Analysis

  • max time kernel
    107s
  • max time network
    141s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/01/2023, 15:07

General

  • Target

    l1yprr.ps1

  • Size

    5.1MB

  • MD5

    861b5567c79e55d2a3c704a9bbece9dc

  • SHA1

    8ba826c4760bc5e39b41bb0bfead46c4792a3607

  • SHA256

    6f890fdcdb5267b92b3b793ff8b17484bc1a6a4107a68f2b4282d386225b63f1

  • SHA512

    dd153c269f4b2505449dcc52219f419514dd9aeb312eae4b04140ac0e7662675286044874fb665e900b433c95728c476dc3ee03a919671bea3f8f6635b0a8400

  • SSDEEP

    49152:fY1wOeTfeinwRg0Yd0YtWdR2++BqkPiblNmBZOqsHtL3rdyW6JKHINYMpnkq/3+/:y

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\l1yprr.ps1
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1980
    • 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:2668
      • 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:404

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/1980-132-0x00000276B52F0000-0x00000276B5312000-memory.dmp

    Filesize

    136KB

  • memory/1980-133-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

    Filesize

    10.8MB

  • memory/1980-136-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

    Filesize

    10.8MB

  • memory/2668-139-0x0000000004A40000-0x0000000004AD2000-memory.dmp

    Filesize

    584KB

  • memory/2668-138-0x0000000004F20000-0x00000000054C4000-memory.dmp

    Filesize

    5.6MB

  • memory/2668-137-0x0000000000500000-0x0000000000584000-memory.dmp

    Filesize

    528KB

  • memory/2668-140-0x0000000004CD0000-0x0000000004CDA000-memory.dmp

    Filesize

    40KB

  • memory/2668-142-0x0000000006130000-0x0000000006748000-memory.dmp

    Filesize

    6.1MB

  • memory/2668-143-0x0000000005BF0000-0x0000000005C40000-memory.dmp

    Filesize

    320KB

  • memory/2668-144-0x0000000005E60000-0x0000000005F12000-memory.dmp

    Filesize

    712KB

  • memory/2668-145-0x0000000006F00000-0x0000000006F66000-memory.dmp

    Filesize

    408KB