Analysis

  • max time kernel
    91s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/04/2023, 03:48

General

  • Target

    AsyncClient.exe

  • Size

    47KB

  • MD5

    05db410247a5899d2784c9d79a7e9f7a

  • SHA1

    9be286a04858d149eee48e4cb4f3e73ea5c5c2b8

  • SHA256

    211b91753a7aa02a6ab3a2fafdd350c4c82870b8982fdecfe4f18ef0fcfa277b

  • SHA512

    730325ce9cb5553c9e208ab34db04efde78c38ddea36a6d13bd47fb54fd0bc973d51604b0c03e83464c4f6dbb301d90cca835a98d457e2e5d56cf8ef65d0254d

  • SSDEEP

    768:eu/6ZTgoiziWUUM9rmo2qrAcazlaQPIX1XVrbOi0bGf9omSH8M6AaQLczGdBDZgx:eu/6ZTgle2W9XFRUbGfe3laQLcazdgx

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

127.0.0.1:61288

146.70.165.10:61288

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • delay

    3

  • install

    false

  • 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).

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 25 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4708
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\kbukxp.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2304
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\kbukxp.exe"'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3836
        • C:\Users\Admin\AppData\Local\Temp\kbukxp.exe
          "C:\Users\Admin\AppData\Local\Temp\kbukxp.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:404
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8F25.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3776
      • C:\Windows\SysWOW64\timeout.exe
        timeout 2
        3⤵
        • Delays execution with timeout.exe
        PID:2848

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mrytyxg5.fka.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

          Filesize

          47KB

          MD5

          05db410247a5899d2784c9d79a7e9f7a

          SHA1

          9be286a04858d149eee48e4cb4f3e73ea5c5c2b8

          SHA256

          211b91753a7aa02a6ab3a2fafdd350c4c82870b8982fdecfe4f18ef0fcfa277b

          SHA512

          730325ce9cb5553c9e208ab34db04efde78c38ddea36a6d13bd47fb54fd0bc973d51604b0c03e83464c4f6dbb301d90cca835a98d457e2e5d56cf8ef65d0254d

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

          Filesize

          47KB

          MD5

          05db410247a5899d2784c9d79a7e9f7a

          SHA1

          9be286a04858d149eee48e4cb4f3e73ea5c5c2b8

          SHA256

          211b91753a7aa02a6ab3a2fafdd350c4c82870b8982fdecfe4f18ef0fcfa277b

          SHA512

          730325ce9cb5553c9e208ab34db04efde78c38ddea36a6d13bd47fb54fd0bc973d51604b0c03e83464c4f6dbb301d90cca835a98d457e2e5d56cf8ef65d0254d

        • C:\Users\Admin\AppData\Local\Temp\tmp8F25.tmp.bat

          Filesize

          163B

          MD5

          2ef77f4dcd456d76af721b9b69a3a7d2

          SHA1

          34391cb02820681decb287c4b04075c61665e8f8

          SHA256

          ae4f4b44729ea269e263db938365ea8bba403e812066d91519dcc3ac6132038e

          SHA512

          18fa71d26bc5e9c24429de6a7eed66c63fe411a44279d81928e4fc4f55e088241227faebef4c33bb5e12747d07a9241fb233662395f79a5452c7c194370ade4d

        • memory/404-173-0x0000000006B70000-0x0000000006C02000-memory.dmp

          Filesize

          584KB

        • memory/404-172-0x0000000004EF0000-0x0000000004F00000-memory.dmp

          Filesize

          64KB

        • memory/404-171-0x0000000004EF0000-0x0000000004F00000-memory.dmp

          Filesize

          64KB

        • memory/3836-165-0x0000000005F80000-0x0000000005FA2000-memory.dmp

          Filesize

          136KB

        • memory/3836-163-0x0000000005FB0000-0x0000000006046000-memory.dmp

          Filesize

          600KB

        • memory/3836-148-0x0000000004B20000-0x0000000005148000-memory.dmp

          Filesize

          6.2MB

        • memory/3836-149-0x0000000005220000-0x0000000005242000-memory.dmp

          Filesize

          136KB

        • memory/3836-166-0x0000000002110000-0x0000000002120000-memory.dmp

          Filesize

          64KB

        • memory/3836-155-0x0000000005340000-0x00000000053A6000-memory.dmp

          Filesize

          408KB

        • memory/3836-160-0x0000000002110000-0x0000000002120000-memory.dmp

          Filesize

          64KB

        • memory/3836-161-0x0000000002110000-0x0000000002120000-memory.dmp

          Filesize

          64KB

        • memory/3836-162-0x0000000005A40000-0x0000000005A5E000-memory.dmp

          Filesize

          120KB

        • memory/3836-147-0x00000000044B0000-0x00000000044E6000-memory.dmp

          Filesize

          216KB

        • memory/3836-164-0x0000000005F30000-0x0000000005F4A000-memory.dmp

          Filesize

          104KB

        • memory/4708-133-0x0000000000F70000-0x0000000000F82000-memory.dmp

          Filesize

          72KB

        • memory/4708-141-0x0000000007260000-0x000000000727E000-memory.dmp

          Filesize

          120KB

        • memory/4708-140-0x0000000007290000-0x0000000007306000-memory.dmp

          Filesize

          472KB

        • memory/4708-139-0x0000000006260000-0x00000000062C6000-memory.dmp

          Filesize

          408KB

        • memory/4708-138-0x00000000067A0000-0x0000000006D44000-memory.dmp

          Filesize

          5.6MB

        • memory/4708-137-0x0000000006150000-0x00000000061EC000-memory.dmp

          Filesize

          624KB

        • memory/4708-134-0x00000000059E0000-0x00000000059F0000-memory.dmp

          Filesize

          64KB