Analysis

  • max time kernel
    125s
  • max time network
    135s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    15-12-2024 18:54

General

  • Target

    MultiTool.exe

  • Size

    3.1MB

  • MD5

    4b7479abac927b19a8b495e323cfb583

  • SHA1

    c8b5e498dcbc8eba2c551634c75cbd2a55444ef3

  • SHA256

    8e57548613e26bf0e7bed5a240dacb93e2bc28f9df50fb5bfe3251fe534e85f0

  • SHA512

    faa1bf133c8928920374a31dedfdaf6ed73df57e2b0af6d01cc6000b5be6a86e82dc3181efb52f32bc8952bc868e51c359ea7b70daa277030b45879369a1d915

  • SSDEEP

    49152:bvzlL26AaNeWgPhlmVqvMQ7XSK8xac1J3hoGdHqTHHB72eh2NT:bvpL26AaNeWgPhlmVqkQ7XSK8xaq3

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.19:4782

Mutex

cbd5bb11-a5b0-4dee-8e4b-bb4f3dacc71d

Attributes
  • encryption_key

    17F9A06104A1A84BB74B1E617E0D5896149A2953

  • install_name

    ThunderClientExternal.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • 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\MultiTool.exe
    "C:\Users\Admin\AppData\Local\Temp\MultiTool.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2268
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2792
    • C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2908
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2876

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    4b7479abac927b19a8b495e323cfb583

    SHA1

    c8b5e498dcbc8eba2c551634c75cbd2a55444ef3

    SHA256

    8e57548613e26bf0e7bed5a240dacb93e2bc28f9df50fb5bfe3251fe534e85f0

    SHA512

    faa1bf133c8928920374a31dedfdaf6ed73df57e2b0af6d01cc6000b5be6a86e82dc3181efb52f32bc8952bc868e51c359ea7b70daa277030b45879369a1d915

  • memory/2268-0-0x000007FEF5753000-0x000007FEF5754000-memory.dmp

    Filesize

    4KB

  • memory/2268-1-0x0000000000A40000-0x0000000000D64000-memory.dmp

    Filesize

    3.1MB

  • memory/2268-2-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

    Filesize

    9.9MB

  • memory/2268-11-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

    Filesize

    9.9MB

  • memory/2908-8-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

    Filesize

    9.9MB

  • memory/2908-9-0x00000000012F0000-0x0000000001614000-memory.dmp

    Filesize

    3.1MB

  • memory/2908-10-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

    Filesize

    9.9MB

  • memory/2908-12-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

    Filesize

    9.9MB