Analysis

  • max time kernel
    151s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/05/2023, 01:06

General

  • Target

    25d7952b3e8c9f0872ecf4f099cea1a2.exe

  • Size

    47KB

  • MD5

    25d7952b3e8c9f0872ecf4f099cea1a2

  • SHA1

    976e307d3fc015452e70acd29ebddef0d8823fac

  • SHA256

    7fb468df5b46d1eb0f26e737c515a5a10794b84c9193628efb71c9c32fe8edc1

  • SHA512

    f81102833efd450be231d238f3065cf3d5cb9ae6c60f0a4e6b057ffd4c78a2767b0fd8aff54e0bb08ebdf5b5da293f622e68c4874776f0fa25adfd639ca4f3eb

  • SSDEEP

    768:sJCO9ILoeck+riPUl5kJN/QisVF8YbWgTgDaJivEgK/JDqVc6KN:sJ588kqFzbJga4nkJDqVclN

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

dom45x.duckdns.org:62180

Mutex

DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    true

  • install_file

    Runtime Broker.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Async RAT payload 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 10 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\25d7952b3e8c9f0872ecf4f099cea1a2.exe
    "C:\Users\Admin\AppData\Local\Temp\25d7952b3e8c9f0872ecf4f099cea1a2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4584
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Runtime Broker" /tr '"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3652
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "Runtime Broker" /tr '"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:3840
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9E48.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4860
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:2540
      • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
        "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4052

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Temp\tmp9E48.tmp.bat

          Filesize

          158B

          MD5

          0a61c60c5d21e9fec07bff93a322200f

          SHA1

          8e48a2f8f59ea183da6581e18b2715d0a7d4b9cf

          SHA256

          3dfc56440f0409f9fe2c4752ca80efba1144b5d2da80b02e1c74f181e8ad654d

          SHA512

          40e6b76589d2cd23817bc1493397c72edfb1846fa64725637ddd1c828448eda22ff89628091f1d01b7af6a3858815abf91f5994f50ff4893cf355f7a8cc57be4

        • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe

          Filesize

          47KB

          MD5

          25d7952b3e8c9f0872ecf4f099cea1a2

          SHA1

          976e307d3fc015452e70acd29ebddef0d8823fac

          SHA256

          7fb468df5b46d1eb0f26e737c515a5a10794b84c9193628efb71c9c32fe8edc1

          SHA512

          f81102833efd450be231d238f3065cf3d5cb9ae6c60f0a4e6b057ffd4c78a2767b0fd8aff54e0bb08ebdf5b5da293f622e68c4874776f0fa25adfd639ca4f3eb

        • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe

          Filesize

          47KB

          MD5

          25d7952b3e8c9f0872ecf4f099cea1a2

          SHA1

          976e307d3fc015452e70acd29ebddef0d8823fac

          SHA256

          7fb468df5b46d1eb0f26e737c515a5a10794b84c9193628efb71c9c32fe8edc1

          SHA512

          f81102833efd450be231d238f3065cf3d5cb9ae6c60f0a4e6b057ffd4c78a2767b0fd8aff54e0bb08ebdf5b5da293f622e68c4874776f0fa25adfd639ca4f3eb

        • memory/4052-143-0x000000001B9E0000-0x000000001B9F0000-memory.dmp

          Filesize

          64KB

        • memory/4052-144-0x000000001B9E0000-0x000000001B9F0000-memory.dmp

          Filesize

          64KB

        • memory/4584-133-0x00000000001D0000-0x00000000001E2000-memory.dmp

          Filesize

          72KB

        • memory/4584-134-0x000000001AE70000-0x000000001AE80000-memory.dmp

          Filesize

          64KB