b71c84bddc

  • SSDEEP

    49152:WvbI22SsaNYfdPBldt698dBcjHHyxNESEXk/ijLoGdAwXTHHB72eh2NT:Wvk22SsaNYfdPBldt6+dBcjHSxavD

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

x.tcp.ngrok.io:16096

Mutex

755f883f-4d58-4349-bc9e-f21c4e163b6f

Attributes
  • encryption_key

    EE65D8F2E429F4900E3A17963595716D863A2455

  • 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.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 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.

  • 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3572
    • 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⤵
      • Creates scheduled task(s)
      PID:2076
    • 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 SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2912
      • 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⤵
        • Creates scheduled task(s)
        PID:3956

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

    2aebe66b019df4695fe7218875c93856

    SHA1

    646890986ef0bba4eed6b659d56704d09e414562

    SHA256

    ea3003e00c6e653fad8844d4677ceef7b7b6e499939ed765a49df3898ddf3c45

    SHA512

    7391db69d5cc021dee50b2af12d11b30a4225f46b4469d10eff4e659c71c298233dea01e1e626d35d49b9490ef3dcaa1570b4448859d9d04ac0270b71c84bddc

  • memory/2912-10-0x000000001B790000-0x000000001B7A0000-memory.dmp

    Filesize

    64KB

  • memory/2912-9-0x00007FFF0ADE0000-0x00007FFF0B8A1000-memory.dmp

    Filesize

    10.8MB

  • memory/2912-11-0x000000001C610000-0x000000001C660000-memory.dmp

    Filesize

    320KB

  • memory/2912-12-0x000000001C720000-0x000000001C7D2000-memory.dmp

    Filesize

    712KB

  • memory/2912-13-0x00007FFF0ADE0000-0x00007FFF0B8A1000-memory.dmp

    Filesize

    10.8MB

  • memory/2912-14-0x000000001B790000-0x000000001B7A0000-memory.dmp

    Filesize

    64KB

  • memory/3572-0-0x0000000000B40000-0x0000000000E64000-memory.dmp

    Filesize

    3.1MB

  • memory/3572-1-0x00007FFF0ADE0000-0x00007FFF0B8A1000-memory.dmp

    Filesize

    10.8MB

  • memory/3572-2-0x000000001BC70000-0x000000001BC80000-memory.dmp

    Filesize

    64KB

  • memory/3572-8-0x00007FFF0ADE0000-0x00007FFF0B8A1000-memory.dmp

    Filesize

    10.8MB