Analysis

  • max time kernel
    117s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    01-12-2023 10:30

General

  • Target

    client-2.exe

  • Size

    3.1MB

  • MD5

    cac610eeae60d8291a852ad9dda90c81

  • SHA1

    d97afeabdc465c60ba040becfbc5abde19ec9326

  • SHA256

    7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4

  • SHA512

    887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

  • SSDEEP

    49152:uvct62XlaSFNWPjljiFa2RoUYIy6RJ6LbR3LoGduTHHB72eh2NT:uvg62XlaSFNWPjljiFXRoUYIy6RJ6d

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

127.0.0.1:7777

Mutex

e74501e4-0d13-44ea-ab56-f5adb400d53b

Attributes
  • encryption_key

    122EFF89481AC09109CB9613ECDFDD3EE770EBD3

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    300000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 4 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 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\client-2.exe
    "C:\Users\Admin\AppData\Local\Temp\client-2.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2696
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2624
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2728
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2432

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    cac610eeae60d8291a852ad9dda90c81

    SHA1

    d97afeabdc465c60ba040becfbc5abde19ec9326

    SHA256

    7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4

    SHA512

    887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

  • C:\Windows\system32\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    cac610eeae60d8291a852ad9dda90c81

    SHA1

    d97afeabdc465c60ba040becfbc5abde19ec9326

    SHA256

    7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4

    SHA512

    887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

  • memory/2696-0-0x0000000001250000-0x0000000001574000-memory.dmp

    Filesize

    3.1MB

  • memory/2696-1-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2696-2-0x0000000000260000-0x00000000002E0000-memory.dmp

    Filesize

    512KB

  • memory/2696-8-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2728-7-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2728-9-0x00000000003B0000-0x00000000006D4000-memory.dmp

    Filesize

    3.1MB

  • memory/2728-10-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

    Filesize

    9.9MB

  • memory/2728-11-0x000000001B600000-0x000000001B680000-memory.dmp

    Filesize

    512KB