Analysis

  • max time kernel
    122s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    12-04-2024 01:57

General

  • Target

    d543c38fb2f5f8e687d97cff1878a2e4e4ada846c3fb3df5e43e6f189da29833.exe

  • Size

    3.1MB

  • MD5

    3396e77d0d043554c7f857a1249c75fe

  • SHA1

    d3de2678e85f4ad63e5254782a58a85035aafecc

  • SHA256

    d543c38fb2f5f8e687d97cff1878a2e4e4ada846c3fb3df5e43e6f189da29833

  • SHA512

    3128c03a0465d03127cf6df186533993e2337dce8ca821d8dbcaecd08c7ff7a6d2646de150b7afbe20641e4eb08104342813dfd2fe50346c8b47d40deedc67a4

  • SSDEEP

    49152:WvnG42pda6D+/PjlLOlg6yQipV7tjMpETOk/FLoGd7RTHHB72eh2NT:WvG42pda6D+/PjlLOlZyQipVhj9

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.10.8.36:4782

0.tcp.eu.ngrok.io:19992

tcp://5.tcp.eu.ngrok.io:10477

Mutex

570f8f63-dc8c-471b-b7f5-710ac819d722

Attributes
  • encryption_key

    BB0B2DE4F1126E98797D1ABADF2CCEC47E72B5FD

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    150

  • startup_key

    Platonus

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Detects Windows executables referencing non-Windows User-Agents 1 IoCs
  • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 1 IoCs
  • Detects executables containing common artifacts observed in infostealers 1 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 3 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\d543c38fb2f5f8e687d97cff1878a2e4e4ada846c3fb3df5e43e6f189da29833.exe
    "C:\Users\Admin\AppData\Local\Temp\d543c38fb2f5f8e687d97cff1878a2e4e4ada846c3fb3df5e43e6f189da29833.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1936
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Platonus" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2520

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • memory/1936-0-0x00000000001A0000-0x00000000004C4000-memory.dmp

    Filesize

    3.1MB

  • memory/1936-1-0x000007FEF5DF0000-0x000007FEF67DC000-memory.dmp

    Filesize

    9.9MB

  • memory/1936-2-0x0000000002430000-0x00000000024B0000-memory.dmp

    Filesize

    512KB

  • memory/1936-4-0x000007FEF5DF0000-0x000007FEF67DC000-memory.dmp

    Filesize

    9.9MB

  • memory/1936-5-0x0000000002430000-0x00000000024B0000-memory.dmp

    Filesize

    512KB