Analysis

  • max time kernel
    142s
  • max time network
    164s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240412-en
  • resource tags

    arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    17-04-2024 11:27

General

  • Target

    mainn.exe

  • Size

    3.3MB

  • MD5

    88daabfadfec7379a7b25ff1602dd7bd

  • SHA1

    65c3f35d7150df340ca797a2662437933178c9b5

  • SHA256

    0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79

  • SHA512

    7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2

  • SSDEEP

    49152:7vBt62XlaSFNWPjljiFa2RoUYI1bxNESEgk/iSLoGdDTHHB72eh2NT:7vr62XlaSFNWPjljiFXRoUYIJxbc

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.12.185:4782

Mutex

15144cdb-7c06-478d-9be3-8228cfe2eee6

Attributes
  • encryption_key

    5FCAB94261E1E836E0ECC532E93B636646535E65

  • install_name

    Conhost.exe

  • log_directory

    Scex

  • reconnect_delay

    3000

  • startup_key

    Google Chrome

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • 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 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\mainn.exe
    "C:\Users\Admin\AppData\Local\Temp\mainn.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1248
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2684
    • C:\Windows\system32\SubDir\Conhost.exe
      "C:\Windows\system32\SubDir\Conhost.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:944
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3012

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\SubDir\Conhost.exe

    Filesize

    3.3MB

    MD5

    88daabfadfec7379a7b25ff1602dd7bd

    SHA1

    65c3f35d7150df340ca797a2662437933178c9b5

    SHA256

    0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79

    SHA512

    7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2

  • memory/944-10-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp

    Filesize

    10.8MB

  • memory/944-11-0x0000000002AD0000-0x0000000002AE0000-memory.dmp

    Filesize

    64KB

  • memory/944-12-0x000000001BEB0000-0x000000001BF00000-memory.dmp

    Filesize

    320KB

  • memory/944-13-0x000000001BFC0000-0x000000001C072000-memory.dmp

    Filesize

    712KB

  • memory/944-14-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp

    Filesize

    10.8MB

  • memory/944-15-0x0000000002AD0000-0x0000000002AE0000-memory.dmp

    Filesize

    64KB

  • memory/1248-0-0x00000000008C0000-0x0000000000C08000-memory.dmp

    Filesize

    3.3MB

  • memory/1248-1-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp

    Filesize

    10.8MB

  • memory/1248-2-0x000000001B870000-0x000000001B880000-memory.dmp

    Filesize

    64KB

  • memory/1248-9-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp

    Filesize

    10.8MB