Analysis

  • max time kernel
    144s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/04/2023, 20:23

General

  • Target

    Client.exe

  • Size

    47KB

  • MD5

    ba749e000163c81a53234fcb21cdd2ee

  • SHA1

    1650d6019a972f647ad8b58bab7648bd9311cc02

  • SHA256

    f510b0b4cc33d862c3b1d9b35ee76563cf3044e5d85009d27a46177ab4332b7d

  • SHA512

    91bb51faf1a3ba3ed3e2ee963642da71df3c9c4ffd4502142407fac1cc99f29fa33b0c73abf50f3e1f095252efbfc9fde6a35fece6002349f25c28837583f5d7

  • SSDEEP

    768:gbERqILEWgg+jiltelDSN+iV08Ybyge3Tg/Rvu9vEgK/JrZVc6KN:cEgIltKDs4zb1AwJu9nkJrZVclN

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

Mutex

DcRatMutex_qwqdanchun

Attributes
  • delay

    2

  • install

    true

  • install_file

    app.exe

  • install_folder

    %Temp%

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\Client.exe
    "C:\Users\Admin\AppData\Local\Temp\Client.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3280
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "app" /tr '"C:\Users\Admin\AppData\Local\Temp\app.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1556
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "app" /tr '"C:\Users\Admin\AppData\Local\Temp\app.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:3392
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCA79.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1512
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:32
      • C:\Users\Admin\AppData\Local\Temp\app.exe
        "C:\Users\Admin\AppData\Local\Temp\app.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4248

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Temp\app.exe

          Filesize

          47KB

          MD5

          ba749e000163c81a53234fcb21cdd2ee

          SHA1

          1650d6019a972f647ad8b58bab7648bd9311cc02

          SHA256

          f510b0b4cc33d862c3b1d9b35ee76563cf3044e5d85009d27a46177ab4332b7d

          SHA512

          91bb51faf1a3ba3ed3e2ee963642da71df3c9c4ffd4502142407fac1cc99f29fa33b0c73abf50f3e1f095252efbfc9fde6a35fece6002349f25c28837583f5d7

        • C:\Users\Admin\AppData\Local\Temp\app.exe

          Filesize

          47KB

          MD5

          ba749e000163c81a53234fcb21cdd2ee

          SHA1

          1650d6019a972f647ad8b58bab7648bd9311cc02

          SHA256

          f510b0b4cc33d862c3b1d9b35ee76563cf3044e5d85009d27a46177ab4332b7d

          SHA512

          91bb51faf1a3ba3ed3e2ee963642da71df3c9c4ffd4502142407fac1cc99f29fa33b0c73abf50f3e1f095252efbfc9fde6a35fece6002349f25c28837583f5d7

        • C:\Users\Admin\AppData\Local\Temp\tmpCA79.tmp.bat

          Filesize

          150B

          MD5

          cafae8c8ce10f629eb6c1bebd16af8d6

          SHA1

          d9bd95052291908cc25662424956b43c3de5f783

          SHA256

          eae0e843390e926757e8628bbc344e33ab9409d11dd6f67a6e081a2bd65d1edf

          SHA512

          edfd4c30d696fcc90695c9b2d576a7a440c34bbd19d0e6007f309d67fbdf035fb58e03002578d27de49ad1c265191b28cd8ece6aba59d64ccd0fe6935033751c

        • memory/3280-133-0x0000000000960000-0x0000000000972000-memory.dmp

          Filesize

          72KB

        • memory/3280-134-0x000000001B650000-0x000000001B660000-memory.dmp

          Filesize

          64KB

        • memory/4248-143-0x000000001CEE0000-0x000000001CEF0000-memory.dmp

          Filesize

          64KB

        • memory/4248-144-0x000000001CEE0000-0x000000001CEF0000-memory.dmp

          Filesize

          64KB