Analysis

  • max time kernel
    91s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/01/2023, 04:33

General

  • Target

    ss.ps1

  • Size

    5.1MB

  • MD5

    970aca768e68faa580f758a1a379686b

  • SHA1

    6a93921485cbd83382eb5a47315b1f0a67bcf684

  • SHA256

    6c1e62385d660ca43e024d461154fbb4805e429cdf7850d19510d7f69533739e

  • SHA512

    66dd4c5b17978e68c8e0cd2bc4fd35ba5d519447ff34259ec77d11e4253cbfc9955a43915ed3c343f41dc04d97f4302ab6922a823b0e0da44e8893d29ec7cf0f

  • SSDEEP

    49152:CY1wOeTfeinwRg0Yd0YtWdR2++BqkPiblNmBZOqsHtL3rdyW6JKHINYMpnkq/3+s:E

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

ghcc.duckdns.org:4782

Mutex

a9c03eb7-f3c1-4b9e-a4f7-1962d17a793b

Attributes
  • encryption_key

    B0326395AC2D48856CAE22978A087DF5DCF5816D

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Update

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 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 behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\ss.ps1
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4032
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3532
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:220

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/3532-142-0x0000000006080000-0x0000000006698000-memory.dmp

    Filesize

    6.1MB

  • memory/3532-137-0x0000000000520000-0x00000000005A4000-memory.dmp

    Filesize

    528KB

  • memory/3532-138-0x0000000004FB0000-0x0000000005554000-memory.dmp

    Filesize

    5.6MB

  • memory/3532-139-0x0000000004AA0000-0x0000000004B32000-memory.dmp

    Filesize

    584KB

  • memory/3532-140-0x0000000004A80000-0x0000000004A8A000-memory.dmp

    Filesize

    40KB

  • memory/3532-143-0x0000000005B30000-0x0000000005B80000-memory.dmp

    Filesize

    320KB

  • memory/3532-144-0x0000000005DA0000-0x0000000005E52000-memory.dmp

    Filesize

    712KB

  • memory/3532-145-0x0000000006F90000-0x0000000006FF6000-memory.dmp

    Filesize

    408KB

  • memory/4032-136-0x00007FF834C30000-0x00007FF8356F1000-memory.dmp

    Filesize

    10.8MB

  • memory/4032-133-0x00007FF834C30000-0x00007FF8356F1000-memory.dmp

    Filesize

    10.8MB

  • memory/4032-132-0x0000029F425D0000-0x0000029F425F2000-memory.dmp

    Filesize

    136KB