Analysis

  • max time kernel
    149s
  • max time network
    136s
  • platform
    windows7_x64
  • resource
    win7-20240705-en
  • resource tags

    arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
  • submitted
    01-08-2024 02:03

General

  • Target

    BootstrapperV1.11.exe

  • Size

    3.1MB

  • MD5

    f9da53f4f072c15dbf78b015a10575a2

  • SHA1

    96ea78662e9f44d6b4dcbbdc05bb4026188697ff

  • SHA256

    dd37983f893fe6aec0c2721e910896122de0549306fbc60277c3adf8a991bd0c

  • SHA512

    be39c735e3aa3a361b3ad2fd766182df0fa2dabbb50c3793f8d92d3c5ee1243d0111e2b40f47a2a68ab0a4e107bb50e411281b6d91fb4a17d0dfb8dd761dfa6f

  • SSDEEP

    49152:2vHY52fyaSZOrPWluWBuGG5g5hYPV8mC9QoGErqTHHB72eh2NT:2v452fyaSZOrPWluWBDG5g5hYPVBq

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.2.0.2:4782

Mutex

cc6f57e2-b224-4b7b-bfae-0b1e6f95f22f

Attributes
  • encryption_key

    48E15FD52A3A24CE1F767DA2AD76CB0B862CC879

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Solara

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 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\BootstrapperV1.11.exe
    "C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.11.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2720
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2724
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2700
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2748

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    f9da53f4f072c15dbf78b015a10575a2

    SHA1

    96ea78662e9f44d6b4dcbbdc05bb4026188697ff

    SHA256

    dd37983f893fe6aec0c2721e910896122de0549306fbc60277c3adf8a991bd0c

    SHA512

    be39c735e3aa3a361b3ad2fd766182df0fa2dabbb50c3793f8d92d3c5ee1243d0111e2b40f47a2a68ab0a4e107bb50e411281b6d91fb4a17d0dfb8dd761dfa6f

  • memory/2700-9-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

    Filesize

    9.9MB

  • memory/2700-8-0x0000000001160000-0x0000000001484000-memory.dmp

    Filesize

    3.1MB

  • memory/2700-10-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

    Filesize

    9.9MB

  • memory/2700-11-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

    Filesize

    9.9MB

  • memory/2720-0-0x000007FEF5AC3000-0x000007FEF5AC4000-memory.dmp

    Filesize

    4KB

  • memory/2720-1-0x00000000013D0000-0x00000000016F4000-memory.dmp

    Filesize

    3.1MB

  • memory/2720-2-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

    Filesize

    9.9MB

  • memory/2720-7-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

    Filesize

    9.9MB