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Analysis

  • max time kernel
    150s
  • max time network
    139s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    29/01/2025, 17:20

General

  • Target

    ScreenSync.exe

  • Size

    3.1MB

  • MD5

    30fbaed202420d9498bdb13c9693d80e

  • SHA1

    b38397ae8616f9776fb2af4c64691c4b63a26e7b

  • SHA256

    a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead

  • SHA512

    9ff1f624174a90b4aeb648f11a92fd3baa5fd1f9c70f6ef5a9c55338fae83d8427206ae514fb9acae0156f1e6dfc2c0472be591ab7ff1fa0a6119edbd55b6f3d

  • SSDEEP

    49152:2vBt62XlaSFNWPjljiFa2RoUYIzp5rbR4jLoGdlTHHB72eh2NT:2vr62XlaSFNWPjljiFXRoUYIzp5mv

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Leo

C2

192.168.0.17:4200

Mutex

c93cab56-a846-47c9-8b65-82599c60a04c

Attributes
  • encryption_key

    9D84316EB0C7F33BAF79572A6CB80DCB88C8D3CF

  • install_name

    ScreenSync.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    system32.exe

  • subdirectory

    drivers

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 3 IoCs
  • Drops file in Drivers directory 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Scheduled Task/Job: Scheduled Task 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 9 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\ScreenSync.exe
    "C:\Users\Admin\AppData\Local\Temp\ScreenSync.exe"
    1⤵
    • Drops file in Drivers directory
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1992
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "system32.exe" /sc ONLOGON /tr "C:\Windows\system32\drivers\ScreenSync.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2356
    • C:\Windows\system32\drivers\ScreenSync.exe
      "C:\Windows\system32\drivers\ScreenSync.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2396
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "system32.exe" /sc ONLOGON /tr "C:\Windows\system32\drivers\ScreenSync.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2108

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\drivers\ScreenSync.exe

    Filesize

    3.1MB

    MD5

    30fbaed202420d9498bdb13c9693d80e

    SHA1

    b38397ae8616f9776fb2af4c64691c4b63a26e7b

    SHA256

    a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead

    SHA512

    9ff1f624174a90b4aeb648f11a92fd3baa5fd1f9c70f6ef5a9c55338fae83d8427206ae514fb9acae0156f1e6dfc2c0472be591ab7ff1fa0a6119edbd55b6f3d

  • memory/1992-0-0x000007FEF5283000-0x000007FEF5284000-memory.dmp

    Filesize

    4KB

  • memory/1992-1-0x0000000000040000-0x0000000000364000-memory.dmp

    Filesize

    3.1MB

  • memory/1992-2-0x000007FEF5280000-0x000007FEF5C6C000-memory.dmp

    Filesize

    9.9MB

  • memory/1992-8-0x000007FEF5280000-0x000007FEF5C6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2396-9-0x00000000013A0000-0x00000000016C4000-memory.dmp

    Filesize

    3.1MB

  • memory/2396-10-0x000007FEF5280000-0x000007FEF5C6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2396-11-0x000007FEF5280000-0x000007FEF5C6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2396-12-0x000007FEF5280000-0x000007FEF5C6C000-memory.dmp

    Filesize

    9.9MB