Analysis

  • max time kernel
    150s
  • max time network
    149s
  • 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, 18:44

General

  • Target

    AsyncClient.exe

  • Size

    45KB

  • MD5

    dcfb73959b8a575a7f5765bb0723a861

  • SHA1

    b9757ac469bc18714e7c138094bd461707ff80c5

  • SHA256

    afbe39d83050f54ca4cdaca312b52475f70389dd7f906653c5869f4db914c85a

  • SHA512

    c2f4a52227ae66263266c41d7cd5823c0ded669fddec194b1c5f47d8be95851dd359da887a60f9d8a7e7a63f17f4e95e24e4ea7a1ee087925a7bbdad04f43090

  • SSDEEP

    768:3uyRNTAoZjRWUJs9bmo2qL7KjGKG6PIyzjbFgX3i+ETtzcHmjBEgmyBDZzx:3uyRNTAGo2WKYDy3bCXS+camjBndzx

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

181.ip.ply.gg:5050

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • delay

    3

  • install

    true

  • install_file

    svchost.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).

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • 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 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 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 behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1504
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4560
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:112
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp886E.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3208
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:228
      • C:\Users\Admin\AppData\Roaming\svchost.exe
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:316
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /4
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:2344

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\tmp886E.tmp.bat

          Filesize

          151B

          MD5

          55d99e37d985f57a6b617a061662d995

          SHA1

          a7830d44aed87d273b3fb402af4f5710d7bbb431

          SHA256

          2b1052390765720d932ea5c92a47cfe8d194e5c9681928e178299bee0848980e

          SHA512

          bb017e06a706947f013fd3c21426e87846affdc999382919aac73b8b22f7fdf4c3e55e7ac6181e85001938fe70972b501b8ca5aa3ffe59078efb629359a479d1

        • C:\Users\Admin\AppData\Roaming\svchost.exe

          Filesize

          45KB

          MD5

          dcfb73959b8a575a7f5765bb0723a861

          SHA1

          b9757ac469bc18714e7c138094bd461707ff80c5

          SHA256

          afbe39d83050f54ca4cdaca312b52475f70389dd7f906653c5869f4db914c85a

          SHA512

          c2f4a52227ae66263266c41d7cd5823c0ded669fddec194b1c5f47d8be95851dd359da887a60f9d8a7e7a63f17f4e95e24e4ea7a1ee087925a7bbdad04f43090

        • C:\Users\Admin\AppData\Roaming\svchost.exe

          Filesize

          45KB

          MD5

          dcfb73959b8a575a7f5765bb0723a861

          SHA1

          b9757ac469bc18714e7c138094bd461707ff80c5

          SHA256

          afbe39d83050f54ca4cdaca312b52475f70389dd7f906653c5869f4db914c85a

          SHA512

          c2f4a52227ae66263266c41d7cd5823c0ded669fddec194b1c5f47d8be95851dd359da887a60f9d8a7e7a63f17f4e95e24e4ea7a1ee087925a7bbdad04f43090

        • memory/1504-133-0x0000000000B30000-0x0000000000B42000-memory.dmp

          Filesize

          72KB

        • memory/1504-134-0x00000000055C0000-0x00000000055D0000-memory.dmp

          Filesize

          64KB

        • memory/1504-135-0x00000000055D0000-0x000000000566C000-memory.dmp

          Filesize

          624KB

        • memory/2344-146-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-145-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-144-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-150-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-151-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-152-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-153-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-154-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-156-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB

        • memory/2344-155-0x0000015D8CE90000-0x0000015D8CE91000-memory.dmp

          Filesize

          4KB